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  1. or download this
    > perl5 -E 'say 3e-1 - .3'
0
  2. or download this
    > perl6 -e 'say 3e-1 - .3'
5.55111512312578e-17
  3. or download this
    > printf "%.100f\n", .3;
0.30000000000000000000000000000000000000000000000000000000000000000000
+00000000000000000000000000000000
>