MODF
Section: Linux Programmer's Manual (3)
Updated: 2013-06-21
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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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- Multithreading (see pthreads(7))
-
- CONFORMING TO
-
- SEE ALSO
-
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