HP-UX Reference (11i v2 07/12) - 3 Library Functions A-M (vol 6)

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, denormal-

ized, 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))

/*...*/