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String opérateur +=
Description
Combine deux objets String en un seul nouvel objet String. La deuxième chaîne de caractère est accolée à la première, et le résultat est placé dans un nouvel objet String. Fonctionne de la même façon que concat()
Syntaxe
string1 += string2; // le string 1 vaut la valeur de string1 + la valeur de string 2
Paramètres
Valeurs Renvoyées
- Un nouveau String qui est la combinaison des deux Strings de départs.
Exemple
String stringOne, stringTwo;
void setup() {
Serial.begin(9600);
stringOne = String("Sensor ");
stringTwo = String("value");
Serial.println("\n\nAppending to a string:");
}
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);
}
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