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break
Description
break is used to exit from a for, while or do...while loop, bypassing the normal loop condition. It is also used to exit from a switch case statement.
Example Code
Example with For Loop
Example 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
Example 2
The following code exits the for loop when the sensor value exceeds the threshold.
int threshold = 40;
for (int x = 0; x < 255; x++) {
analogWrite(PWMpin, x);
sens = analogRead(sensorPin);
if (sens > threshold) { // bail out on sensor detect
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
See Also
- Language : continue
- Language : do...while
- Language : else
- Language : for
- Language : goto
- Language : if
- Language : return
- Language : switch...case
- Language : while
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