riddle

int do_op(int x, int y,int op)
{
    int ans = -1;
    switch(op)
    {
        case 0: ans = x + y;break;
        case 1: ans = x - y;break;
        case 2: ans = x * y;break;
        case 3: ans = x / y;break;
    }
    return ans;
}

int main()
{
    char opcode[4] = {'+','-','*','/'};
    int i,j, k,l;
    for(i = 0; i < 4; i++)
        for(j = 0; j < 4; j++)
            for(k = 0;k < 4; k++)
                    printf("3 %c 3 %c 3 %c 3 = %d\n",opcode[i],opcode[j],opcode[k],do_op(do_op(do_op(3,3,i),3,j),3,k));
}

/*
OUTPUT:

3 + 3 + 3 + 3 = 12
3 + 3 + 3 - 3 = 6
3 + 3 + 3 * 3 = 27
3 + 3 + 3 / 3 = 3
3 + 3 - 3 + 3 = 6
3 + 3 - 3 - 3 = 0
3 + 3 - 3 * 3 = 9
3 + 3 - 3 / 3 = 1
3 + 3 * 3 + 3 = 21
3 + 3 * 3 - 3 = 15
3 + 3 * 3 * 3 = 54
3 + 3 * 3 / 3 = 6
3 + 3 / 3 + 3 = 5
3 + 3 / 3 - 3 = -1
3 + 3 / 3 * 3 = 6
3 + 3 / 3 / 3 = 0
3 - 3 + 3 + 3 = 6
3 - 3 + 3 - 3 = 0
3 - 3 + 3 * 3 = 9
3 - 3 + 3 / 3 = 1
3 - 3 - 3 + 3 = 0
3 - 3 - 3 - 3 = -6
3 - 3 - 3 * 3 = -9
3 - 3 - 3 / 3 = -1
3 - 3 * 3 + 3 = 3
3 - 3 * 3 - 3 = -3
3 - 3 * 3 * 3 = 0
3 - 3 * 3 / 3 = 0
3 - 3 / 3 + 3 = 3
3 - 3 / 3 - 3 = -3
3 - 3 / 3 * 3 = 0
3 - 3 / 3 / 3 = 0
3 * 3 + 3 + 3 = 15
3 * 3 + 3 - 3 = 9
3 * 3 + 3 * 3 = 36
3 * 3 + 3 / 3 = 4
3 * 3 - 3 + 3 = 9
3 * 3 - 3 - 3 = 3
3 * 3 - 3 * 3 = 18
3 * 3 - 3 / 3 = 2
3 * 3 * 3 + 3 = 30
3 * 3 * 3 - 3 = 24
3 * 3 * 3 * 3 = 81
3 * 3 * 3 / 3 = 9
3 * 3 / 3 + 3 = 6
3 * 3 / 3 - 3 = 0
3 * 3 / 3 * 3 = 9
3 * 3 / 3 / 3 = 1
3 / 3 + 3 + 3 = 7
3 / 3 + 3 - 3 = 1
3 / 3 + 3 * 3 = 12
3 / 3 + 3 / 3 = 1
3 / 3 - 3 + 3 = 1
3 / 3 - 3 - 3 = -5
3 / 3 - 3 * 3 = -6
3 / 3 - 3 / 3 = 0
3 / 3 * 3 + 3 = 6
3 / 3 * 3 - 3 = 0
3 / 3 * 3 * 3 = 9
3 / 3 * 3 / 3 = 1
3 / 3 / 3 + 3 = 3
3 / 3 / 3 - 3 = -3
3 / 3 / 3 * 3 = 0
3 / 3 / 3 / 3 = 0

*/