NAME

fmod − floating-point remainder value function

SYNOPSIS

cc [ flag ... ] file ... −lm [ library ... ]

#include <math.h>

double fmod(double x, double y);

DESCRIPTION

The fmod() function returns the floating-point remainder of the division of x by y.

RETURN VALUES

The fmod() function returns the value x − i ∗ y, for some integer i such that, if y is non-zero, the result has the same sign as x and magnitude less than the magnitude of y.

If x or y is NaN, NaN is returned. 

If y is 0, NaN is returned and errno is set to EDOM. 

If x is ±Inf, NaN is returned. 

If y is non-zero, fmod(±0,y) returns the value of x. If x is not ±Inf, fmod(x,±Inf) returns the value of x.

ERRORS

The fmod() function may fail if:

EDOM y is 0. 

No other errors will occur. 

USAGE

Portable applications should not call fmod() with y equal to 0, because the result is implementation-dependent.  The application should verify y is non-zero before calling fmod(). 

An application wishing to check for error situations should set errno to 0 before calling fmod().  If errno is non-zero on return, or the return value is NaN, an error has occurred. 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

SEE ALSO

isnan(3M), attributes(5)

SunOS 5.6  —  Last change: 29 Dec 1996