| /* | |
| String constructors | |
| Examples of how to create Strings from other data types | |
| created 27 Jul 2010 | |
| modified 30 Aug 2011 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/StringConstructors | |
| */ | |
| void setup() { | |
| // Open serial communications and wait for port to open: | |
| Serial.begin(9600); | |
| while (!Serial) { | |
| ; // wait for serial port to connect. Needed for native USB port only | |
| } | |
| // send an intro: | |
| Serial.println("\n\nString Constructors:"); | |
| Serial.println(); | |
| } | |
| void loop() { | |
| // using a constant String: | |
| String stringOne = "Hello String"; | |
| Serial.println(stringOne); // prints "Hello String" | |
| // converting a constant char into a String: | |
| stringOne = String('a'); | |
| Serial.println(stringOne); // prints "a" | |
| // converting a constant string into a String object: | |
| String stringTwo = String("This is a string"); | |
| Serial.println(stringTwo); // prints "This is a string" | |
| // concatenating two strings: | |
| stringOne = String(stringTwo + " with more"); | |
| // prints "This is a string with more": | |
| Serial.println(stringOne); | |
| // using a constant integer: | |
| stringOne = String(13); | |
| Serial.println(stringOne); // prints "13" | |
| // using an int and a base: | |
| stringOne = String(analogRead(A0), DEC); | |
| // prints "453" or whatever the value of analogRead(A0) is | |
| Serial.println(stringOne); | |
| // using an int and a base (hexadecimal): | |
| stringOne = String(45, HEX); | |
| // prints "2d", which is the hexadecimal version of decimal 45: | |
| Serial.println(stringOne); | |
| // using an int and a base (binary) | |
| stringOne = String(255, BIN); | |
| // prints "11111111" which is the binary value of 255 | |
| Serial.println(stringOne); | |
| // using a long and a base: | |
| stringOne = String(millis(), DEC); | |
| // prints "123456" or whatever the value of millis() is: | |
| Serial.println(stringOne); | |
| // using a float and the right decimal places: | |
| stringOne = String(5.698, 3); | |
| Serial.println(stringOne); | |
| // using a float and less decimal places to use rounding: | |
| stringOne = String(5.698, 2); | |
| Serial.println(stringOne); | |
| // do nothing while true: | |
| while (true); | |
| } | |