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65 lines
2.0 KiB
Plaintext
65 lines
2.0 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "COPYSIGN" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" copysign
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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copysign, copysignf, copysignl \- number manipulation function
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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 copysign(double\fP \fIx\fP\fB, double\fP \fIy\fP\fB);
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.br
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float copysignf(float\fP \fIx\fP\fB, float\fP \fIy\fP\fB);
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.br
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long double copysignl(long double\fP \fIx\fP\fB, long double\fP \fIy\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 produce a value with the magnitude of \fIx\fP
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and the sign of \fIy\fP. On implementations that represent
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a signed zero but do not treat negative zero consistently in arithmetic
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operations, these functions regard the sign of zero as
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positive.
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.SH RETURN VALUE
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.LP
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Upon successful completion, these functions shall return a value with
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the magnitude of \fIx\fP and the sign of \fIy\fP.
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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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\fIsignbit\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
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\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 .
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