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.. _arduino-modulo:
% (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 <http://arduino.cc/en/Reference/Arithmetic>`_
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