HP-UX Reference (11i v2 04/09) - 3 Library Functions A-M (vol 6)

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 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))
/*...*/
SEE ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), signbit(3M), math(5).
STANDARDS CONFORMANCE
isnormal(): ISO/IEC C99
Section 3−−570 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: September 2004