IEEE Std 1003.1-2008

Copyright © 2001-2008 The IEEE and The Open Group

remainder, remainderf, remainderl - remainder function

#include <math.h>

double remainder(doublex, doubley);

float remainderf(floatx, floaty);

long double remainderl(long doublex, long doubley);

^{[CX]}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 floating-point remainder

r=x-nywhenyis non-zero. The valuenis the integral value nearest the exact valuex/y. When |n-x/y|=½, the valuenis chosen to be even.The behavior of

remainder() shall be independent of the rounding mode.

Upon successful completion, these functions shall return the floating-point remainder

r=x-nywhenyis non-zero.On systems that do not support the IEC 60559 Floating-Point option, if

yis zero, it is implementation-defined whether a domain error occurs or zero is returned.

^{[MX]}Ifxoryis NaN, a NaN shall be returned.If

xis infinite oryis 0 and the other is non-NaN, a domain error shall occur, and either a NaN (if supported), or an implementation-defined value shall be returned.

These functions shall fail if:

- Domain Error
^{[MX]}Thexargument is ±Inf, or theyargument is ±0 and the other argument is non-NaN.If the integer expression (

math_errhandling& MATH_ERRNO) is non-zero, thenerrnoshall 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
yargument is zero.If the integer expression (

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

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 non-zero.

None.

None.

abs,div,feclearexcept,fetestexcept,ldivXBD

Treatment of Error Conditions for Mathematical Functions,<math.h>

First released in Issue 4, Version 2.

Moved from X/OPEN UNIX extension to BASE.

The

remainder() function is no longer marked as an extension.The

remainderf() andremainderl() functions are added for alignment with the ISO/IEC 9899:1999 standard.The DESCRIPTION, RETURN VALUE, ERRORS, and APPLICATION USAGE sections are revised to align with the ISO/IEC 9899:1999 standard.

IEC 60559:1989 standard floating-point extensions over the ISO/IEC 9899:1999 standard are marked.

ISO/IEC 9899:1999 standard, Technical Corrigendum 2 #55 (SD5-XSH-ERN-82) is applied.

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