You best off keeping $var in the scope of the loop:

for my $var (0..9){   #UPDATE: I changed 1-9 to 0-9
    print $var;
}

#actually, this is better . . . but I digress . . .
print (0..9);
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No need to declare $var and assign zero to it like you did in the first example. There really is no need to keep $var around after you have finished the loop. If you need to remember what it was, look at the array you were looping through. Rarely are you going to say (1..9) in any serious program, unless you love playing catch-up to scalability:

my @numbers = (0..9);
foreach my $n (@numbers) {
    print $n;
}
print "\n", scalar(@numbers), "\n";
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will produce

0123456789
10
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As for why this:

my $var;
for ($var=1; $var < 10; ++$var){
    print $var;
}
print "\n", $var, "\n";
[download]

yields $var = 10 after it finishes, the reason is because that's how a C-style for loop works. Think about it. It _HAS_ to be 10, because $var increments 1 at a time . . .
and in order for the loop to stop . . . .
$var has to be equal to 10 . . . ;)

Jeff

R-R-R--R-R-R--R-R-R--R-R-R--R-R-R--
L-L--L-L--L-L--L-L--L-L--L-L--L-L--

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