1FREXP(P)                   POSIX Programmer's Manual                  FREXP(P)
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NAME

6       frexp,  frexpf,  frexpl  -  extract mantissa and exponent from a double
7       precision number
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SYNOPSIS

10       #include <math.h>
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12       double frexp(double num, int *exp);
13       float frexpf(float num, int *exp);
14       long double frexpl(long double num, int *exp);
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DESCRIPTION

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

23       For finite arguments, these functions shall return the  value  x,  such
24       that  x  has a magnitude in the interval [0.5,1) or 0, and num equals x
25       times 2 raised to the power *exp.
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27       If num is NaN, a NaN shall be  returned,  and  the  value  of  *exp  is
28       unspecified.
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30       If num is ±0, ±0 shall be returned, and the value of *exp shall be 0.
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32       If num is ±Inf, num shall be returned, and the value of *exp is unspec‐
33       ified.
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ERRORS

36       No errors are defined.
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38       The following sections are informative.
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EXAMPLES

41       None.
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APPLICATION USAGE

44       None.
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RATIONALE

47       None.
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FUTURE DIRECTIONS

50       None.
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SEE ALSO

53       isnan()  ,  ldexp()  ,  modf()  ,  the  Base  Definitions   volume   of
54       IEEE Std 1003.1-2001, <math.h>
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57       Portions  of  this text are reprinted and reproduced in electronic form
58       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
59       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
60       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
61       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
62       event of any discrepancy between this version and the original IEEE and
63       The  Open Group Standard, the original IEEE and The Open Group Standard
64       is the referee document. The original Standard can be  obtained  online
65       at http://www.opengroup.org/unix/online.html .
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69IEEE/The Open Group                  2003                             FREXP(P)
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