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  1. or download this
    use strict;
use warnings;
...
printf "%.${prec}e %a\n", $down, $down;
printf "%.${prec}e %a\n", $val,  $val;
printf "%.${prec}e %a\n", $up,   $up;
  2. or download this
    9.9999999999999989e-01 0x1.fffffffffffffp-1
1.0000000000000000e+00 0x1p+0
1.0000000000000002e+00 0x1.0000000000001p+0