If condition based look up not working [closed]

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In Perl the comparison operators for numbers are <, ==, >, <=, >. If you use the string operators (le, ge, etc) you are comparing the numbers as strings. So, for example, 10 is greater than 1 but less than 4.

Also note that you’re doing redundant testing. Consider

    if($_[0] < 1)            { you didn't cover this case }
    elsif($_[0] <= 4)        { $x_id = "x.1"; }
    elsif($_[0] <= 8)        { $x_id = "x.2"; }
    elsif($_[0] <= 12)       { $x_id = "x.3"; }
    etc...

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