fmod(3)

NAME

fmod, fmodf, fmodl — floating-point remainder functions

SYNOPSIS

/* -lm */
#include <math.h>

double
fmod(double x, double y);

float
fmodf(float x, float y);

long double
fmodl(long double x, long double y);

DESCRIPTION

The fmod() function computes the floating-point remainder of x/y. The fmodf() function is a single precision version of fmod(). The fmodl() function is an extended precision version of fmod().

RETURN VALUES

The fmod(), fmodf() and fmodl() functions return 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 y is zero, whether a domain error occurs or the fmod() function returns zero is implementation-defined.

SEE ALSO

remainder(3)

STANDARDS

The fmod() function conforms to ANSI X3.159-1989 (“ANSI C89”).

HISTORY

An fmod() function first appeared in Version 5 AT&T UNIX.