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).
Parameters¶dividend: the number to be divided
divisor: the number to divide by
Returns¶The remainder of dividend/divisor.
Examples¶int x; 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
/* update one value in an array each time through a loop */
int values[10];
int i = 0;
void setup() {
// no setup necessary
}
void loop() {
values[i] = analogRead(0);
i = (i + 1) % 10; // modulo operator makes sure i stays between 0 and 9
}
Tip¶
The modulo operator does not work on floats. For that, you can use the C standard library function fmod().
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