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# fmod

Floating-point remainder function
View other versions (4)

## Interface

`#include <math.h>double fmod (double x, double y)long fmodl (long double x, long double y)float fmodf (float x, float y)`

## Description

The fmod functions compute the floating-point remainder of dividing x by y.

The return value is x - n y, where n is the quotient of x / y, rounded to the first integer towards zero.

Example:
##### Example - Floating-point remainder function
Workings
```#include <stdio.h>
#include <math.h>
int main(void)
{
double x = 2*3.1415926 + 0.14527, y = 3.1415926;
printf("fmod(x, y) = %.5lf\n", fmod(x, y));
return 0;
}```
Solution
Output:
`fmod(x, y) = 0.14527`

## Special Values

fmod ( ±0, y ) returns ±0 for y not zero.

fmod ( x, y ) returns a NaN and raises the invalid floating-point exception for x infinite or y zero.

fmod ( x, ±∞ ) returns x for x not infinite.

reference:frexp, reference:modf

## Standards

The fmod functions conform to ISO/IEC 9899:1999(E).