using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace do_while

{

    class hotel

    {

        public static void Main(string[] args)

        {

            int ch, cost = 0, bill = 0, Tbill = 0, Qty;

            char c;

            do

            {

                Console.WriteLine("1.idly - 40");

                Console.WriteLine("2.dosa - 50");

                Console.WriteLine("3.vada - 60");

                Console.WriteLine("4.puri - 70");

                Console.WriteLine("enter your choice:");

                ch = Convert.ToInt32(Console.ReadLine());

                if (ch >= 1 && ch <= 4)

                {

                    if (ch == 1)

                    {

                        cost = 40;

                    }

                    else if (ch == 2)

                    {

                        cost = 50;

​

                    }

                    else if (ch == 3)

                    {

                        cost = 60;

                    }

                    else

                    {

                        cost = 70;

                    }

                }

                else

                {

                    Console.WriteLine("invaid choice");

                }

                if (ch>=1&&ch<=4)

                {

                    Console.WriteLine("enter quantity");

                     Qty = Convert.ToInt32(Console.ReadLine());

                     bill = Qty * cost;

                    Console.WriteLine("cost is:" + cost);

                    Console.WriteLine("bill is:" + bill);

                    Tbill = Tbill + bill;

                }

                Console.WriteLine("do want to continue(y/n)");

                    c = Convert.ToChar(Console.ReadLine());

            }

            while (c == 'y');

            Console.WriteLine("total bill is:" + Tbill);

            Console.ReadKey();

        }

    }

}

​