PROLOG  NAME  SYNOPSIS  DESCRIPTION  RETURN VALUE  ERRORS  EXAMPLES  APPLICATION USAGE  RATIONALE  FUTURE DIRECTIONS  SEE ALSO  COPYRIGHT 

REMAINDER(3P) POSIX Programmer's Manual REMAINDER(3P)
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.
remainder, remainderf, remainderl — remainder function
#include <math.h> double remainder(double x, double y); float remainderf(float x, float y); long double remainderl(long double x, long double y);
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.1‐2008 defers to the ISO C standard. These functions shall return the floatingpoint remainder r=x−ny when y is nonzero. 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.
Upon successful completion, these functions shall return the floatingpoint remainder r=x−ny when y is nonzero. On systems that do not support the IEC 60559 FloatingPoint option, if y is zero, it is implementationdefined 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 nonNaN, a domain error shall occur, and a NaN shall be returned.
These functions shall fail if: Domain Error The x argument is ±Inf, or the y argument is ±0 and the other argument is nonNaN. If the integer expression (math_errhandling & MATH_ERRNO) is nonzero, then errno shall be set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is nonzero, then the invalid floatingpoint 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 nonzero, then errno shall be set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is nonzero, then the invalid floatingpoint exception shall be raised. The following sections are informative.
None.
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 nonzero.
None.
None.
abs(3p), div(3p), feclearexcept(3p), fetestexcept(3p), ldiv(3p) The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of Error Conditions for Mathematical Functions, math.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology  Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.12008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/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/manpages/reporting_bugs.html .
IEEE/The Open Group 2013 REMAINDER(3P)