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man:modfl

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():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

     These functions break the argument x into an integral part and a  frac-
     tional  part,  each of which has the same sign as x.  The integral part
     is stored in the location pointed to by iptr.

RETURN VALUE

     These functions return 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

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     allbox; lbw24 lb  lb  l  l  l.   Interface Attribute Value  T{  modf(),
     modff(), modfl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.
     The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

     frexp(3), ldexp(3)

COLOPHON

     This  page  is  part of release 4.16 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
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                           MODF(3)
/data/webs/external/dokuwiki/data/pages/man/modfl.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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