Chapter 13, Problem 2PE

Program Plan Intro

Area of a Square

Program plan:

Filename: “Square.java”

This program file is used to define a class “Square”. In the code,

• Define a class “Square”.
  • Declare class members “width”.
  • Define a constructor “Square ()”.
    • Initialize the “width”.
  • Define a method “getArea()”.
    • If the “width” is less than or equal to 0,
      • Return “0”.
        • If the “width” is equal to “1”,
        • • Return “1”.
        • Create the object of class “Square”.
        • Calculate “smallerArea” by recursively calling “getArea”.
        • Return the value of “smallerArea + width + height - 1”

Filename: “SquareDemo.java”

This program file is used to define a class “SquareDemo”. In the code,

• Define a class “SquareDemo”.
  • Define a method “main()”.
    • Create the object “s1” of class “Square”.
    • Create the object “s2” of class “Square”.
    • Call the method “getArea()” and print the result.
    • Print the expected result.
    • Call the method “getArea()” and print the result.
    • Print the expected result.