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32.\" from: @(#)floor.3 6.5 (Berkeley) 4/19/91
33.\" $Id: nan.3,v 1.5 2004/12/20 21:35:46 scp Exp $
34.\"
35.Dd July 01, 2008
36.Dt NAN 3
37.Os
38.Sh NAME
39.Nm nan
40.Nd generate a quiet NaN
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn nan "const char *tagp"
45.Ft long double
46.Fn nanl "const char *tagp"
47.Ft float
48.Fn nanf "const char *tagp"
49.Sh DESCRIPTION
50The
51.Fn nan
52functions return a quiet NaN, whose trailing fraction field contains the result
53of converting
54.Fa tagp
55to an unsigned integer. If
56.Fa tagp
57is too large to be contained in the trailing fraction field of the NaN, then
58the least significant bits of the integer represented by
59.Fa tagp
60are used.
61.Sh SPECIAL VALUES
62If
63.Fa tagp
64contains any non-numeric characters, the
65function returns a NaN whos trailing fraction field is zero.
66.Pp
67If
68.Fa tagp
69is empty, the function returns a NaN whos trailing fraction field is zero.
70.Sh STANDARDS
71The
72.Fn nan
73functions conform to ISO/IEC 9899:1999(E).