FREXP man page on Archlinux

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FREXP(3P)		   POSIX Programmer's Manual		     FREXP(3P)

       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.

       frexp, frexpf, frexpl — extract mantissa and  exponent  from  a	double
       precision number

       #include <math.h>

       double frexp(double num, int *exp);
       float frexpf(float num, int *exp);
       long double frexpl(long double num, int *exp);

       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 a floating-point number num into a  normal‐
       ized fraction and an integral power of 2. The integer exponent shall be
       stored in the int object pointed to by exp.

       For finite arguments, these functions shall return the  value  x,  such
       that  x	has  a	magnitude in the interval [½,1) or 0, and num equals x
       times 2 raised to the power *exp.

       If num is NaN, a NaN shall be  returned,	 and  the  value  of  *exp  is

       If num is ±0, ±0 shall be returned, and the value of *exp shall be 0.

       If num is ±Inf, num shall be returned, and the value of *exp is unspec‐

       No errors are defined.

       The following sections are informative.





       isnan(), ldexp(), modf()

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

       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 Electri‐
       cal 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 .

       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.ker‐ .

IEEE/The Open Group		     2013			     FREXP(3P)

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