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Linux 2.6 - man page for modff (linux section 3)

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(), modl(): _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.
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 3.27 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2010-09-20 MODF(3)


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