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by Francesco Paolo Lovergine
rules: linking manpages-posix not manpages. |
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved |
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by Francesco Paolo Lovergine
* Alligned to linux main manpages edition. |
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.TH "FREXP" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual" |
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by Francesco Paolo Lovergine
rules: linking manpages-posix not manpages. |
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.\" frexp |
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.SH NAME |
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frexp, frexpf, frexpl \- extract mantissa and exponent from a double
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precision number |
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.SH SYNOPSIS |
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.LP
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\fB#include <math.h>
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.br
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.sp
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double frexp(double\fP \fInum\fP\fB, int *\fP\fIexp\fP\fB); |
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.br
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float frexpf(float\fP \fInum\fP\fB, int *\fP\fIexp\fP\fB); |
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.br
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long double frexpl(long double\fP \fInum\fP\fB, int *\fP\fIexp\fP\fB); |
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.br
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\fP
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.SH DESCRIPTION |
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.LP
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These functions shall break a floating-point number \fInum\fP into |
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a normalized fraction and an integral power of 2. The |
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integer exponent shall be stored in the \fBint\fP object pointed to |
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by \fIexp\fP. |
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.SH RETURN VALUE |
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.LP
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For finite arguments, these functions shall return the value \fIx\fP, |
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such that \fIx\fP has a magnitude in the interval |
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[0.5,1) or 0, and \fInum\fP equals \fIx\fP times 2 raised to the power |
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*\fIexp\fP. |
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.LP
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If |
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\fInum\fP is NaN, a NaN shall be returned, and the value of *\fIexp\fP |
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is unspecified. |
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.LP
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If \fInum\fP is \(+-0, \(+-0 shall be returned, and the value of *\fIexp\fP |
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shall be 0. |
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.LP
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If \fInum\fP is \(+-Inf, \fInum\fP shall be returned, and the value |
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of *\fIexp\fP is unspecified. |
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.SH ERRORS |
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.LP
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No errors are defined. |
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.LP
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\fIThe following sections are informative.\fP |
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.SH EXAMPLES |
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.LP
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None. |
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.SH APPLICATION USAGE |
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.LP
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None. |
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.SH RATIONALE |
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.LP
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None. |
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.SH FUTURE DIRECTIONS |
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.LP
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None. |
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.SH SEE ALSO |
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.LP
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\fIisnan\fP() , \fIldexp\fP() , \fImodf\fP() , the |
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Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<math.h>\fP |
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.SH COPYRIGHT |
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Portions of this text are reprinted and reproduced in electronic form |
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology |
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-- Portable Operating System Interface (POSIX), The Open Group Base |
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of |
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Electrical and Electronics Engineers, Inc and The Open Group. In the |
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event of any discrepancy between this version and the original IEEE and |
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The Open Group Standard, the original IEEE and The Open Group Standard |
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is the referee document. The original Standard can be obtained online at |
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http://www.opengroup.org/unix/online.html . |