Contents

Interface Description Special Values See Also Standards Page Comments

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 1:

#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;
}

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.

See Also

frexp, modf

Standards

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

Page Comments

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