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BJP4 Self-Check 12.6: mysteryXY

Language/Type: Java recursion recursive tracing
Author: Marty Stepp (on 2016/09/08)

For each call to the following method, indicate what console output is produced: 

public void mysteryXY(int x, int y) {
    if (y == 1) {
        System.out.print(x);
    } else {
        System.out.print(x * y + ", ");
        mysteryXY(x, y - 1);
        System.out.print(", " + x * y);
    }
}
mysteryXY(4, 1);
mysteryXY(4, 2);
mysteryXY(8, 2);
mysteryXY(4, 3);
mysteryXY(3, 4);

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