| /* | |
| Appending to Strings using the += operator and concat() | |
| Examples of how to append different data types to Strings | |
| created 27 Jul 2010 | |
| modified 2 Apr 2012 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/StringAppendOperator | |
| */ | |
| String stringOne, stringTwo; | |
| 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 | |
| } | |
| stringOne = String("Sensor "); | |
| stringTwo = String("value"); | |
| // send an intro: | |
| Serial.println("\n\nAppending to a String:"); | |
| Serial.println(); | |
| } | |
| void loop() { | |
| Serial.println(stringOne); // prints "Sensor " | |
| // adding a string to a String: | |
| stringOne += stringTwo; | |
| Serial.println(stringOne); // prints "Sensor value" | |
| // adding a constant string to a String: | |
| stringOne += " for input "; | |
| Serial.println(stringOne); // prints "Sensor value for input" | |
| // adding a constant character to a String: | |
| stringOne += 'A'; | |
| Serial.println(stringOne); // prints "Sensor value for input A" | |
| // adding a constant integer to a String: | |
| stringOne += 0; | |
| Serial.println(stringOne); // prints "Sensor value for input A0" | |
| // adding a constant string to a String: | |
| stringOne += ": "; | |
| Serial.println(stringOne); // prints "Sensor value for input" | |
| // adding a variable integer to a String: | |
| stringOne += analogRead(A0); | |
| Serial.println(stringOne); // prints "Sensor value for input A0: 456" or whatever analogRead(A0) is | |
| Serial.println("\n\nchanging the Strings' values"); | |
| stringOne = "A long integer: "; | |
| stringTwo = "The millis(): "; | |
| // adding a constant long integer to a String: | |
| stringOne += 123456789; | |
| Serial.println(stringOne); // prints "A long integer: 123456789" | |
| // using concat() to add a long variable to a String: | |
| stringTwo.concat(millis()); | |
| Serial.println(stringTwo); // prints "The millis(): 43534" or whatever the value of the millis() is | |
| // do nothing while true: | |
| while (true); | |
| } | |