date and time created 91/03/18 17:01:12 by bostic

SCCS-vsn: lib/libc/gen/isinf.3 5.1

diff --git a/usr/src/lib/libc/gen/isinf.3 b/usr/src/lib/libc/gen/isinf.3
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+.\" Copyright (c) 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" %sccs.include.redist.man%
+.\"
+.\"    @(#)isinf.3     5.1 (Berkeley) %G%
+.\"
+.TH ISINF 3 ""
+.UC 7
+.SH NAME
+isinf, isnan \- return if infinity or not-a-number
+.SH SYNOPSIS
+.nf
+.ft B
+int isinf(double);
+int isnan(double);
+.fr R
+.fi
+.SH DESCRIPTION
+.I Isninf
+returns 1 if the number is ``infinity'', otherwise 0.
+.PP
+.I Isnan
+returns 1 if the number is ``NaN'', otherwise 0.
+.SH SEE ALSO
+.IR math (3)
+.sp
+.IR "IEEE Standard for Binary Floating-Point Arithmetic" ,
+ANSI/IEEE Std 754-1985
+.SH BUGS
+Neither the VAX nor the Tahoe floating point have distinguished values
+for either infinity or not-a-number.
+These routines always return 0 on those architectures.