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,
denormalized, infinite, nor NaN).
The argument must be of floating type, and classification
is based on the type of the argument. For Itanium(R)-based systems, 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))
/*...*/
STANDARDS CONFORMANCE
isnormal(): ISO/IEC C99
