Because you did not RTFM :) 
reverse LIST
        In list context, returns a list value consisting of the elemen
+ts
        of LIST in the opposite order. In scalar context, concatenates
        the elements of LIST and returns a string value with all
        characters in the opposite order.

            print reverse <>;           # line tac, last line first

            undef $/;                   # for efficiency of <>
            print scalar reverse <>;    # character tac, last line tsr
+if

        Used without arguments in scalar context, reverse() reverses $
+_.

        This operator is also handy for inverting a hash, although the
+re
        are some caveats. If a value is duplicated in the original has
+h,
        only one of those can be represented as a key in the inverted
        hash. Also, this has to unwind one hash and build a whole new
        one, which may take some time on a large hash, such as from a
        DBM file.

            %by_name = reverse %by_address;     # Invert the hash

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In reply to Re^7: Binary to decimal conversion by Anonymous Monk
in thread Binary to decimal conversion by andreas1234567

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