REMAINDER(3)

NAME
remainder, remainderf, remainderl, remquo, remquof, remquol, drem, dremf - minimal residue functions

SYNOPSIS
#include <math.h>
double
remainder(double x, double y);
float
remainderf(float x, float y);
long double
remainderl(long double x, long double y);
double
remquo(double x, double y, int *quo);
float
remquof(float x, float y, int *quo);
long double
remquol(long double x, long double y, int *quo);

DESCRIPTION
remainder(), remainderf(), remainderl(), remquo(), remquof(), and remquol() return the remainder r := x - n*y where n is the integer nearest the exact value of x/y; moreover if | n - x/y | = 1/2 then n is even. Consequently the remainder is computed exactly and | r | ≤ | y |/2. But attempting to take the remainder when y is 0 or x is ±infinity is an invalid operation that produces a NaN.

The remquo(), remquof() and remquol() functions also store the last k bits of n in the location pointed to by quo, provided that n exists. The number of bits k is platform-specific, but is guaranteed to be at least 3.

SEE ALSO
fmod(3), nextafter(3)

STANDARDS
The remainder(), remainderf(), remainderl(), remquo(), remquof(), and remquol() routines conform to isoC-99. The remainder is as defined in ieee754.

drem() and dremf() are deprecated aliases for remainder() and remainderf(), respectively.

HISTORY
The remainder() and remainderf() functions appeared in 4.3BSD and NetBSD 1.2, respectively. The remquo() and remquof() functions were added in OpenBSD 4.4.