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arduino:arithmetic_operators:modulo

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arduino:arithmetic_operators:modulo [2013/02/15 20:45] (current)
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 +======% (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   ====
 +<code arduino>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
 +</code>
 +
 +====Example Code   ====
 +<code arduino>
 +/* 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  
 +}
 +</code>
 +
 +====Tip   ====
 +The modulo operator does not work on floats.
 +
 +====See also   ====
 +
 +* [[ Arithmetic | 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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