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  1. or download this
    C:\_64\strawberry5.24.1>perl -e"CORE::say sprintf '%.20g', 0.1"
0.10000000000000001

C:\_64\strawberry5.24.1>
  2. or download this
    C:\>perl -MMath::MPFR=":mpfr" -le "$x=Math::MPFR->new('0.1'); $base=10
+; $digits=20; Rmpfr_out_str($x, $base, $digits, MPFR_RNDN);"
1.0000000000000000555e-1
C:\>
  3. or download this
    C:\>perl -e"CORE::say sprintf '%.20g', 0.1"
0.10000000000000000555

C:\>