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break
Description
L'instruction break est utilisée pour sortir d'une boucle do, for ou while, en passant outre le déroulement normal de la boucle. Cette instruction est également utilisée pour sortir d'une instruction switch.
Syntaxe
break;
Exemple
Example with For Loop
Exemple 1
The following code exits the for loop when the i greater than 3
void setup() {
Serial.begin(9600);
Serial.println("====== TEST START ======");
for (int i = 1; i < 1000; i++) {
Serial.print("Inside the FOR loop: i = ");
Serial.println(i);
if(i > 3)
break;
}
Serial.println("====== TEST END ========");
}
void loop() {}
The result on Serial Monitor:
COM6
====== TEST START ======
Inside the FOR loop: i = 1
Inside the FOR loop: i = 2
Inside the FOR loop: i = 3
====== TEST END ========
Autoscroll
Clear output
9600 baud
Newline
Exemple 2
for (x = 0; x < 255; x ++) // boucle for comptant x de 0 à 255
{
// mettre une impulsion de largeur x sur la broche
digitalWrite(PWMpin, x);
// lire la valeur de la tension d'un capteur sur la broche
sens = analogRead(sensorPin);
// si la mesure est supérieure à un seuil, on sort de la boucle
if (sens > threshold){
x = 0;
break; // sortie de la boucle
}
delay(50); // pause de 50ms
}
Example with While Loop
The following code exits the while loop when the i greater than 3
void setup() {
Serial.begin(9600);
Serial.println("====== TEST START ======");
int i = 0;
while (true) { // while(true) means loop forever
Serial.print("Inside the WHILE loop: i = ");
Serial.println(i);
if(i > 3)
break;
i++; // increase i by 1
}
Serial.println("====== TEST END ========");
}
void loop() {
}
The result on Serial Monitor:
COM6
====== TEST START ======
Inside the WHILE loop: i = 0
Inside the WHILE loop: i = 1
Inside the WHILE loop: i = 2
Inside the WHILE loop: i = 3
====== TEST END ========
Autoscroll
Clear output
9600 baud
Newline
Example with Do While Loop
The following code exits the while loop when the i greater than 3
void setup() {
Serial.begin(9600);
Serial.println("====== TEST START ======");
int i = 0;
do {
Serial.print("Inside the DO WHILE loop: i = ");
Serial.println(i);
if(i > 3)
break;
i++; // increase i by 1
} while (true); // while(true) means loop forever
Serial.println("====== TEST END ========");
}
void loop() {
}
The result on Serial Monitor:
COM6
====== TEST START ======
Inside the DO WHILE loop: i = 0
Inside the DO WHILE loop: i = 1
Inside the DO WHILE loop: i = 2
Inside the DO WHILE loop: i = 3
====== TEST END ========
Autoscroll
Clear output
9600 baud
Newline
Example with Switch Case
See example in switch...case
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