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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Sat Jul 24 19:11:11 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2004-11-12 as per suggestion by Fabian Kreutz/AEB
.\" to note that this function is not available in glibc2.
.\"
.TH INFNAN 3 1993-06-02 "GNU" "Linux Programmer's Manual"
.SH NAME
infnan \- deal with infinite or not-a-number (NaN) result
.SH SYNOPSIS
.nf
.B #include <math.h>
.sp
.BI "double infnan(int " error );
.fi
.sp
Link with \fI-lm\fP.
.SH DESCRIPTION
The
.BR infnan ()
function returns a suitable value for infinity and
"not-a-number" (NaN) results.
The value of \fIerror\fP can be ERANGE
to represent infinity or anything else to represent NaN.
\fIerrno\fP
is also set.
.SH "RETURN VALUE"
If \fIerror\fP is ERANGE (Infinity), HUGE_VAL is returned.
.PP
If \fIerror\fP is \-ERANGE (\-Infinity), \-HUGE_VAL is returned.
.PP
If \fIerror\fP is anything else, NAN is returned.
.SH ERRORS
.TP
.B EDOM
The value of \fIerror\fP is "not-a-number" (NaN).
.TP
.B ERANGE
The value of \fIerror\fP is positive or negative infinity.
.SH "CONFORMING TO"
4.3BSD
.SH NOTES
This obsolete function was provided in
.I libc4
and
.IR libc5 ,
but is not available in
.IR glibc2 .
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