in reply to decimal to fraction

The same with Perl 6: 
> say 0.421875.nude
(27 64)
>

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Note: nude stands for numerator-denominator.

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Re^2: decimal to fraction
by no_slogan (Deacon) on Sep 24, 2017 at 15:30 UTC 
    > 0.49420098210293.nude
(49420098210293 100000000000000)
> 0.49420098210293.Num().Rat(1e-15).nude
(463051 936969)

    [download]
    Yay Perl6. Took me a while to figure out the magic incantation, because the Perl6 documentation is nigh incomprehensible. Also, Rat() ignores the epsilon parameter if it's called on a rational. Sometimes, you'd like to find a fraction that's an approximation of another fraction without mashing it down to a float first.
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In Section Cool Uses for Perl