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FMOD
Section: Linux Programmer's Manual (3)
Updated: 2010-09-20
Index
Return to Main Contents
NAME
fmod, fmodf, fmodl - floating-point remainder function
SYNOPSIS
#include <math.h>
double fmod(double x, double y);
float fmodf(float x, float y);
long double fmodl(long double x, long double y);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
fmodf(),
fmodl():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The
fmod()
function computes the floating-point remainder of dividing x by
y.
The return value is x - n * y, where n
is the quotient of x / y, rounded towards zero to an integer.
RETURN VALUE
On success, these
functions return the value x - n*y,
for some integer n,
such that the returned value has the same sign as
x
and a magnitude less than the magnitude of
y.
If
x
or
y
is a NaN, a NaN is returned.
If
x
is an infinity,
a domain error occurs, and
a NaN is returned.
If
y
is zero,
a domain error occurs, and
a NaN is returned.
If
x
is +0 (-0), and
y
is not zero, +0 (-0) is returned.
ERRORS
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
-
errno
is set to
EDOM
(but see BUGS).
An invalid floating-point exception
(FE_INVALID)
is raised.
- Domain error: y is zero
-
errno
is set to
EDOM.
An invalid floating-point exception
(FE_INVALID)
is raised.
BUGS
Before version 2.10, the glibc implementation did not set
errno
to
EDOM
when a domain error occurred for an infinite
x.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
remainder(3)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- BUGS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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