x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
MODF(3) Linux Programmer's Manual MODF(3)
NAME
modf, modff, modfl - extract signed integral and fractional values from
floating-point number
SYNOPSIS
#include <math.h>
double modf(double x, double *iptr);
float modff(float x, float *iptr);
long double modfl(long double x, long double *iptr);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
modf(), modfl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
DESCRIPTION
The modf() function breaks the argument x into an integral part and a
fractional part, each of which has the same sign as x. The integral
part is stored in the location pointed to by iptr.
RETURN VALUE
The modf() function returns the fractional part of x.
If x is a NaN, a NaN is returned, and *iptr is set to a NaN.
If x is positive infinity (negative infinity), +0 (-0) is returned, and
*iptr is set to positive infinity (negative infinity).
ERRORS
No errors occur.
ATTRIBUTES
Multithreading (see pthreads(7))
The modf(), modff(), and modfl() functions are thread-safe.
CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4,
4.3BSD, C89.
SEE ALSO
frexp(3), ldexp(3)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
2013-06-21 MODF(3)
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