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  1. or download this
    #! perl -slw
use strict;
...
1.1e10 ** -10
1 + 2 * 3
3 + 2 ** 2 ** 2 * 3
  2. or download this
    c:\test>expr_parser.pl
'1 + 2' = 3
...
'1 + 2 * 3' = 7
'3 + 2 ** 2 ** 2 * 3' = 51