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 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))
/*...*/
STANDARDS CONFORMANCE
isnormal(): ISO/IEC C99
Printable version
