Name
infnan — deal with infinite or not-a-number (NaN)
result
Synopsis
#include <math.h>
double infnan( |
int |
error) ; |
![[Note]](../stylesheet/note.png) |
Note |
Link with −lm .
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DESCRIPTION
The infnan
() function
returns a suitable value for infinity and "not-a-number"
(NaN) results. The value of error
can be ERANGE to
represent infinity or anything else to represent NaN.
errno
is also set.
RETURN VALUE
If error
is ERANGE
(Infinity), HUGE_VAL is returned.
If error
is
−ERANGE (−Infinity), −HUGE_VAL is
returned.
If error
is
anything else, NAN is returned.
ERRORS
- EDOM
-
The value of error
is "not-a-number"
(NaN).
- ERANGE
-
The value of error
is positive or
negative infinity.
NOTES
This obsolete function was provided in libc4
and libc5
, but is not available
in glibc2
.
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manual page may be incorrect or out-of-date.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.
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