Chapter 17.3, Problem 11SCP

Program Plan Intro

A method “size()”

Program plan:

• Define the method “size()”,
  • Return the value obtained from making the function call on the method “size()”.
• Define the parameterized method “size()”,
  • Check whether the root is null,
    • If it is true, return “0”.
      • Otherwise,
        • Return the value calculated from the expression that contains the function calls.