1. Given the following code:

public static void foo3(String s)

{

if (s.length() >0)

{

System.out.print(s.charAt(s.length() -1));

foo3(s.substring(0, s.length() -1));

}

}

What is the output of: foo3();

2. Using the code in #1, What is the output of foo3(Hi)

3. Fill in the missing code:

This recursive method returns even if the length of a give String is even, and odd if the length of the String is odd.

public static String foo(String s)

{

if (s.length() ==0)

return even;

else if (s.length() = = 1)

return odd;

else

//your code goes here

}

4. You coded the following in the file Test.java :

System.out.println( foo(5));

//more code here

public static int foo(int n) //line 9

{

if (n = = 0)

return 1;

else

System.out.println(n* foo(n-1) );

} //line 15

At compile time, you get the following error:

Text.java: 15: missing return statement

} //line 15

^

1 error

Explain what the problem is and how to fix it.