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# fmod, fmodf

Visual Studio 2012

Calculates the floating-point remainder.

```double fmod(
double x,
double y
);
float fmod(
float x,
float y
);  // C++ only
long double fmod(
long double x,
long double y
);  // C++ only
float fmodf(
float x,
float y
);
```
x, y

Floating-point values.

fmod returns the floating-point remainder of x / y. If the value of y is 0.0, fmod returns a quiet NaN. For information about representation of a quiet NaN by the printf family, see printf.

The fmod function calculates the floating-point remainder f of x / y such that x = i * y + f, where i is an integer, f has the same sign as x, and the absolute value of f is less than the absolute value of y.

C++ allows overloading, so you can call overloads of fmod. In a C program, fmod always takes two doubles and returns a double.

Function

fmod , fmodf

<math.h>

For additional compatibility information, see Compatibility in the Introduction.

```// crt_fmod.c
// This program displays a floating-point remainder.

#include <math.h>
#include <stdio.h>

int main( void )
{
double w = -10.0, x = 3.0, z;

z = fmod( w, x );
printf( "The remainder of %.2f / %.2f is %f\n", w, x, z );
}
```
`The remainder of -10.00 / 3.00 is -1.000000`