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

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ drem(), dremf(), dreml(), remainder(), remainderf(), remainderl()           │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       Before glibc 2.15, the call

           remainder(nan(""), 0);

       returned a NaN, as expected, but wrongly caused a domain error.  Since glibc 2.15, a silent NaN (i.e., no
       domain error) is returned.

       Before glibc 2.15, errno was not set to EDOM for the domain error that occurs when x is an infinity and y
       is not a NaN.

       These  functions  compute  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 the absolute value of x-n*y is 0.5, n is  chosen  to  be
       even.

       These functions are unaffected by the current rounding mode (see fenv(3)).

       The drem() function does precisely the same thing.

       See  math_error(7)  for  information on how to determine whether an error has occurred when calling these
       functions.

       The following errors can occur:

       Domain error: x is an infinity and y is not a NaN
              errno is set to EDOM (but see BUGS).  An invalid floating-point exception (FE_INVALID) is raised.

              These functions do not set errno for this case.

       Domain error: y is zero
              errno is set to EDOM.  An invalid floating-point exception (FE_INVALID) is raised.

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

remainder()
       remainderf()
       remainderl()
              C99, POSIX.1-2001.

       drem() 4.3BSD.

       dremf()
       dreml()
              Tru64, glibc2.

       Math library (libm, -lm)

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

       On success, these functions return the floating-point remainder, x-n*y.  If the return value is 0, it has
       the sign of x.

       If x or y is a NaN, a NaN is returned.

       If x is an infinity, and y is not a NaN, a domain error occurs, and a NaN is returned.

       If y is zero, and x is not a NaN, a domain error occurs, and a NaN is returned.

div(3), fmod(3), remquo(3)

Linux man-pages 6.9.1                              2024-05-02                                       remainder(3)

remainder()
       remainderf()
       remainderl()
              C11, POSIX.1-2008.

       drem()
       dremf()
       dreml()
              None.

#include<math.h>doubleremainder(doublex,doubley);floatremainderf(floatx,floaty);longdoubleremainderl(longdoublex,longdoubley);

       /* Obsolete synonyms */
       [[deprecated]]doubledrem(doublex,doubley);[[deprecated]]floatdremf(floatx,floaty);[[deprecated]]longdoubledreml(longdoublex,longdoubley);

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

       remainder():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || _XOPEN_SOURCE >= 500
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

       remainderf(), remainderl():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

       drem(), dremf(), dreml():
           /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE