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break
Descrição
break é usado usado para sair de um laço for, while ou do...while, ignorando a condição padrão do loop. Também é usada para sair do comando switch case.
Código de Exemplo
Example with For Loop
Código de Exemplo 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
Código de Exemplo 2
No códgo seguinte, o break quebra o loop for quando o valor do sensor excede o limiar.
int lim = 40;
for (int x = 0; x < 255; x ++) {
analogWrite(PWMpin, x);
sens = analogRead(sensorPin);
if (sens > lim) { // "foge" do o loop `for`
x = 0;
break;
}
delay(50);
}
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
Ver Também
- Linguagem : continue
- Linguagem : do...while
- Linguagem : else
- Linguagem : for
- Linguagem : goto
- Linguagem : if
- Linguagem : return
- Linguagem : switch...case
- Linguagem : while
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