FREXP(3P) POSIX Programmer's Manual FREXP(3P)
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
frexp, frexpf, frexpl - extract mantissa and exponent from a double
precision number
SYNOPSIS
#include <math.h>
double frexp(double num, int *exp);
float frexpf(float num, int *exp);
long double frexpl(long double num, int *exp);
DESCRIPTION
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.
RETURN VALUE
For finite arguments, these functions shall return the value x, such
that x has a magnitude in the interval [0.5,1) 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
unspecified.
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
unspecified.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
isnan(), ldexp(), modf(), the Base Definitions volume of
IEEE Std 1003.1-2001, <math.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 FREXP(3P)