using System;

namespace Item {

​

abstract class Item{ 

    private string item_name;

    protected double item_price;

    public Item(string name){

        this.item_name = name;

    }

    public double getPrice(){

        return item_price;

    }

    public virtual double getTotalPrice(){

        return 0; 

    }

    public abstract void setPayment(double amount);

} 

​

class DiscountedItem : Item{

             private double item_discount;

             private double item_quantity;

             private double discounted_price;

             private double payment_amount;

             private double change;

    public DiscountedItem(string name, int quantity) : base(name){

        this.item_quantity = quantity;

        if(name.Equals("Wireless Gaming Mouse")) {

            this.item_price = 799.50;

        }

        else if(name.Equals("Tablet Galaxy Tab")) {

            this.item_price = 2500.00;

        }

        else if(name.Equals("5G Tablet Snapdragon")) {

            this.item_price = 6888.00;

        }

    } 

    public double getDiscount(){

        if(item_quantity >= 6){

            this.item_discount = 0.32;

        }else if(item_quantity >= 3){

            this.item_discount = 0.27;

        }else if(item_quantity < 3){

            this.item_discount = 0.00;

        }

        return item_discount;

    }   

    public override void setPayment(double amount){

        this.payment_amount = amount;

        this.change = amount - ((item_price * item_quantity) - (item_price * item_quantity * item_discount));

    } 

​

    public double getChange(){

        if(change < 0){

            Console.WriteLine("====Insufficient payment====");

            return change;

        }else{

            return change;

        }

    }

    public override double getTotalPrice(){

        return (item_price * item_quantity) - (item_price * item_quantity * item_discount); 

    } 

}

public class Program

{

    public static void Main()

    {

        String itemName, itemQuan;

        int quantity = 0, payment = 0;

        Console.Write("Enter Item: ");

        itemName = Console.ReadLine();

        Console.Write("Enter Quantity: ");

        itemQuan = Console.ReadLine();

        quantity = Convert.ToInt32(itemQuan); 

        DiscountedItem discount = new DiscountedItem(itemName,quantity);

        Console.WriteLine("====================================");

        Console.WriteLine("Discount: " + discount.getDiscount());

        Console.WriteLine("Price: " + discount.getPrice()); 

        Console.WriteLine("Total Amount: " + discount.getTotalPrice()); 

        discount.setPayment(payment); 

        Console.Write("Change: " + discount.getChange()); 

    }

}

}