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BJP3 Self-Check 12.14: mystery5

Language/Type: Java recursion recursive tracing
Author: Whitaker Brand (on 2013/04/01)

For each call to the following method, indicate what value is returned: 

public int mystery5(int x, int y) {
    if (x < 0) {
        return -mystery5(-x, y);
    } else if (y < 0) {
        return -mystery5(x, -y);
    } else if (x == 0 && y == 0) {
        return 0;
    } else {
        return 100 * mystery5(x / 10, y / 10) + 10 * (x % 10) + y % 10;
    }
}
mystery5(5, 7)
mystery5(12, 9)
mystery5(-7, 4)
mystery5(-23, -48)
mystery5(128, 343)

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