Your question has already been well and truly answered, but as an aside, the parentheses around the condition with postfix if are optional. So you can write:
statement if 1;
They are not optional for the block form of if though. The following is incorrect:
if 1 {
statement;
}
It's also worth mentioning that Damian Conway's Perl Best Practices suggests that you never use the postfix form of if, and always use the block form. (PBP #63) I happen to disagree with that particular PBP; most people have some PBPs that they disagree with, but PBP is usually a good starting point when developing your own Perl coding style.
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