PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME

       modf, modff, modfl — decompose a floating-point number

SYNOPSIS

       #include <math.h>

       double modf(double x, double *iptr);
       float modff(float value, float *iptr);
       long double modfl(long double value, long double *iptr);

DESCRIPTION

       The functionality described on this reference page is aligned with the ISO C standard. Any
       conflict between the requirements described here and the ISO C standard is  unintentional.
       This volume of POSIX.1‐2008 defers to the ISO C standard.

       These  functions  shall  break  the argument x into integral and fractional parts, each of
       which has the same sign as the argument. It stores the integral part as a double (for  the
       modf()  function),  a  float (for the modff() function), or a long double (for the modfl()
       function), in the object pointed to by iptr.

RETURN VALUE

       Upon successful completion, these functions shall return the signed fractional part of x.

       If x is NaN, a NaN shall be returned, and *iptr shall be set to a NaN.

       If x is ±Inf, ±0 shall be returned, and *iptr shall be set to ±Inf.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       The modf() function computes the function result and *iptr such that:

           a = modf(x, iptr) ;
           x == a+*iptr ;

       allowing for the usual floating-point inaccuracies.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       frexp(), isnan(), ldexp()

       The Base Definitions volume of POSIX.1‐2008, <math.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  In  the  event  of  any
       discrepancy  between  this  version and the original IEEE and The Open Group Standard, the
       original IEEE and The Open Group Standard is the referee document. The  original  Standard
       can be obtained online at http://www.unix.org/online.html .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .