Chapter 13, Problem 2RE

Program Plan Intro

Recursion:

• Java-recursion is a mechanism in which a method continuously calls itself.
• In java, a method which calls itself is called recursive method.
• Using this mechanism, some problems can be solved easily.
• For example, problems like, Tower of Hanoi(TOH), Inorder/Preorder/Postorder Tree Travels, DFS of Graph are solved using recursion.
• Syntax of recursive methods,

  //define recursive method

  returntype methodname()

  {

//code to be executed

//calling same method  

methodname();

}

• In the above code, a method “methodname()” is a recursive method because, in the definition, this method calls by itself.