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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| 11 | .\" | |
| 12 | .\" Since the Linux kernel and libraries are constantly changing, this | |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| 19 | .\" | |
| 20 | .\" Formatted or processed versions of this manual, if unaccompanied by | |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" References consulted: | |
| 24 | .\" Linux libc source code | |
| 25 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 26 | .\" 386BSD man pages | |
| 27 | .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) | |
| 28 | .\" Modified 2002-08-10 by Walter Harms (walter.harms@informatik.uni-oldenburg.de) | |
| 29 | .TH COPYSIGN 3 2002-08-10 "GNU" "Linux Programmer's Manual" | |
| 30 | .SH NAME | |
| 31 | copysign, copysignf, copysignl \- copy sign of a number | |
| 32 | .SH SYNOPSIS | |
| 33 | .nf | |
| 34 | .B #include <math.h> | |
| 35 | .sp | |
| 36 | .BI "double copysign(double " x ", double " y ); | |
| 37 | .br | |
| 38 | .BI "float copysignf(float " x ", float " y ); | |
| 39 | .br | |
| 40 | .BI "long double copysignl(long double " x ", long double " y ); | |
| 41 | .fi | |
| 42 | .sp | |
| 43 | Link with \-lm. | |
| 44 | .SH DESCRIPTION | |
| 63aa9df0 | 45 | The \fBcopysign\fP() functions return a value whose absolute value matches |
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46 | that of \fIx\fP, but whose sign matches that of \fIy\fP. |
| 47 | If \fIx\fP is a NaN, then a NaN with the sign of \fIy\fP is returned. | |
| 48 | .SH NOTES | |
| 63aa9df0 | 49 | The \fBcopysign\fP() functions may treat a negative zero as positive. |
| fea681da | 50 | .SH "CONFORMING TO" |
| b14d4aa5 | 51 | C99, 4.3BSD. |
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52 | This function is defined in IEC 559 (and the appendix with |
| 53 | recommended functions in IEEE 754/IEEE 854). | |
| 54 | .SH "SEE ALSO" | |
| 55 | .BR signbit (3) |