DragonFly On-Line Manual Pages

REMAINDER(3)          DragonFly Library Functions Manual          REMAINDER(3)

NAME
     remainder, remainderf, remainderl, remquo, remquof, remquol -- 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 ISO/IEC 9899:1999 (``ISO C99'').  The
     remainder is as defined in IEEE Std 754-1985.

     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.

DragonFly 4.1                    July 7, 2011                    DragonFly 4.1