MODF(3) manual page
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modf, modff, modfl - extract signed
integral and fractional values from floating-point number
#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
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.
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).
No errors occur.
The modf(), modff(), and modfl() functions are thread-safe.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD,
C89.
frexp(3)
, ldexp(3)
This page is part of release 3.78
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/.
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