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72 lines
2.6 KiB
Groff
72 lines
2.6 KiB
Groff
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.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)isinf.3 8.2 (Berkeley) 1/29/94
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.\"
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.TH ISINF 3 "15 September 1997" GNO "Library Routines"
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.SH NAME
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.BR isinf ,
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.BR isnan
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\- test for infinity or not-a-number
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.SH SYNOPSIS
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#include <math.h>
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.sp 1
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int
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.BR isinf (extended);
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.br
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int
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.BR isnan (extended);
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.SH DESCRIPTION
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The
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.BR isinf
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function
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returns 1 if the number is
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.IR "+/- Infinity" ,
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otherwise 0.
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.LP
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The
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.BR isnan
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function
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returns 1 if the number is
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.IR not-a-number " (NaN),"
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otherwise 0.
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.SH SEE ALSO
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.BR math (3),
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.sp 1
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.IR "IEEE Standard for Binary Floating-Point Arithmetic" ,
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ANSI Std 754-1985
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.sp 1
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.IR "Apple Numerics Manual " "(SANE)"
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.SH BUGS
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Neither the VAX nor the Tahoe floating point have distinguished values
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for either infinity or not-a-number.
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These routines always return 0 on those architectures.
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