id:

1.

public void mystery (int x)
{
    if (x <= 0)
       return;
    else
    {
        System.out.print( x + "");
        mystery( x - 3);
    }
}

2.

public void mystery (int x)
{
    if (x <= 0)
    	return;
    else
    {
        mystery (x - 2);
        System.out.print(x + "");}
    }
 

What does mystery(5) print?

3.

public int mystery (int x)
{
    if (x <= 0)
   	 	return 1;
    else
    	return x * mystery(x- 2);
}
 

What does mystery(5) return?

4.

public int mystery (int x)
{
    if (x<= 10)
    	return x;
    else
    	return ((x / 10) + mystery(x/10));
}
 

What does mystery(541) return?

5.

 public int mystery(int x)
{
    if (x == 1)
   		 return 2;
    else
   		 return mystery(x - 1)*2;
}
 

What does mystery(5) return?

6.

public int mystery(int x)
{
    if (x <= 0)
    	return 0;
    else
    	return x + mystery( x-3) + mystery ( x-5);
}
 

What does mystery(8) return?

7. Which one could lead to an infinite loop?