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diff --git a/man3/copysign.3 b/man3/copysign.3 new file mode 100644 index 000000000..eebc72ef7 --- /dev/null +++ b/man3/copysign.3 @@ -0,0 +1,55 @@ +.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" Permission is granted to make and distribute verbatim copies of this +.\" manual provided the copyright notice and this permission notice are +.\" preserved on all copies. +.\" +.\" Permission is granted to copy and distribute modified versions of this +.\" manual under the conditions for verbatim copying, provided that the +.\" entire resulting derived work is distributed under the terms of a +.\" permission notice identical to this one. +.\" +.\" Since the Linux kernel and libraries are constantly changing, this +.\" manual page may be incorrect or out-of-date. The author(s) assume no +.\" responsibility for errors or omissions, or for damages resulting from +.\" the use of the information contained herein. The author(s) may not +.\" have taken the same level of care in the production of this manual, +.\" which is licensed free of charge, as they might when working +.\" professionally. +.\" +.\" Formatted or processed versions of this manual, if unaccompanied by +.\" the source, must acknowledge the copyright and authors of this work. +.\" +.\" References consulted: +.\" Linux libc source code +.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) +.\" 386BSD man pages +.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) +.\" Modified 2002-08-10 by Walter Harms (walter.harms@informatik.uni-oldenburg.de) +.TH COPYSIGN 3 2002-08-10 "GNU" "Linux Programmer's Manual" +.SH NAME +copysign, copysignf, copysignl \- copy sign of a number +.SH SYNOPSIS +.nf +.B #include <math.h> +.sp +.BI "double copysign(double " x ", double " y ); +.br +.BI "float copysignf(float " x ", float " y ); +.br +.BI "long double copysignl(long double " x ", long double " y ); +.fi +.sp +Link with \-lm. +.SH DESCRIPTION +The \fBcopysign()\fP functions return a value whose absolute value matches +that of \fIx\fP, but whose sign matches that of \fIy\fP. +If \fIx\fP is a NaN, then a NaN with the sign of \fIy\fP is returned. +.SH NOTES +The \fBcopysign()\fP functions may treat a negative zero as positive. +.SH "CONFORMING TO" +C99, BSD 4.3. +This function is defined in IEC 559 (and the appendix with +recommended functions in IEEE 754/IEEE 854). +.SH "SEE ALSO" +.BR signbit (3) |