In Perl, a string is not an array of characters as in C. Reversing a string is easy, though: use reverse:
$string = reverse $string;

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Update: What do you mean by doing it "without using any built-in function"? In your example, are you going to implement floor yourself?

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In reply to Re: reverse a string in place by choroba
in thread reverse a string in place by Priti24

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