HP-UX Reference (11i v1 05/09) - 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 has a normalized value (neither zero, denor-
malized, 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 stan-
dard.
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))
/*...*/
SEE ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), signbit(3M), math(5).
Section 3−−510 Hewlett-Packard Company − 1 − HP-UX 11i Version 1: September 2005