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    IF not condition THEN GOTO 10
    I = 1
...
10
    I = 2
20

    INTEGER II;

...
    ELSE
        II = 2
    ENDIF

int i = ( condition ) ? 1 : 2;

{
    my $temp = $a[ $i ];
    $a[ $i ] = $a[ $j ];
    $a[ $j ] = $temp;
}

@a[ $i, $j ] = @a[ $j, $i ];

sub isleap {
    my ($year) = @_;
...
    return 1 if (( $year % 4 ) == 0 ); # All other 4's are leap
    return 0; # Everything else is not
}

not $year % 4 xor $year % 100 xor $year % 400;