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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;
Parameter Values
- 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[10];
int i = 0;
void setup() {}
void loop() {
values[i] = analogRead(0);
i = (i + 1) % 10; // remainder operator rolls over variable
}
※ NOTES AND WARNINGS:
- The remainder operator does not work on floats.
- 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.
See Also
- Language : + (addition)
- Language : = (assignment operator)
- Language : / (division)
- Language : * (multiplication)
- Language : - (subtraction)
※ ARDUINO BUY RECOMMENDATION
| Arduino UNO R3 | |
| Arduino Starter Kit |
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