1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
3 .\" Permission is granted to make and distribute verbatim copies of this
4 .\" manual provided the copyright notice and this permission notice are
5 .\" preserved on all copies.
7 .\" Permission is granted to copy and distribute modified versions of this
8 .\" manual under the conditions for verbatim copying, provided that the
9 .\" entire resulting derived work is distributed under the terms of a
10 .\" permission notice identical to this one.
12 .\" Since the Linux kernel and libraries are constantly changing, this
13 .\" manual page may be incorrect or out-of-date. The author(s) assume no
14 .\" responsibility for errors or omissions, or for damages resulting from
15 .\" the use of the information contained herein. The author(s) may not
16 .\" have taken the same level of care in the production of this manual,
17 .\" which is licensed free of charge, as they might when working
20 .\" Formatted or processed versions of this manual, if unaccompanied by
21 .\" the source, must acknowledge the copyright and authors of this work.
23 .\" References consulted:
24 .\" Linux libc source code
25 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
27 .\" Modified Sat Jul 24 19:11:11 1993 by Rik Faith (faith@cs.unc.edu)
28 .\" Modified 2004-11-12 as per suggestion by Fabian Kreutz/AEB
29 .\" to note that this function is not available in glibc2.
31 .TH INFNAN 3 1993-06-02 "GNU" "Linux Programmer's Manual"
33 infnan \- deal with infinite or not-a-number (NaN) result
38 .BI "double infnan(int " error );
45 function returns a suitable value for infinity and
46 "not-a-number" (NaN) results.
47 The value of \fIerror\fP can be
49 to represent infinity or anything else to represent NaN.
59 If \fIerror\fP is \-\fBERANGE\fP (\-Infinity), \-\fBHUGE_VAL\fP is returned.
61 If \fIerror\fP is anything else, NAN is returned.
65 The value of \fIerror\fP is "not-a-number" (NaN).
68 The value of \fIerror\fP is positive infinity or negative infinity.
72 This obsolete function was provided in
73 libc4 and libc5, but is not available in glibc2.