$foo
=
10
;
if
(
$foo
==
undef
)
{
printf
(
"foo : It's undefined"
)
;
}
else
{
printf
(
"foo : It's defined"
)
;
}
printf
(
"
\n
"
)
;
if
(
$bar
==
undef
)
{
printf
(
"bar : It's undefined"
)
;
}
else
{
printf
(
"bar : It's defined"
)
;
}