1COPYSIGN(3P)               POSIX Programmer's Manual              COPYSIGN(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       copysign, copysignf, copysignl - number manipulation function
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SYNOPSIS

15       #include <math.h>
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17       double copysign(double x, double y);
18       float copysignf(float x, float y);
19       long double copysignl(long double x, long double y);
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DESCRIPTION

23       These functions shall produce a value with the magnitude of x  and  the
24       sign  of  y. On implementations that represent a signed zero but do not
25       treat negative zero consistently in arithmetic operations, these  func‐
26       tions regard the sign of zero as positive.
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RETURN VALUE

29       Upon  successful  completion, these functions shall return a value with
30       the magnitude of x and the sign of y.
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ERRORS

33       No errors are defined.
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35       The following sections are informative.
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EXAMPLES

38       None.
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APPLICATION USAGE

41       None.
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RATIONALE

44       None.
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FUTURE DIRECTIONS

47       None.
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SEE ALSO

50       signbit(),  the  Base  Definitions  volume   of   IEEE Std 1003.1-2001,
51       <math.h>
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54       Portions  of  this text are reprinted and reproduced in electronic form
55       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
56       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
57       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
58       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
59       event of any discrepancy between this version and the original IEEE and
60       The  Open Group Standard, the original IEEE and The Open Group Standard
61       is the referee document. The original Standard can be  obtained  online
62       at http://www.opengroup.org/unix/online.html .
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66IEEE/The Open Group                  2003                         COPYSIGN(3P)
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