projects / unix-history / blame
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1 | .\" Copyright (c) 1991, 1993 |
| 2 | .\" The Regents of the University of California. All rights reserved. | |
| 26c1d2b2 | 3 | .\" |
| c0567266 KB |
4 | .\" Redistribution and use in source and binary forms, with or without |
| 5 | .\" modification, are permitted provided that the following conditions | |
| 6 | .\" are met: | |
| 7 | .\" 1. Redistributions of source code must retain the above copyright | |
| 8 | .\" notice, this list of conditions and the following disclaimer. | |
| 9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
| 10 | .\" notice, this list of conditions and the following disclaimer in the | |
| 11 | .\" documentation and/or other materials provided with the distribution. | |
| 12 | .\" 3. All advertising materials mentioning features or use of this software | |
| 13 | .\" must display the following acknowledgement: | |
| 14 | .\" This product includes software developed by the University of | |
| 15 | .\" California, Berkeley and its contributors. | |
| 16 | .\" 4. Neither the name of the University nor the names of its contributors | |
| 17 | .\" may be used to endorse or promote products derived from this software | |
| 18 | .\" without specific prior written permission. | |
| 19 | .\" | |
| 20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 30 | .\" SUCH DAMAGE. | |
| 26c1d2b2 | 31 | .\" |
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32 | .\" @(#)isinf.3 8.1 (Berkeley) 6/4/93 |
| 33 | .\" | |
| 34 | .Dd June 4, 1993 | |
| d5001484 CL |
35 | .Dt ISINF 3 |
| 36 | .Os | |
| 37 | .Sh NAME | |
| 38 | .Nm isinf , | |
| 39 | .Nm isnan | |
| 40 | .Nd test for infinity or not-a-number (\*(Na) | |
| 41 | .Sh SYNOPSIS | |
| 42 | .Ft int | |
| 43 | .Fn isinf double | |
| 44 | .Ft int | |
| 45 | .Fn isnan double | |
| 46 | .Sh DESCRIPTION | |
| 47 | The | |
| 48 | .Fn isninf | |
| 49 | function | |
| 50 | returns 1 if the number is | |
| 51 | .Dq \\*(If , | |
| 52 | otherwise 0. | |
| 53 | .Pp | |
| 54 | The | |
| 55 | .Fn isnan | |
| 56 | function | |
| 57 | returns 1 if the number is | |
| 58 | .Dq \\*(Na , | |
| 59 | otherwise 0. | |
| 60 | .Sh SEE ALSO | |
| 61 | .Xr math 3 | |
| 62 | .Rs | |
| 63 | .%T "IEEE Standard for Binary Floating-Point Arithmetic" | |
| 64 | .%Q ANSI | |
| 65 | .%R Std 754-1985 | |
| 66 | .Re | |
| 67 | .Sh BUGS | |
| 68 | Neither the | |
| 69 | .Tn VAX | |
| 70 | nor the Tahoe floating point have distinguished values | |
| 26c1d2b2 KB |
71 | for either infinity or not-a-number. |
| 72 | These routines always return 0 on those architectures. |