{"id":5256,"date":"2022-12-20T18:37:15","date_gmt":"2022-12-20T21:37:15","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/fmod-man3p\/"},"modified":"2022-12-20T18:37:15","modified_gmt":"2022-12-20T21:37:15","slug":"fmod-man3p","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/fmod-man3p\/","title":{"rendered":"FMOD (man3p)"},"content":{"rendered":"

FMOD<\/h1>\n

PROLOG<\/a>
NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
RETURN VALUE<\/a>
ERRORS<\/a>
EXAMPLES<\/a>
APPLICATION USAGE<\/a>
RATIONALE<\/a>
FUTURE DIRECTIONS<\/a>
SEE ALSO<\/a>
COPYRIGHT<\/a> <\/p>\n

\n

PROLOG <\/a> <\/h2>\n

This manual page is part of the POSIX Programmer\u2019s 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.<\/p>\n

NAME <\/a> <\/h2>\n

fmod, fmodf, fmodl \u2014 floating-point remainder value function<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

#include <\/p>\n

double fmod(double x<\/i>, double y<\/i>);
float fmodf(float x<\/i>, float y<\/i>);
long double fmodl(long double x<\/i>, long double y<\/i>);<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

The functionality described on this reference page is aligned with the ISO\u00a0C standard. Any conflict between the requirements described here and the ISO\u00a0C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO\u00a0C standard.<\/p>\n

These functions shall return the floating-point remainder of the division of x<\/i> by y<\/i>.<\/p>\n

An application wishing to check for error situations should set errno<\/i> to zero and call feclearexcept<\/i>(FE_ALL_EXCEPT) before calling these functions. On return, if errno<\/i> is non-zero or fetestexcept<\/i>(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.<\/p>\n

RETURN VALUE <\/a> <\/h2>\n

These functions shall return the value x<\/i>\u2212i<\/i>*y<\/i>, for some integer i<\/i> such that, if y<\/i> is non-zero, the result has the same sign as x<\/i> and magnitude less than the magnitude of y<\/i>.<\/p>\n

If the correct value would cause underflow, and is not representable, a range error may occur, and fmod<\/i>(), modf<\/i>(), and fmodl<\/i>() shall return 0.0, or (if the IEC 60559 Floating-Point option is not supported) an implementation-defined value no greater in magnitude than DBL_MIN, FLT_MIN, and LDBL_MIN, respectively.<\/p>\n

If x<\/i> or y<\/i> is NaN, a NaN shall be returned, and none of the conditions below shall be considered.<\/p>\n

If y<\/i> is zero, a domain error shall occur, and a NaN shall be returned.<\/p>\n

If x<\/i> is infinite, a domain error shall occur, and a NaN shall be returned.<\/p>\n

If x<\/i> is \u00b10 and y<\/i> is not zero, \u00b10 shall be returned.<\/p>\n

If x<\/i> is not infinite and y<\/i> is \u00b1Inf, x<\/i> shall be returned.<\/p>\n

If the correct value would cause underflow, and is representable, a range error may occur and the correct value shall be returned.<\/p>\n

ERRORS <\/a> <\/h2>\n

These functions shall fail if:
Domain\u00a0Error<\/p>\n

The x<\/i> argument is infinite or y<\/i> is zero.<\/p>\n

If the integer expression (math_errhandling<\/i> & MATH_ERRNO) is non-zero, then errno<\/i> shall be set to [EDOM]<\/b>. If the integer expression (math_errhandling<\/i> & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be raised.<\/p>\n

These functions may fail if:<\/p>\n\n\n
<\/td>\n\n

Range\u00a0Error<\/p>\n<\/td>\n

<\/td>\n\n

The result underflows.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

If the integer expression (math_errhandling<\/i> & MATH_ERRNO) is non-zero, then errno<\/i> shall be set to [ERANGE]<\/b>. If the integer expression (math_errhandling<\/i> & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised.<\/p>\n

The following sections are informative.<\/i><\/p>\n

EXAMPLES <\/a> <\/h2>\n

None.<\/p>\n

APPLICATION USAGE <\/a> <\/h2>\n

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

RATIONALE <\/a> <\/h2>\n

None.<\/p>\n

FUTURE DIRECTIONS <\/a> <\/h2>\n

None.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

feclearexcept<\/i>(), fetestexcept<\/i>(), isnan<\/i>()<\/p>\n

Section 4.20<\/i>, Treatment of Error Conditions for Mathematical Functions<\/i>, <\/b><\/p>\n

COPYRIGHT <\/a> <\/h2>\n

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 .<\/p>\n

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 .<\/p>\n

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