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

13       copysign, copysignf, copysignl — number manipulation function
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SYNOPSIS

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

23       The functionality described on this reference page is aligned with  the
24       ISO C  standard.  Any  conflict between the requirements described here
25       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
26       defers to the ISO C standard.
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28       These  functions  shall produce a value with the magnitude of x and the
29       sign of y.  On implementations that represent a signed zero but do  not
30       treat  negative zero consistently in arithmetic operations, these func‐
31       tions regard the sign of zero as positive.
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RETURN VALUE

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

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

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

49       None.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

55       signbit()
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57       The Base Definitions volume of POSIX.1‐2008, <math.h>
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60       Portions  of  this text are reprinted and reproduced in electronic form
61       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
62       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
63       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
64       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
65       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
66       event of any discrepancy between this version and the original IEEE and
67       The Open Group Standard, the original IEEE and The Open Group  Standard
68       is  the  referee document. The original Standard can be obtained online
69       at http://www.unix.org/online.html .
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71       Any typographical or formatting errors that appear  in  this  page  are
72       most likely to have been introduced during the conversion of the source
73       files to man page format. To report such errors,  see  https://www.ker‐
74       nel.org/doc/man-pages/reporting_bugs.html .
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78IEEE/The Open Group                  2013                         COPYSIGN(3P)
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