Well I assumed that as soon it will match the if condition it will break. and this is the reason that I should modify it.

I am not sure that I understand correctly what you are saying, and I am not sure that you understood what I was saying.

The FAQ's original code had continue statements so that every condition is checked, even if a previous condition succeeded. So that the FAQ code, presented with 1.0 would report a non digit and then also report a real number. Your code does not do that.

For your nested if ... elsif ... else statements to work properly, you need to reorder your conditions, for example: 1. check if it is a positive integer; 2. check for a negative integer; 3. check for a (positive or negative) float; 4. check for non-digits other than those we have accepted when checking for negative and floats.

my @numbers = (1, 1.0, 123.1, 0.1);
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is certainly a good way of declaring an array of numbers, but I was only stressing that your use of qw/.../ was incorrect because of the commas.