nomor 1 pertemuan 4

package pertemuan4;
public class nomor1 {
    static int ack(int m, int n) {
        if (m == 0)
        {return n + 1;}
        else if((m > 0) && (n == 0))
        {return ack(m - 1, 1);}
        else if((m > 0) && (n > 0))
        {return ack(m - 1, ack(m, n - 1));}
        else
        return n + 1;
    }
    public static void main(String args[])
    {
        System.out.println(ack(2, 9));
    }
}