task_url stringlengths 30 116 | task_name stringlengths 2 86 | task_description stringlengths 0 14.4k | language_url stringlengths 2 53 | language_name stringlengths 1 52 | code stringlengths 0 61.9k |
|---|---|---|---|---|---|
http://rosettacode.org/wiki/Primality_by_Wilson%27s_theorem | Primality by Wilson's theorem | Task
Write a boolean function that tells whether a given integer is prime using Wilson's theorem.
By Wilson's theorem, a number p is prime if and only if p divides (p - 1)! + 1.
Remember that 1 and all non-positive integers are not prime.
See also
Cut-the-knot: Wilson's theorem.
Wikipedia: Wilson's theorem
| #PL.2FI | PL/I | /* primality by Wilson's theorem */
wilson: procedure options( main );
declare n binary(15)fixed;
isWilsonPrime: procedure( n )returns( bit(1) );
declare n binary(15)fixed;
declare ( fmodp, i ) binary(15)fixed;
fmodp = 1;
do i = 2 to n - 1;
fmodp = mod( fmodp * i, n )... |
http://rosettacode.org/wiki/Prime_conspiracy | Prime conspiracy | A recent discovery, quoted from Quantamagazine (March 13, 2016):
Two mathematicians have uncovered a simple, previously unnoticed property of
prime numbers — those numbers that are divisible only by 1 and themselves.
Prime numbers, it seems, have decided preferences about the final digits of ... | #Racket | Racket | #lang racket
(require math/number-theory)
(define limit 1000000)
(define table
(for/fold ([table (hash)] [prev 2] #:result table)
([p (in-list (next-primes 2 (sub1 limit)))])
(define p-mod (modulo p 10))
(values (hash-update table (cons prev p-mod) add1 0) p-mod)))
(define (pair<? p q) (or... |
http://rosettacode.org/wiki/Prime_conspiracy | Prime conspiracy | A recent discovery, quoted from Quantamagazine (March 13, 2016):
Two mathematicians have uncovered a simple, previously unnoticed property of
prime numbers — those numbers that are divisible only by 1 and themselves.
Prime numbers, it seems, have decided preferences about the final digits of ... | #Raku | Raku | use Math::Primesieve;
my %conspiracy;
my $upto = 1_000_000;
my $sieve = Math::Primesieve.new;
my @primes = $sieve.n-primes($upto+1);
@primes[^($upto+1)].reduce: -> $a, $b {
my $d = $b % 10;
%conspiracy{"$a → $d count:"}++;
$d;
}
say "$_ \tfrequency: {($_.value/$upto*100).round(.01)} %" for %conspiracy... |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #Clojure | Clojure | ;;; No stack consuming algorithm
(defn factors
"Return a list of factors of N."
([n]
(factors n 2 ()))
([n k acc]
(if (= 1 n)
acc
(if (= 0 (rem n k))
(recur (quot n k) k (cons k acc))
(recur n (inc k) acc))))) |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #C.2B.2B | C++ | int* pointer2(&var); |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #COBOL | COBOL | 01 ptr USAGE POINTER TO Some-Type.
01 prog-ptr USAGE PROGRAM-POINTER "some-program". *> TO is optional |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Common_Lisp | Common Lisp | void main() {
// Take the address of 'var' and placing it in a pointer:
int var;
int* ptr = &var;
// Take the pointer to the first item of an array:
int[10] data;
auto p2 = data.ptr;
// Depending on variable type, D will automatically pass either
// by value or reference.
// By... |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #ALGOL_68 | ALGOL 68 | #!/usr/bin/algol68g-full --script #
# -*- coding: utf-8 -*- #
PR READ "prelude/errata.a68" PR;
PR READ "prelude/exception.a68" PR;
PR READ "prelude/math_lib.a68" PR;
CO REQUIRED BY "prelude/graph_2d.a68" CO
MODE GREAL= REAL; # single precision #
FORMAT greal repr = $g(-3,0)$;
PR READ "prelude/graph_2d.a68" PR;
... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #BASIC | BASIC | INSTALL @lib$ + "CLASSLIB"
REM Create parent class with void 'doprint' method:
DIM PrintableShape{doprint}
PROC_class(PrintableShape{})
REM Create derived class for Point:
DIM Point{x#, y#, setxy, retx, rety, @constructor, @@destructor}
PROC_inherit(Point{}, PrintableShape{... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #C.23 | C# | using System;
using System.Collections.Generic;
using static System.Linq.Enumerable;
public static class PokerHandAnalyzer
{
private enum Hand {
Invalid, High_Card, One_Pair, Two_Pair, Three_Of_A_Kind, Straight,
Flush, Full_House, Four_Of_A_Kind, Straight_Flush, Five_Of_A_Kind
}
private ... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #AppleScript | AppleScript | --------------------- POPULATION COUNT ---------------------
-- populationCount :: Int -> Int
on populationCount(n)
-- The number of non-zero bits in the binary
-- representation of the integer n.
script go
on |λ|(x)
if 0 < x then
Just({x mod 2, x div 2})
... |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #Common_Lisp | Common Lisp | (defun add (p1 p2)
(do ((sum '())) ((and (endp p1) (endp p2)) (nreverse sum))
(let ((pd1 (if (endp p1) -1 (caar p1)))
(pd2 (if (endp p2) -1 (caar p2))))
(multiple-value-bind (c1 c2)
(cond
((> pd1 pd2) (values (cdr (pop p1)) 0))
((< pd1 pd2) (values 0 (cdr (pop p2)))... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Elena | Elena | import extensions;
class T
{
Name = "T";
T clone() = new T();
}
class S : T
{
Name = "S";
T clone() = new S();
}
public program()
{
T original := new S();
T clone := original.clone();
console.printLine(original.Name);
console.printLine(clone.Name)
} |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #F.23 | F# | type T() =
// expose protected MemberwiseClone method (and downcast the result)
member x.Clone() = x.MemberwiseClone() :?> T
// virtual method Print with default implementation
abstract Print : unit -> unit
default x.Print() = printfn "I'm a T!"
type S() =
inherit T()
override x.Print() = printfn "I'm a... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Factor | Factor | USING: classes kernel prettyprint serialize ;
TUPLE: A ;
TUPLE: C < A ;
: serial-clone ( obj -- obj' ) object>bytes bytes>object ;
C new
[ clone ]
[ serial-clone ] bi [ class . ] bi@ |
http://rosettacode.org/wiki/Polyspiral | Polyspiral | A Polyspiral is a spiral made of multiple line segments, whereby each segment is larger (or smaller) than the previous one by a given amount. Each segment also changes direction at a given angle.
Task
Animate a series of polyspirals, by drawing a complete spiral then incrementing the angle, and (after clearing the b... | #Nim | Nim | # Pendulum simulation.
import math, random
import gintro/[gobject, gdk, gtk, gio, glib, cairo]
const
Width = 500
Height = 500
DrawIters = 72
Red = [float 1, 0, 0]
Green = [float 0, 1, 0]
Blue = [float 0, 0, 1]
Black = [float 0, 0, 0]
White = [float 255, 255, 255]
Gold = [float 255, 215, 0]
Col... |
http://rosettacode.org/wiki/Polyspiral | Polyspiral | A Polyspiral is a spiral made of multiple line segments, whereby each segment is larger (or smaller) than the previous one by a given amount. Each segment also changes direction at a given angle.
Task
Animate a series of polyspirals, by drawing a complete spiral then incrementing the angle, and (after clearing the b... | #PARI.2FGP | PARI/GP |
\\ Plot the line from x1,y1 to x2,y2.
plotline(x1,y1,x2,y2,w=0)={plotmove(w, x1,y1);plotrline(w,x2-x1,y2-y1);}
\\ Convert degrees to radians.
rad2(degs)={return(degs*Pi/180.0)}
\\ Convert Polar coordinates to Cartesian.
cartes2(r,a,rndf=0)={my(v,x,y); x=r*cos(a); y=r*sin(a);
if(rndf==0, return([x,y]), return(round(... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #D | D | import std.algorithm;
import std.range;
import std.stdio;
auto average(R)(R r) {
auto t = r.fold!("a+b", "a+1")(0, 0);
return cast(double) t[0] / t[1];
}
void polyRegression(int[] x, int[] y) {
auto n = x.length;
auto r = iota(0, n).array;
auto xm = x.average();
auto ym = y.average();
au... |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #Bracmat | Bracmat | ( ( powerset
= done todo first
. !arg:(?done.?todo)
& ( !todo:%?first ?todo
& (powerset$(!done !first.!todo),powerset$(!done.!todo))
| !done
)
)
& out$(powerset$(.1 2 3 4))
); |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #Burlesque | Burlesque |
blsq ) {1 2 3 4}R@
{{} {1} {2} {1 2} {3} {1 3} {2 3} {1 2 3} {4} {1 4} {2 4} {1 2 4} {3 4} {1 3 4} {2 3 4} {1 2 3 4}}
|
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #AWK | AWK | $ awk 'func prime(n){for(d=2;d<=sqrt(n);d++)if(!(n%d)){return 0};return 1}{print prime($1)}'
|
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #D | D | import std.stdio, std.range;
double priceRounder(in double price) pure nothrow
in {
assert(price >= 0 && price <= 1.0);
} body {
static immutable cin = [.06, .11, .16, .21, .26, .31, .36, .41,
.46, .51, .56, .61, .66, .71, .76, .81,
.86, .91, .96, 1.0... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #FreeBASIC | FreeBASIC |
' FreeBASIC v1.05.0 win64
Sub ListProperDivisors(limit As Integer)
If limit < 1 Then Return
For i As Integer = 1 To limit
Print Using "##"; i;
Print " ->";
If i = 1 Then
Print " (None)"
Continue For
End if
For j As Integer = 1 To i \ 2
If i Mod j = 0 Then Print " ... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Liberty_BASIC | Liberty BASIC |
names$="aleph beth gimel daleth he waw zayin heth"
dim sum(8)
dim counter(8)
s = 0
for i = 1 to 7
s = s+1/(i+4)
sum(i)=s
next
N =1000000 ' number of throws
for i =1 to N
rand =rnd( 1)
for j = 1 to 7
if sum(j)> rand then exit for
next
counter(j)=counter(j)+1
next
print "Obs... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #J | J | coclass 'priorityQueue'
PRI=: ''
QUE=: ''
insert=:4 :0
p=. PRI,x
q=. QUE,y
assert. p -:&$ q
assert. 1 = #$q
ord=: \: p
QUE=: ord { q
PRI=: ord { p
i.0 0
)
topN=:3 :0
assert y<:#PRI
r=. y{.QUE
PRI=: y}.PRI
QUE=: y}.QUE
r
) |
http://rosettacode.org/wiki/Problem_of_Apollonius | Problem of Apollonius |
Task
Implement a solution to the Problem of Apollonius (description on Wikipedia) which is the problem of finding the circle that is tangent to three specified circles (colored black in the diagram below to the right).
There is an algebraic solution which is pretty straightforward.
The solutions to the ... | #Scala | Scala | object ApolloniusSolver extends App {
case class Circle(x: Double, y: Double, r: Double)
object Tangent extends Enumeration {
type Tangent = Value
val intern = Value(-1)
val extern = Value(1)
}
import Tangent._
import scala.Math._
val solveApollonius: (Circle, Circle, Circle, Triple[Tangent, Tangent,... |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #UNIX_Shell | UNIX Shell | #!/bin/sh
echo "Program: $0" |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #Vala | Vala |
public static void main(string[] args){
string command_name = args[0];
stdout.printf("%s\n", command_name);
}
|
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #Ruby | Ruby | class PythagoranTriplesCounter
def initialize(limit)
@limit = limit
@total = 0
@primitives = 0
generate_triples(3, 4, 5)
end
attr_reader :total, :primitives
private
def generate_triples(a, b, c)
perim = a + b + c
return if perim > @limit
@primitives += 1
@total += @limit / ... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Retro | Retro | problem? [ bye ] if |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #REXX | REXX | /*REXX program showing five ways to perform a REXX program termination. */
/*─────1st way────────────────────────────────────────────────────────*/
exit
/*─────2nd way────────────────────────────────────────────────────────*/
exit (expression) /*Note: the "expression" doesn't need parentheses*/
... |
http://rosettacode.org/wiki/Primality_by_Wilson%27s_theorem | Primality by Wilson's theorem | Task
Write a boolean function that tells whether a given integer is prime using Wilson's theorem.
By Wilson's theorem, a number p is prime if and only if p divides (p - 1)! + 1.
Remember that 1 and all non-positive integers are not prime.
See also
Cut-the-knot: Wilson's theorem.
Wikipedia: Wilson's theorem
| #PL.2FM | PL/M | 100H: /* FIND PRIMES USING WILSON'S THEOREM: */
/* P IS PRIME IF ( ( P - 1 )! + 1 ) MOD P = 0 */
DECLARE FALSE LITERALLY '0';
BDOS: PROCEDURE( FN, ARG ); /* CP/M BDOS SYSTEM CALL */
DECLARE FN BYTE, ARG ADDRESS;
GOTO 5;
END BDOS;
P... |
http://rosettacode.org/wiki/Prime_conspiracy | Prime conspiracy | A recent discovery, quoted from Quantamagazine (March 13, 2016):
Two mathematicians have uncovered a simple, previously unnoticed property of
prime numbers — those numbers that are divisible only by 1 and themselves.
Prime numbers, it seems, have decided preferences about the final digits of ... | #REXX | REXX | /*REXX pgm shows a table of what last digit follows the previous last digit for N primes*/
parse arg N . /*N: the number of primes to be genned*/
if N=='' | N=="," then N= 1000000 /*Not specified? Then use the default.*/
Np= N+1; w= length(N-1) ... |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #Commodore_BASIC | Commodore BASIC | 9000 REM ----- function generate
9010 REM in ... i ... number
9020 REM out ... pf() ... factors
9030 REM mod ... ca ... pf candidate
9040 pf(0)=0 : ca=2 : REM special case
9050 IF i=1 THEN RETURN
9060 IF INT(i/ca)*ca=i THEN GOSUB 9200 : GOTO 9050
9070 FOR ca=3 TO INT( SQR(i)) STEP 2
9080 IF i=1 THEN RETURN
9090 IF INT(... |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #D | D | void main() {
// Take the address of 'var' and placing it in a pointer:
int var;
int* ptr = &var;
// Take the pointer to the first item of an array:
int[10] data;
auto p2 = data.ptr;
// Depending on variable type, D will automatically pass either
// by value or reference.
// By... |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Delphi | Delphi | pMyPointer : Pointer ; |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #AutoHotkey | AutoHotkey | #SingleInstance, Force
#NoEnv
SetBatchLines, -1
OnExit, Exit
FileOut := A_Desktop "\MyNewFile.png"
Font := "Arial"
x := [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
y := [2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0]
; Uncomment if Gdip.ahk is not in your standard library
; #Include, Gdip.ahk
if (!pToken := Gdip_Star... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #BBC_BASIC | BBC BASIC | INSTALL @lib$ + "CLASSLIB"
REM Create parent class with void 'doprint' method:
DIM PrintableShape{doprint}
PROC_class(PrintableShape{})
REM Create derived class for Point:
DIM Point{x#, y#, setxy, retx, rety, @constructor, @@destructor}
PROC_inherit(Point{}, PrintableShape{... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #C | C | using System;
class Point
{
protected int x, y;
public Point() : this(0) {}
public Point(int x) : this(x,0) {}
public Point(int x, int y) { this.x = x; this.y = y; }
public int X { get { return x; } set { x = value; } }
public int Y { get { return y; } set { y = value; } }
public virtual void print() { Sy... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #C.2B.2B | C++ |
#include <iostream>
#include <sstream>
#include <algorithm>
#include <vector>
using namespace std;
class poker
{
public:
poker() { face = "A23456789TJQK"; suit = "SHCD"; }
string analyze( string h )
{
memset( faceCnt, 0, 13 ); memset( suitCnt, 0, 4 ); vector<string> hand;
transform( h.begin(), h.end... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #Arturo | Arturo | popCount: function [num][
size select split to :string as.binary num 'x -> x="1"
]
print "population count for the first thirty powers of 3:"
print map 0..29 => [popCount 3^&]
print "first thirty evil numbers"
print take select 0..100 => [even? popCount &] 30
print "first thirty odious numbers"
print take sel... |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #D | D | import std.stdio, std.range, std.algorithm, std.typecons, std.conv;
Tuple!(double[], double[]) polyDiv(in double[] inN, in double[] inD)
nothrow pure @safe {
// Code smell: a function that does two things.
static int trimAndDegree(T)(ref T[] poly) nothrow pure @safe @nogc {
poly = poly.retro.find!q{ a... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Forth | Forth | include lib/memcell.4th
include 4pp/lib/foos.4pp
( a1 -- a2)
:token fork dup allocated dup (~~alloc) swap >r swap over r> smove ;
\ allocate an empty object
:: T() \ super class T
class
method: print ... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Fortran | Fortran |
!-----------------------------------------------------------------------
!Module polymorphic_copy_example_module
!-----------------------------------------------------------------------
module polymorphic_copy_example_module
implicit none
private ! all by default
public :: T,S
type, abstract :: T
con... |
http://rosettacode.org/wiki/Polyspiral | Polyspiral | A Polyspiral is a spiral made of multiple line segments, whereby each segment is larger (or smaller) than the previous one by a given amount. Each segment also changes direction at a given angle.
Task
Animate a series of polyspirals, by drawing a complete spiral then incrementing the angle, and (after clearing the b... | #Perl | Perl |
#!/usr/bin/perl
use strict; # https://rosettacode.org/wiki/Polyspiral
use warnings;
use Tk;
use List::Util qw( min );
my $size = 500;
my ($width, $height, $x, $y, $dist);
my $angleinc = 0;
my $active = 0;
my $wait = 1000 / 30;
my $radian = 90 / atan2 1, 0;
my $mw = MainWindow->new;
$mw->title( 'Polyspiral' );
m... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Emacs_Lisp | Emacs Lisp | (let ((x '(0 1 2 3 4 5 6 7 8 9 10))
(y '(1 6 17 34 57 86 121 162 209 262 321)))
(calc-eval "fit(a*x^2+b*x+c,[x],[a,b,c],[$1 $2])" nil (cons 'vec x) (cons 'vec y))) |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #C | C | #include <stdio.h>
struct node {
char *s;
struct node* prev;
};
void powerset(char **v, int n, struct node *up)
{
struct node me;
if (!n) {
putchar('[');
while (up) {
printf(" %s", up->s);
up = up->prev;
}
puts(" ]");
} else {
me.s = *v;
me.prev = up;
powerset(v + 1, n - 1, up);
powerse... |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #B | B | isprime(n) {
auto p;
if(n<2) return(0);
if(!(n%2)) return(n==2);
p=3;
while(n/p>p) {
if(!(n%p)) return(0);
p=p+2;
}
return(1);
} |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #Delphi | Delphi |
class
APPLICATION
create
make
feature
make
--Tests the price_adjusted feature.
local
i: REAL
do
create price_fraction.initialize
from
i := 5
until
i = 100
loop
io.put_string ("Given: ")
io.put_real (i / 100)
io.put_string ("%TAdjusted:")
io.put_real (price_fracti... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #Free_Pascal | Free Pascal |
Program ProperDivisors;
Uses fgl;
Type
TIntegerList = Specialize TfpgList<longint>;
Var list : TintegerList;
Function GetProperDivisors(x : longint): longint;
{this function will return the number of proper divisors
and put them in the list}
Var i : longint;
Begin
list.clear;
If x = 1 Then {by defau... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Lua | Lua | items = {}
items["aleph"] = 1/5.0
items["beth"] = 1/6.0
items["gimel"] = 1/7.0
items["daleth"] = 1/8.0
items["he"] = 1/9.0
items["waw"] = 1/10.0
items["zayin"] = 1/11.0
items["heth"] = 1759/27720
num_trials = 1000000
samples = {}
for item, _ in pairs( items ) do
samples[item] = 0
end
math.random... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #Java | Java | import java.util.PriorityQueue;
class Task implements Comparable<Task> {
final int priority;
final String name;
public Task(int p, String n) {
priority = p;
name = n;
}
public String toString() {
return priority + ", " + name;
}
public int compareTo(Task other... |
http://rosettacode.org/wiki/Problem_of_Apollonius | Problem of Apollonius |
Task
Implement a solution to the Problem of Apollonius (description on Wikipedia) which is the problem of finding the circle that is tangent to three specified circles (colored black in the diagram below to the right).
There is an algebraic solution which is pretty straightforward.
The solutions to the ... | #Sidef | Sidef | class Circle(x,y,r) {
method to_s { "Circle(#{x}, #{y}, #{r})" }
}
func solve_apollonius(c, s) {
var(c1, c2, c3) = c...;
var(s1, s2, s3) = s...;
var 𝑣11 = (2*c2.x - 2*c1.x);
var 𝑣12 = (2*c2.y - 2*c1.y);
var 𝑣13 = (c1.x**2 - c2.x**2 + c1.y**2 - c2.y**2 - c1.r**2 + c2.r**2);
var 𝑣14 ... |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #VBA | VBA | Debug.Print Application.Name |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #vbscript | vbscript |
Wscript.Echo "FullName:",Wscript.FullName
Wscript.Echo "Name:",Wscript.Name
Wscript.Echo "Path:",Wscript.Path
Wscript.Echo "ScriptFullName:",Wscript.ScriptFullName
Wscript.Echo "ScriptName:",Wscript.ScriptName
|
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #Visual_Basic | Visual Basic | appname = App.EXEName 'appname = "MyVBapp" |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #Rust | Rust | use std::thread;
fn f1 (a : u64, b : u64, c : u64, d : u64) -> u64 {
let mut primitive_count = 0;
for triangle in [[a - 2*b + 2*c, 2*a - b + 2*c, 2*a - 2*b + 3*c],
[a + 2*b + 2*c, 2*a + b + 2*c, 2*a + 2*b + 3*c],
[2*b + 2*c - a, b + 2*c - 2*a, 2*b + 3*c - 2*a]] .iter... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Ring | Ring |
for n = 1 to 10
see n + nl
if n = 5 exit ok
next
|
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Ruby | Ruby | if problem
exit(1)
end
# or
if problem
abort # equivalent to exit(1)
end |
http://rosettacode.org/wiki/Primality_by_Wilson%27s_theorem | Primality by Wilson's theorem | Task
Write a boolean function that tells whether a given integer is prime using Wilson's theorem.
By Wilson's theorem, a number p is prime if and only if p divides (p - 1)! + 1.
Remember that 1 and all non-positive integers are not prime.
See also
Cut-the-knot: Wilson's theorem.
Wikipedia: Wilson's theorem
| #Polyglot:PL.2FI_and_PL.2FM | Polyglot:PL/I and PL/M | /* PRIMALITY BY WILSON'S THEOREM */
wilson_100H: procedure options (main);
/* PL/I DEFINITIONS */
%include 'pg.inc';
/* PL/M DEFINITIONS: CP/M BDOS SYSTEM CALL AND CONSOLE I/O ROUTINES, ETC. */ /*
DECLAR... |
http://rosettacode.org/wiki/Primality_by_Wilson%27s_theorem | Primality by Wilson's theorem | Task
Write a boolean function that tells whether a given integer is prime using Wilson's theorem.
By Wilson's theorem, a number p is prime if and only if p divides (p - 1)! + 1.
Remember that 1 and all non-positive integers are not prime.
See also
Cut-the-knot: Wilson's theorem.
Wikipedia: Wilson's theorem
| #Python | Python | from math import factorial
def is_wprime(n):
return n == 2 or (
n > 1
and n % 2 != 0
and (factorial(n - 1) + 1) % n == 0
)
if __name__ == '__main__':
c = int(input('Enter upper limit: '))
print(f'Primes under {c}:')
print([n for n in range(c) if is_wprime(n)]) |
http://rosettacode.org/wiki/Prime_conspiracy | Prime conspiracy | A recent discovery, quoted from Quantamagazine (March 13, 2016):
Two mathematicians have uncovered a simple, previously unnoticed property of
prime numbers — those numbers that are divisible only by 1 and themselves.
Prime numbers, it seems, have decided preferences about the final digits of ... | #Ruby | Ruby | require "prime"
def prime_conspiracy(m)
conspiracy = Hash.new(0)
Prime.take(m).map{|n| n%10}.each_cons(2){|a,b| conspiracy[[a,b]] += 1}
puts "#{m} first primes. Transitions prime % 10 → next-prime % 10."
conspiracy.sort.each do |(a,b),v|
puts "%d → %d count:%10d frequency:%7.4f %" % [a, b, v, 100.0*v/m]
... |
http://rosettacode.org/wiki/Prime_conspiracy | Prime conspiracy | A recent discovery, quoted from Quantamagazine (March 13, 2016):
Two mathematicians have uncovered a simple, previously unnoticed property of
prime numbers — those numbers that are divisible only by 1 and themselves.
Prime numbers, it seems, have decided preferences about the final digits of ... | #Rust | Rust | // main.rs
mod bit_array;
mod prime_sieve;
use prime_sieve::PrimeSieve;
// See https://en.wikipedia.org/wiki/Prime_number_theorem#Approximations_for_the_nth_prime_number
fn upper_bound_for_nth_prime(n: usize) -> usize {
let x = n as f64;
(x * (x.ln() + x.ln().ln())) as usize
}
fn compute_transitions(limit... |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #Common_Lisp | Common Lisp | ;;; Recursive algorithm
(defun factor (n)
"Return a list of factors of N."
(when (> n 1)
(loop with max-d = (isqrt n)
for d = 2 then (if (evenp d) (+ d 1) (+ d 2)) do
(cond ((> d max-d) (return (list n))) ; n is prime
((zerop (rem n d)) (return (cons d (factor (truncate n d))))))))) |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #E | E | var x := 0
def slot := &x # define "slot" to be x's slot
x := 1 # direct assignment; value is now 1
slot.put(2) # via slot object; value is now 2
|
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #EchoLisp | EchoLisp |
(define B (box 42))
→ B ;; box reference
(unbox B)
→ 42 ;; box contents
;; sets new value for box contents
(define ( change-by-ref abox avalue)
(set-box! abox avalue) )
(change-by-ref B 666)
→ #[box 666]
(unbox B)
→ 666
|
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Forth | Forth | variable myvar \ stores 1 cell
fvariable myfvar \ stores 1 floating point number (often 8 bytes)
2variable my2var \ stores 2 cells
|
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #BBC_BASIC | BBC BASIC | DIM x(9), y(9)
x() = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
y() = 2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0
ORIGIN 100,100
VDU 23,23,2;0;0;0;
VDU 5
FOR x = 1 TO 9
GCOL 7 : LINE 100*x,720,100*x,0
GCOL 0 : PLOT 0,-10,-4 :... |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #C | C | #include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <plot.h>
#define NP 10
double x[NP] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
double y[NP] = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0};
void minmax(double *x, double *y,
double *minx, double *maxx,
double *miny, double *maxy, ... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #C.23 | C# | using System;
class Point
{
protected int x, y;
public Point() : this(0) {}
public Point(int x) : this(x,0) {}
public Point(int x, int y) { this.x = x; this.y = y; }
public int X { get { return x; } set { x = value; } }
public int Y { get { return y; } set { y = value; } }
public virtual void print() { Sy... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #Clojure | Clojure | (defn rank [card]
(let [[fst _] card]
(if (Character/isDigit fst)
(Integer/valueOf (str fst))
({\T 10, \J 11, \Q 12, \K 13, \A 14} fst))))
(defn suit [card]
(let [[_ snd] card]
(str snd)))
(defn n-of-a-kind [hand n]
(not (empty? (filter #(= true %) (map #(>= % n) (vals (frequencies (map ra... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #AutoHotkey | AutoHotkey | Loop, 30
Out1 .= PopCount(3 ** (A_Index - 1)) " "
Loop, 60
i := A_Index - 1
, PopCount(i) & 0x1 ? Out3 .= i " " : Out2 .= i " "
MsgBox, % "3^x:`t" Out1 "`nEvil:`t" Out2 "`nOdious:`t" Out3
PopCount(x) { ;https://en.wikipedia.org/wiki/Hamming_weight#Efficient_implementation
x -= (x >> 1) & 0x5555555555555555
, x :... |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #Delphi | Delphi |
program Polynomial_long_division;
{$APPTYPE CONSOLE}
uses
System.SysUtils;
type
PPolySolution = ^TPolySolution;
TPolynomio = record
private
class function Degree(p: TPolynomio): Integer; static;
class function ShiftRight(p: TPolynomio; places: Integer): TPolynomio; static;
class function P... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Go | Go | package main
import (
"fmt"
"reflect"
)
// interface types provide polymorphism, but not inheritance.
type i interface {
identify() string
}
// "base" type
type t float64
// "derived" type. in Go terminology, it is simply a struct with an
// anonymous field. fields and methods of anonymous fields ... |
http://rosettacode.org/wiki/Polyspiral | Polyspiral | A Polyspiral is a spiral made of multiple line segments, whereby each segment is larger (or smaller) than the previous one by a given amount. Each segment also changes direction at a given angle.
Task
Animate a series of polyspirals, by drawing a complete spiral then incrementing the angle, and (after clearing the b... | #Phix | Phix | --
-- demo\rosetta\Polyspiral.exw
-- ===========================
--
-- Space toggles the timer, '+' increases speed (up to 100 FPS), '-' decreases speed
-- 'M' toggles "mod360", which inverts the angle every 360/2PI or so, since sin/cos
-- accept arguments in radians not degrees (and mod 2*PI changes nothing), produci... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Fortran | Fortran | module fitting
contains
function polyfit(vx, vy, d)
implicit none
integer, intent(in) :: d
integer, parameter :: dp = selected_real_kind(15, 307)
real(dp), dimension(d+1) :: polyfit
real(dp), dimension(:), intent(in) :: vx, vy
real(dp), ... |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #C.23 | C# |
public IEnumerable<IEnumerable<T>> GetPowerSet<T>(List<T> list)
{
return from m in Enumerable.Range(0, 1 << list.Count)
select
from i in Enumerable.Range(0, list.Count)
where (m & (1 << i)) != 0
select list[i];
}
public void Pow... |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #BASIC | BASIC | FUNCTION prime% (n!)
STATIC i AS INTEGER
IF n = 2 THEN
prime = 1
ELSEIF n <= 1 OR n MOD 2 = 0 THEN
prime = 0
ELSE
prime = 1
FOR i = 3 TO INT(SQR(n)) STEP 2
IF n MOD i = 0 THEN
prime = 0
EXIT FUNCTION
END IF
NEXT i
END IF
END FUNCTION
' Test and display primes ... |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #Eiffel | Eiffel |
class
APPLICATION
create
make
feature
make
--Tests the price_adjusted feature.
local
i: REAL
do
create price_fraction.initialize
from
i := 5
until
i = 100
loop
io.put_string ("Given: ")
io.put_real (i / 100)
io.put_string ("%TAdjusted:")
io.put_real (price_fracti... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #Frink | Frink |
for n = 1 to 10
println["$n\t" + join[" ", properDivisors[n]]]
println[]
d = new dict
for n = 1 to 20000
{
c = length[properDivisors[n]]
d.addToList[c, n]
}
most = max[keys[d]]
println[d@most + " have $most factors"]
properDivisors[n] := allFactors[n, true, false, true]
|
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Mathematica.2FWolfram_Language | Mathematica/Wolfram Language | choices={{"aleph", 1/5},{"beth", 1/6},{"gimel", 1/7},{"daleth", 1/8},{"he", 1/9},{"waw", 1/10},{"zayin", 1/11},{"heth", 1759/27720}};
data=RandomChoice[choices[[All,2]]->choices[[All,1]],10^6]; |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #MATLAB | MATLAB | function probChoice
choices = {'aleph' 'beth' 'gimel' 'daleth' 'he' 'waw' 'zayin' 'heth'};
w = [1/5 1/6 1/7 1/8 1/9 1/10 1/11 1759/27720];
R = randsample(length(w), 1e6, true, w);
T = tabulate(R);
fprintf('Value\tCount\tPercent\tGoal\n')
for k = 1:size(T, 1)
fprintf('%6s\t%.f\t%.2f%%\t%.... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #jq | jq | # In the following, pq stands for "priority queue".
# Add an item with the given priority (an integer,
# or a string representing an integer)
# Input: a pq
def pq_add(priority; item):
(priority|tostring) as $p
| if .priorities|index($p) then
if (.[$p] | index(item)) then . else .[$p] += [item] end
els... |
http://rosettacode.org/wiki/Problem_of_Apollonius | Problem of Apollonius |
Task
Implement a solution to the Problem of Apollonius (description on Wikipedia) which is the problem of finding the circle that is tangent to three specified circles (colored black in the diagram below to the right).
There is an algebraic solution which is pretty straightforward.
The solutions to the ... | #Swift | Swift | import Foundation
struct Circle {
let center:[Double]!
let radius:Double!
init(center:[Double], radius:Double) {
self.center = center
self.radius = radius
}
func toString() -> String {
return "Circle[x=\(center[0]),y=\(center[1]),r=\(radius)]"
}
}
func solveApollo... |
http://rosettacode.org/wiki/Problem_of_Apollonius | Problem of Apollonius |
Task
Implement a solution to the Problem of Apollonius (description on Wikipedia) which is the problem of finding the circle that is tangent to three specified circles (colored black in the diagram below to the right).
There is an algebraic solution which is pretty straightforward.
The solutions to the ... | #Tcl | Tcl | package require TclOO; # Just so we can make a circle class
oo::class create circle {
variable X Y Radius
constructor {x y radius} {
namespace import ::tcl::mathfunc::double
set X [double $x]; set Y [double $y]; set Radius [double $radius]
}
method values {} {list $X $Y $Radius}
method format {}... |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #Wren | Wren | import "os" for Process
System.print("My name is %(Process.allArguments[1])") |
http://rosettacode.org/wiki/Program_name | Program name | The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)
Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal A... | #x86_Assembly | x86 Assembly | FORMAT=-f elf
RUN=./
BIN=scriptname
OBJ=scriptname.o
all: test
test: $(BIN)
$(RUN)$(BIN)
$(BIN): $(OBJ)
ld -o $(BIN) $(OBJ)
$(OBJ): scriptname.asm
nasm $(FORMAT) -o $(OBJ) scriptname.asm
clean:
-rm $(BIN)
-rm $(OBJ) |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #Scala | Scala | object PythagoreanTriples extends App {
println(" Limit Primatives All")
for {e <- 2 to 7
limit = math.pow(10, e).longValue()
} {
var primCount, tripCount = 0
def parChild(a: BigInt, b: BigInt, c: BigInt): Unit = {
val perim = a + b + c
val (a2, b2, c2, c3) ... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Run_BASIC | Run BASIC | if whatever then end |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Rust | Rust | fn main() {
println!("The program is running");
return;
println!("This line won't be printed");
} |
http://rosettacode.org/wiki/Primality_by_Wilson%27s_theorem | Primality by Wilson's theorem | Task
Write a boolean function that tells whether a given integer is prime using Wilson's theorem.
By Wilson's theorem, a number p is prime if and only if p divides (p - 1)! + 1.
Remember that 1 and all non-positive integers are not prime.
See also
Cut-the-knot: Wilson's theorem.
Wikipedia: Wilson's theorem
| #Quackery | Quackery | [ 1 swap times [ i 1+ * ] ] is ! ( n --> n )
[ dup 2 < iff
[ drop false ] done
dup 1 - ! 1+
swap mod 0 = ] is prime ( n --> b )
say "Primes less than 500: "
500 times
[ i^ prime if
[ i^ echo sp ] ] |
http://rosettacode.org/wiki/Primality_by_Wilson%27s_theorem | Primality by Wilson's theorem | Task
Write a boolean function that tells whether a given integer is prime using Wilson's theorem.
By Wilson's theorem, a number p is prime if and only if p divides (p - 1)! + 1.
Remember that 1 and all non-positive integers are not prime.
See also
Cut-the-knot: Wilson's theorem.
Wikipedia: Wilson's theorem
| #Raku | Raku | sub postfix:<!> (Int $n) { (constant f = 1, |[\*] 1..*)[$n] }
sub is-wilson-prime (Int $p where * > 1) { (($p - 1)! + 1) %% $p }
# Pre initialize factorial routine (not thread safe)
9000!;
# Testing
put ' p prime?';
printf("%4d %s\n", $_, .&is-wilson-prime) for 2, 3, 9, 15, 29, 37, 47, 57, 67, 77, 87, 97, 237... |
http://rosettacode.org/wiki/Prime_conspiracy | Prime conspiracy | A recent discovery, quoted from Quantamagazine (March 13, 2016):
Two mathematicians have uncovered a simple, previously unnoticed property of
prime numbers — those numbers that are divisible only by 1 and themselves.
Prime numbers, it seems, have decided preferences about the final digits of ... | #Scala | Scala | import scala.annotation.tailrec
import scala.collection.mutable
object PrimeConspiracy extends App {
val limit = 1000000
val sieveTop = 15485863/*one millionth prime*/ + 1
val buckets = Array.ofDim[Int](10, 10)
var prevPrime = 2
def sieve(limit: Int) = {
val composite = new mutable.BitSet(sieveTop)
... |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #D | D | import std.stdio, std.bigint, std.algorithm, std.traits, std.range;
Unqual!T[] decompose(T)(in T number) pure nothrow
in {
assert(number > 1);
} body {
typeof(return) result;
Unqual!T n = number;
for (Unqual!T i = 2; n % i == 0; n /= i)
result ~= i;
for (Unqual!T i = 3; n >= i * i; i += ... |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Fortran | Fortran | real, pointer :: pointertoreal |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #FreeBASIC | FreeBASIC | ' FB 1.05.0 Win64
Type Cat
name As String
age As Integer
End Type
Type CatInfoType As Sub (As Cat Ptr)
Sub printCatInfo(c As Cat Ptr)
Print "Name "; c->name, "Age"; c-> age
Print
End Sub
' create Cat object on heap and store a pointer to it
Dim c As Cat Ptr = New Cat
' set fields using the pointer and... |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #C.2B.2B | C++ |
#include <windows.h>
#include <string>
#include <vector>
//--------------------------------------------------------------------------------------------------
using namespace std;
//--------------------------------------------------------------------------------------------------
const int HSTEP = 46, MWID = 40, M... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #C.2B.2B | C++ | #include <cstdio>
#include <cstdlib>
class Point {
protected:
int x, y;
public:
Point(int x0 = 0, int y0 = 0) : x(x0), y(y0) {}
Point(const Point &p) : x(p.x), y(p.y) {}
virtual ~Point() {}
const Point& operator=(const Point &p) {
if (this != &p) {
x = p.x;
y = p.... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #D | D | import std.stdio, std.string, std.algorithm, std.range;
string analyzeHand(in string inHand) pure /*nothrow @safe*/ {
enum handLen = 5;
static immutable face = "A23456789TJQK", suit = "SHCD";
static immutable errorMessage = "invalid hand.";
/*immutable*/ const hand = inHand.toUpper.split.sort().rele... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #AWK | AWK |
# syntax: GAWK -f POPULATION_COUNT.AWK
# converted from VBSCRIPT
BEGIN {
nmax = 30
b = 3
n = 0
bb = 1
for (i=1; i<=nmax; i++) {
list = list pop_count(bb) " "
bb *= b
}
printf("%s^n: %s\n",b,list)
for (j=0; j<=1; j++) {
c = (j == 0) ? "evil" : "odious"
i = n = 0
... |
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