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REMAINDER(3)               Linux Programmer's Manual              REMAINDER(3)



NAME
       drem,  dremf, dreml, remainder, remainderf, remainderl - floating-point
       remainder function

SYNOPSIS
       #include <&lt;math.h>&gt;

       /* The C99 versions */
       double remainder(double x, double y);
       float remainderf(float x, float y);
       long double remainderl(long double x, long double y);

       /* Obsolete synonyms */
       double drem(double x, double y);
       float dremf(float x, float y);
       long double dreml(long double x, long double y);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       remainder(), remainderf(), remainderl(): _SVID_SOURCE || _BSD_SOURCE ||
       _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
       drem(), dremf(), dreml(): _SVID_SOURCE || _BSD_SOURCE

DESCRIPTION
       The  remainder()  function  computes  the remainder of dividing x by y.
       The return value is x - n * y, where n is the value x / y,  rounded  to
       the nearest integer.  If this quotient is 1/2 (mod 1), it is rounded to
       the nearest even number (independent of the current rounding mode).  If
       the return value is 0, it has the sign of x.

       The drem() function does precisely the same thing.

RETURN VALUE
       The  remainder() function returns the remainder, unless y is zero, when
       the function fails and errno is set.

ERRORS
       EDOM   The denominator y is zero.

CONFORMING TO
       IEC 60559.  The functions remainder(), remainderf(),  and  remainderl()
       are from C99.

       The function drem() is from 4.3BSD.  The float and long double variants
       dremf() and dreml() exist on some systems, such as  Tru64  and  glibc2.
       Avoid the use of these functions in favor of remainder() etc.

EXAMPLE
       The call "remainder(29.0, 3.0)" returns -1.

SEE ALSO
       fmod(3), remquo(3)

COLOPHON
       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



                                  2008-06-16                      REMAINDER(3)