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arduino:arithmetic_operators: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

Source: arduino.cc

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arduino/arithmetic_operators/modulo.txt · Last modified: 2013/02/15 20:45 (external edit)

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