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.