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$x->digit($n);          # return the nth digit, counting from right
$x->digit(-$n);         # return the nth digit, counting from left

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13:45 >perl -MMath::BigFloat -wE "my $n = Math::BigFloat->new(123); sa
+y $n; say $n->digit(-1);"
123
...
        C:\Perl\Strawberry\strawberry-perl-5.18.2.1-64bit-portable\per
+l\lib\Math\BigFloat.pm: 1.998

13:46 >