Arduino

Reference Language | Libraries | Comparison | Changes

## % (modulo)

#### Description

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

result = dividend % divisor

#### Parameters

dividend: the number to be divided

divisor: the number to divide by

#### Returns

the remainder

#### Examples

    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

#### Example Code

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

    int values[10];
    int i = 0;

    void setup() {}

    void loop()
    {
      values[i] = analogRead(0);
      i = (i + 1) % 10;   // modulo operator rolls over variable
    }

#### Tip

The modulo operator does not work on floats.

#### See also

- division

Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

### Share

### This link has expired.
Please re-subscribe to our Newsletters.

### Subscribe to our Newsletters

Email

Please enter a valid email to subscribe

Arduino Newsletter
Arduino Store Newsletter

### Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy

###### Newsletter

- ©2015 Arduino
- Copyright Notice
- Contact us
- About us
- Careers