| /* |
| Appending to Strings using the += operator and concat() |
| |
| Examples of how to append different data types to strings |
| |
| created 27 July 2010 |
| modified 2 Apr 2012 |
| by Tom Igoe |
| |
| http://arduino.cc/en/Tutorial/StringAppendOperator |
| |
| This example code is in the public domain. |
| */ |
| 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 Leonardo 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); |
| } |
| |