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foreach ( 0 .. 10 ) {
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print "$_! = " . factorial( $_ ) . "\n";
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}
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sub factorial
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{
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my $number = shift; # get the argument
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if ( $number <= 1 ) { # base case
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return 1;
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}
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else { # recursive step
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return $number * factorial( $number - 1 );
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}
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}
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