ISNORMAL(P) POSIX Programmer's Manual ISNORMAL(P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAMEisnormal - test for a normal value
SYNOPSIS
#include <math.h>
int isnormal(real-floating x);
DESCRIPTION
The isnormal() macro shall determine whether its argument value is nor‐
mal (neither zero, subnormal, infinite, nor NaN). First, an argument
represented in a format wider than its semantic type is converted to
its semantic type. Then determination is based on the type of the argu‐
ment.
RETURN VALUE
The isnormal() macro shall return a non-zero value if and only if its
argument has a normal value.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOfpclassify() , isfinite() , isinf() , isnan() , signbit() , the Base
Definitions volume of IEEE Std 1003.1-2001, <math.h>
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 .
IEEE/The Open Group 2003 ISNORMAL(P)
