Modulo Operator (%) — Maple v0.0.11 Documentation

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# Modulo Operator (`%`)

Calculates the remainder when one integer is divided by another. It is useful for keeping a variable within a particular range (e.g. the size of an array).

## Syntax

    dividend % divisor

## Parameters

dividend: the number to be divided

divisor: the number to divide by

## Returns

The remainder of dividend/divisor.

## Examples

    int x;
    x = 7 % 5;   // x now contains 2
    x = 9 % 5;   // x now contains 4
    x = 5 % 5;   // x now contains 0
    x = 4 % 5;   // x now contains 4

    /* update one value in an array each time through a loop */

    int values[10];
    int i = 0;

    void setup() {
        // no setup necessary
    }

    void loop() {
      values[i] = analogRead(0);
      i = (i + 1) % 10;   // modulo operator makes sure i stays between 0 and 9
    }

## Tip

The modulo operator does not work on floats. For that, you can use the C standard library function fmod().

## See Also

- Arithmetic

License and Attribution

Portions of this page were adapted from the Arduino Reference Documentation, which is released under a Creative Commons Attribution-ShareAlike 3.0 License.

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