Modulo / Remainder in Arduino

The modulo operator in Arduino is exactly the same as in C language, or most other languages for that matter. The operator is %. The syntax is: a % b and it returns the remainder when a is divided by b.

Example

The following example illustrates the use of this operator −

void setup() {
   // put your setup code here, to run once:
   Serial.begin(9600);
   Serial.println();

   Serial.println(10%3);
   Serial.println(4%2);
   Serial.println(50%9);
}
void loop() {
   // put your main code here, to run repeatedly:
}

Output

The Serial Monitor output is shown below. You can work out the remainders yourself and verify that the output is correct.