| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | .\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org> |
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| 13 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 25 | .\" $FreeBSD: src/lib/msun/man/signbit.3,v 1.1 2004/07/19 08:16:10 das Exp $ |
| 26 | .\" |
| 27 | .Dd July 18, 2004 |
| 28 | .Dt SIGNBIT 3 |
| 29 | .Os |
| 30 | .Sh NAME |
| 31 | .Nm signbit |
| 32 | .Nd "determine whether a floating-point number's sign is negative" |
| 33 | .Sh LIBRARY |
| 34 | .Lb libm |
| 35 | .Sh SYNOPSIS |
| 36 | .In math.h |
| 37 | .Ft int |
| 38 | .Fn signbit "real-floating x" |
| 39 | .Sh DESCRIPTION |
| 40 | The |
| 41 | .Fn signbit |
| 42 | macro takes an argument of |
| 43 | .Fa x |
| 44 | and returns non-zero if the value of its sign is negative, otherwise 0. |
| 45 | .Sh SEE ALSO |
| 46 | .Xr fpclassify 3 , |
| 47 | .Xr math 3 |
| 48 | .Sh STANDARDS |
| 49 | The |
| 50 | .Fn signbit |
| 51 | macro conforms to |
| 52 | .St -isoC-99 . |
| 53 | .Sh HISTORY |
| 54 | The |
| 55 | .Fn signbit |
| 56 | macro was added in |
| 57 | .Fx 5.1 . |