redhat man page for fmod

FMOD(3) 						     Linux Programmer's Manual							   FMOD(3)

NAME
       fmod - floating-point remainder function

SYNOPSIS
       #include <math.h>

       double fmod(double x, double y);

DESCRIPTION
       The  fmod()  function  computes the remainder of dividing x by y.  The return value is x - n * y, where n is the quotient of x / y, rounded
       towards zero to an integer.

RETURN VALUE
       The fmod() function returns the remainder, unless y is zero, when the function fails and errno is set.

ERRORS
       EDOM   The denominator y is zero.

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       drem(3)

								    1993-06-06								   FMOD(3)