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 has a normalized value (neither zero,
denormalized, infinite, nor NaN). The macro can be used with either
double
or
float
arguments, and classifies the argument based on its type.
The ISO/ANSI C committee has approved the
isnormal()
macro for inclusion in the C9X draft standard.
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.
ERRORS
No errors are defined.
EXAMPLE
Make sure a value is normalized before continuing operations on it:
#include <math.h>
/*...*/
float x;
/*...*/
if (isnormal(x))
/*...*/
