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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "NAN" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" nan 
+.SH NAME
+nan, nanf, nanl \- return quiet NaN
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+double nan(const char *\fP\fItagp\fP\fB);
+.br
+float nanf(const char *\fP\fItagp\fP\fB);
+.br
+long double nanl(const char *\fP\fItagp\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The function call \fInan\fP("\fIn-char-sequence\fP") shall be equivalent
+to:
+.sp
+.RS
+.nf
+
+\fBstrtod("NAN(\fP\fIn-char-sequence\fP\fB)", (char **) NULL);
+\fP
+.fi
+.RE
+.LP
+The function call \fInan\fP("") shall be equivalent to:
+.sp
+.RS
+.nf
+
+\fBstrtod("NAN()", (char **) NULL)
+\fP
+.fi
+.RE
+.LP
+If \fItagp\fP does not point to an \fIn\fP- \fBchar\fP sequence or
+an empty string, the function call shall be equivalent
+to:
+.sp
+.RS
+.nf
+
+\fBstrtod("NAN", (char **) NULL)
+\fP
+.fi
+.RE
+.LP
+Function calls to \fInanf\fP() and \fInanl\fP() are equivalent to
+the corresponding function calls to \fIstrtof\fP() and \fIstrtold\fP().
+.SH RETURN VALUE
+.LP
+These functions shall return a quiet NaN, if available, with content
+indicated through \fItagp\fP.
+.LP
+If the implementation does not support quiet NaNs, these functions
+shall return zero.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIstrtod\fP() , \fIstrtold\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<math.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .