FMOD(3) Library Functions Manual FMOD(3)

fmod, fmodf, fmodl — floating-point remainder functions

#include <math.h>

double
fmod(double x, double y);

float
fmodf(float x, float y);

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

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

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.

remainder(3)

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

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

June 29, 2021 OpenBSD 7.6