This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       On  error,  the  expressions  (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are
       independent of each other, but at least one of them must be non-zero.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee  document.
       The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                     REMAINDER(3POSIX)

       The  functionality  described  on  this  reference  page is aligned with the ISO C standard. Any conflict
       between the requirements described  here  and  the  ISO C  standard  is  unintentional.  This  volume  of
       POSIX.1‐2017 defers to the ISO C standard.

       These  functions  shall return the floating-point remainder r=x-ny when y is non-zero. The value n is the
       integral value nearest the exact value x/y.  When |n-x/y|=½, the value n is chosen to be even.

       The behavior of remainder() shall be independent of the rounding mode.

       These functions shall fail if:

       Domain Error
                   The x argument is ±Inf, or the y argument is ±0 and the other argument is non-NaN.

                   If  the  integer  expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be
                   set to [EDOM].  If the integer expression (math_errhandling &  MATH_ERREXCEPT)  is  non-zero,
                   then the invalid floating-point exception shall be raised.

       These functions may fail if:

       Domain Error
                   The y argument is zero.

                   If  the  integer  expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be
                   set to [EDOM].  If the integer expression (math_errhandling &  MATH_ERREXCEPT)  is  non-zero,
                   then the invalid floating-point exception shall be raised.

       Thefollowingsectionsareinformative.

       None.

       None.

       remainder, remainderf, remainderl — remainder function

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

       None.

       Upon successful completion, these functions shall return the floating-point remainder r=x-ny  when  y  is
       non-zero.

       On  systems  that do not support the IEC 60559 Floating-Point option, if y is zero, it is implementation-
       defined whether a domain error occurs or zero is returned.

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

       If x is infinite or y is 0 and the other is non-NaN, a domain error shall  occur,  and  a  NaN  shall  be
       returned.

abs(), div(), feclearexcept(), fetestexcept(), ldiv()

       The Base Definitions volume of POSIX.1‐2017, Section4.20, TreatmentofErrorConditionsforMathematicalFunctions, <math.h>

       #include <math.h>

       double remainder(double x, double y);
       float remainderf(float x, float y);
       long double remainderl(long double x, long double y);