modff(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
   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

   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).

   ┌─────────────────────────┬───────────────┬─────────┐
   │InterfaceAttributeValue   │
   ├─────────────────────────┼───────────────┼─────────┤
   │modf(), modff(), modfl() │ 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 4.09 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/.

                              2016-03-15                           MODF(3)





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