Chapter 13, Problem 1PE

Program Plan Intro

Area of a Rectangle

Program plan:

Filename: “Rectangle.java”

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

• Define a class “Rectangle”.
  • Declare class members “width” and “height”.
  • Define a constructor “Rectangle()”.
    • Initialize the “width” and “height”.
  • 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*height”.
        • Create the object of class “Rectangle”.
        • Calculate “smallerArea” by recursively calling “getArea”.
        • Return the value of “smallerArea + width + height - 1”

Filename: “RectangleDemo.java”

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

• Define a class “RectangleDemo”.
  • Define a method “main()”.
    • Create the object “r1” of class “Rectangle”.
    • Create the object “r2” of class “Rectangle”.
    • Call the method “getArea()” and print the result.
    • Print the expected result.
    • Call the method “getArea()” and print the result.
    • Print the expected result.