Question

Implement a class Rectangle. Provide a constructor to construct a rectangle with a given width and height, member functions get_perimeter and get_area that compute the perimeter and area, and a member function void resize(double factor) that resizes the rectangle by multiplying the width and height by the given factor. (Page EX9-3).

Answer 1

Answer:

//class declaration

public class Rectangle{

   

   //declare the instance variables - width and height

   double width;

   double height;

   

   

   //the constructor

  public Rectangle(double width, double height){

       

       //initialize the width of the rectangle

       this.width = width;

       

       //initialize the height of the rectangle

      this.height = height;

       

   }

   

   

   //method get_perimeter to compute the perimeter of the rectangle

   public double get_perimeter(){

       

       //compute the perimeter

       //by using the formula 2(width + height)

      double perimeter = 2*(this.width + this.height);

       

       //return the perimeter

       return perimeter;

   }

   

   //method get_area to compute the area of the rectangle

   public double get_area(){

       

       //compute the area

       //by multiplying the width and height of the rectangle

       double area = this.width * this.height;

       

       //return the area

      return area;

   }

   

   

   //method resize to resize the rectangle

   public void resize(double factor){

       

       //resize the width of the rectangle

       //by multiplying the width by the factor

       this.width = this.width * factor;

       

       //resize the height of the rectangle

       //by multiplying the height by the factor

      this.height = this.height * factor;

     

   }

   

}  //end of class declaration

Explanation:

The code above has been written in Java. In contains comments explaining every part of the program.