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REMAINDER(3) FreeBSD Library Functions Manual REMAINDER(3)
NAME
remainder, remainderf, remainderl, remquo, remquof, remquol - minimal
residue functions
LIBRARY
Math Library (libm, -lm)
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), ieee(3), math(3)
STANDARDS
The remainder(), remainderf(), remainderl(), remquo(), remquof(), and
remquol() routines conform to ISO/IEC 9899:1999 ("ISO C99"). The
remainder is as defined in IEEE Std 754-1985.
HISTORY
The remainder() and remainderf() functions appeared in 4.3BSD 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.
FreeBSD 14.0-RELEASE-p11 March 30, 2008 FreeBSD 14.0-RELEASE-p11