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remainder, remainderf, remainderl, remquo, remquof, remquol – minimal residue functions

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO STANDARDS HISTORY

Math Library (libm, -lm)

#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);

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, Ns, /, Ns, Fa, y; moreover if |n - x, No, /, Fa, y, No, |= 1/2 then n is even. Consequently the remainder is computed exactly and |r, No, |≤ |y, No, |/2.But attempting to take the remainder when y is 0 or x is ±∞ 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.

The remainder(), remainderf(), remainderl(), remquo(), remquof(), and remquol() routines conform to ISO/IEC 9899:1999 ("ISO C99"). The remainder is as defined in -ieee754.

The remainder() and remainderf() functions appeared in BSD 4.3 and FreeBSD 2.0, respectively. The remquo() and remquof() functions were added in FreeBSD 6.0, and remainderl() and remquol() were added in FreeBSD 8.0 .