modff(3)

1MODF(3)                    Linux Programmer's Manual                   MODF(3)
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NAME

6       modf, modff, modfl - extract signed integral and fractional values from
7       floating-point number
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SYNOPSIS

10       #include <math.h>
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12       double modf(double x, double *iptr);
13       float modff(float x, float *iptr);
14       long double modfl(long double x, long double *iptr);
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16       Link with -lm.
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18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20       modf(), modl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
21       _ISOC99_SOURCE; or cc -std=c99
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DESCRIPTION

24       The  modf()  function breaks the argument x into an integral part and a
25       fractional part, each of which has the same sign as  x.   The  integral
26       part is stored in the location pointed to by iptr.
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RETURN VALUE

29       The modf() function returns the fractional part of x.
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31       If x is a NaN, a NaN is returned, and *iptr is set to a NaN.
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33       If x is positive infinity (negative infinity), +0 (-0) is returned, and
34       *iptr is set to positive infinity (negative infinity).
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ERRORS

37       No errors occur.
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CONFORMING TO

40       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
41       4.3BSD, C89.
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COLOPHON

47       This  page  is  part of release 3.22 of the Linux man-pages project.  A
48       description of the project, and information about reporting  bugs,  can
49       be found at http://www.kernel.org/doc/man-pages/.
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53                                  2008-08-05                           MODF(3)