C# find cost, calculate the cost of item and include 10% GST - c#-2.0

Question

I am studying C# and have been asked to create a grocery program. I am stuck and can't seem to find anything on the net to help me. I have created a grocery item class with properties containing Name and Price. I have also created a subclass of purchasedItem which has an integer of quantity. I now need to create a method which finds Price, calculates the Price and adds 10% GST. Any ideas of how to do this.
This is what I have so far - any help would be appreciated:
namespace Groceries1
{
class Program
{
static void Main(string[] args)
{
groceryItem mygroceryItem = new groceryItem();
mygroceryItem.play();
purchasedItem mypurchasedItem = new purchasedItem();
}
class groceryItem
{
private string myName = 0;
private int myPrice = 0;
public string Name
{
get
{
return myName;
}
set
{
myName = value;
}
}
public int Price
{
get
{
return myPrice;
}
set
{
myPrice = value;
}
}
}
class purchasedItem
{
private int myquantity = 0;
public int quantity
{
get
{
return myquantity;
}
set
{
myquantity = Price*quantity*1.1;
}
}
}
}
}

Answer 1

You can try this,
using System;
using System.Collections.Generic;
namespace Groceries
{
public class Program
{
public static void Main(string[] args)
{
FreshGrocery freshGrocery = new FreshGrocery();
freshGrocery.Name = "Fresh grocery";
freshGrocery.Price = 30;
freshGrocery.Weight = 0.5;
Grocery grocery = new Grocery();
grocery.Name = "Grocery";
grocery.Price = 50;
grocery.Quantity = 2;
ShoppingCart cart = new ShoppingCart();
cart.Orders = new List<GroceryItem>();
cart.Orders.Add(freshGrocery);
cart.Orders.Add(grocery);
double price = cart.Calculate();
Console.WriteLine("Price: {0}", price);
}
}
abstract class GroceryItem
{
private string name;
private double price = 0;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
public double Price
{
get
{
return price;
}
set
{
price = value;
}
}
public abstract double Calculate();
}
class FreshGrocery: GroceryItem
{
private double weight = 0;
public double Weight
{
get
{
return weight;
}
set
{
weight = value;
}
}
public override double Calculate() {
return this.Price * this.Weight;
}
}
class Grocery: GroceryItem
{
private int quantity = 0;
private double gst = 10; // In Percentage
public int Quantity
{
get
{
return quantity;
}
set
{
quantity = value;
}
}
public override double Calculate() {
double calculatedPrice = this.Price * this.Quantity;
// VAT
if(calculatedPrice > 0)
{
calculatedPrice += calculatedPrice * (gst/100);
}
return calculatedPrice;
}
}
class ShoppingCart
{
private List<GroceryItem> orders;
public List<GroceryItem> Orders
{
get
{
return orders;
}
set
{
orders = value;
}
}
public double Calculate()
{
double price = 0;
if(this.Orders != null)
{
foreach(GroceryItem order in this.Orders)
{
price += order.Calculate();
}
}
return price;
}
}
}