isnormal.3m (2010 09)

i
isnormal(3M) isnormal(3M)
NAME
isnormal( ) - floating-point test for normalized value
SYNOPSIS
#include <math.h>
int isnormal(floating-type x);
DESCRIPTION
The isnormal() macro determines whether its argument is a normalized value (neither zero, denor-
malized, infinite, nor NaN). The argument must be of floating type, and classification is based on the
type of the argument. For HP Integrity servers, the argument can be any floating type. For PA-RISC, the
argument must be either double or float.
USAGE
To use the
isnormal() macro, compile either with the default
-Ae option or with the -Aa and
-D_HPUX_SOURCE
options. Make sure your program includes <math.h>. Link in the math library by
specifying
-lm on the compiler or linker command line.
RETURN VALUE
The
isnormal() macro returns a nonzero value if and only if its argument has a normalized value.
The macro raises no floating-point exceptions.
ERRORS
No errors are defined.
EXAMPLES
Make sure a value is normalized before continuing operations on it:
#include <math.h>
/*...*/
float x;
/*...*/
if (isnormal(x))
/*...*/
SEE ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), signbit(3M), math(5).
STANDARDS CONFORMANCE
isnormal(): ISO/IEC C99
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1