学习C#写的第二个学期作业，这次用到CLASS & OBJECT

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Project
{
    class Delivery
    {
        int deliveryCode; //CODE OF DELIVERY REQUEST
        int warehouseCode;
        int customerCode;
        int vehicleCode;
        public Item item;

        public Delivery(int NO_OF_DELIVERY_REQUEST, int warehouseCode, int customerCode, int vehicleCode, string itemCode, string itemDescription, int itemQty, float unitCost, int k)
        {
            this.deliveryCode = NO_OF_DELIVERY_REQUEST;
            this.warehouseCode = warehouseCode;
            this.customerCode = customerCode;
            this.vehicleCode = vehicleCode;
            item = new Item(itemCode, itemDescription, itemQty, unitCost);
        }
        public int GetDeliveryCode()
        {
            return deliveryCode;
        }
        public int GetWarehouseCode()
        {
            return warehouseCode;

        }
        public int GetCustomerCode()
        {
            return customerCode;
        }
        public int GetVehicleCode()
        {
            return vehicleCode;
        }
    }
    class Vehicle
    {
        string driverName;
        string vehicleModel;
        string vehicleNo;

        public Vehicle()
        {
            driverName = "N/A";
            vehicleModel = "N/A";
            vehicleNo = "N/A";
        }
        public void Update(int code)
        {
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("Update Vehicle {0}", code);
            Console.ResetColor();
            do
            {
                Console.Write("Enter Driver Name (4-8 characters): ");