Question: 6 -

To end a recursive method a RETURN statement is usually kept inside ___.

IF block

None of these

IF or ELSE block

ELSE block

Answer:

IF or ELSE block

Solution:

A proper RETURN statement ends the recursion process when kept inside a conditional IF or ELSE block.

Question: 7 -

What is the output of the below Java program with recursion?

public class RecursionTesting
{
  static int num=4;
  public static void main(String[] args)
  {
    new RecursionTesting().recursiveMethod();
  }

  void recursiveMethod()
  {
    num--;
    if(num == 0)
      return;
    System.out.print(num + " ");
    recursiveMethod();
  }
}

3 2 1 0

Compiler error

4 3 2 1

3 2 1

Answer:

3 2 1 0

Solution:

Note that this recursive method does not return anything. It simply does the printing of some values.

Question: 8 -

What is the maximum number of levels in a Recursion?

No limit

16

8

18

Answer:

No limit

Solution:

There is no limit. The limit actually depends on the size of Stack Memory. If you process a large amount of data, it may lead to a Stack Overflow error.

Question: 9 -

What is the output of the below Java program with Recursion?

public class RecursionTest2
{
  public static void main(String[] args)
  {
    RecursionTest2 rt2 = new RecursionTest2();
    int sum = rt2.summer(4);
    System.out.println(sum);
  }

  int summer(int in)
  {
    int sum = 0;

    if(in ==0)
	  return 0;

    sum = in + summer(--in);	
    return sum;
  }
}

0

10

6

Infinite loop

Answer:

10

Solution:

IN 4
IN 3
IN 2
IN 1
IN 0
10

Question: 10 -

Which is the common problem with Recursive methods in Java?

None

IndexOutOfBoundsException

StackOverflowError

OutOfMemoryError

Answer:

StackOverflowError

Solution:

StackOverError occurs when the stack has been full and can not allocate space for continuing new method call.