# %

[Arithmetic Operators]

### Description

Remainder operation 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). The `%` (percent) symbol is used to carry out remainder operation.

### Syntax

`remainder = dividend % divisor;`

### Parameters

`remainder`: variable. Allowed data types: `int`, `float`, `double`.
`dividend`: variable or constant. Allowed data types: `int`.
`divisor`: non zero variable or constant. Allowed data types: `int`.

### Example Code

``````int x = 0;
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
x = -4 % 5; // x now contains -4
x = 4 % -5; // x now contains 4``````
``````/* update one value in an array each time through a loop */

int values;
int i = 0;

void setup() {}

void loop() {
2. If the first operand is negative, the result is negative (or zero). Therefore, the result of `x % 10` will not always be between 0 and 9 if `x` can be negative.