Calculates the floating-point remainder.
double fmod( double x, double y );
| Function | Required Header | Compatibility |
| fmod | <math.h> | ANSI, Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
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.
Parameters
x, y
Floating-point values
Remarks
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.
Example
/* FMOD.C: This program displays a
* floating-point remainder.
*/
#include <math.h>
#include <stdio.h>
void main( void )
{
double w = -10.0, x = 3.0, y = 0.0, z;
z = fmod( x, y );
printf( "The remainder of %.2f / %.2f is %f\n", w, x, z );
printf( "The remainder of %.2f / %.2f is %f\n", x, y, z );
}
Output
The remainder of -10.00 / 3.00 is -1.000000