プログラミングのお題スレ Part12

>>628 >>630 Perl5
for (<DATA>) {
($X, $y) = split;
$x = $m = $X % $y;
my $n;
do {
$x = 10 * $x % $y;
$n++
} while $x != $m;
print "$X/$y => ", ($x ? $n : $x), "\n";
}
__DATA__
1 3
10 2
988027 983
919 870473
1223 1476221
99998360006603 9999901
123412345 999999999

実行
$ perl 12_628.pl
1/3 => 1
10/2 => 0
988027/983 => 982
919/870473 => 54288
1223/1476221 => 122816
99998360006603/9999901 => 1999980
123412345/999999999 => 9