Question

Create a main method inside the ShoppingCart 

   - create a vegetable object
       - call the addprice method polymorphically
       - call the display method polymorphically

   - create a meat object
      - call the addprice method polymorphically
      - call the display method polymorphically

Answer 1

I am solving the question in Java as the question has not specified the language to solve the problem.I am assuming the Shopping cart is a class and vegetable and meat are child classes of shopping cart. Please find the attached COMMENTS in the answer for better understanding. THANK YOU.

public static void main(String args[] ) {

/* FOR THE VEGETABLE SECTION */

ShoppingCart veg_obj= new Vegetable();   //creating the vegtable object 

veg_obj.addprice();     //calling addprice() method  polymorphically 
veg_obj.display();     // callind the display method polymorphically 

/*FOR MEAT SECTION */

ShoppingCart meat_obj= new meat();            //creating the meat object 

meat_obj.addprice();      //calling the addprice method polymorphically 

meat_obj.display();     // calling the display method polymorphically 

}