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  1. or download this
    use warnings;
use strict;
...
printf "long version of ulp: %s\n", Math::MPFR->new($ulp);
my $l2 = log2($ulp);
printf "log2(ulp) = %d, so I expect it to fit within %d digits of the 
+fixed decimal point\n", $l2, -$l2;
  2. or download this
    __OUTPUT__
POS_NORM_SMALLEST = 2**-1022
...
[303 digits long]: 2.2250738585072018771558785585789482407880088486837
+041956131300312119688603996006965297904292212628858639037013670281908
+017171296072711910355127227413175152199055740043138804567803233377539
+881639177387328959246074229270113078053813397081653361296447449529789
+5212189790907838525833659018517896187998851504e-308
For _FIXED POINT_ notation,
        starts 308 digits after the decimal point