Kasir

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

namespace Kasir
{
    class Program
    {
        static void Main(string[] args)
        {
            string start;
            do
            {
                Console.Clear();
                int qty, i, kb, h, bay;
                float dis, ttl;
                string nm, cb;
                char pil;
                i = 0;
                dis = 0;
                Console.WriteLine(); Console.WriteLine();
                Console.WriteLine("\t ==== WELCOME !!!! ====");

              //INPUT
                Console.WriteLine();
                Console.WriteLine("\t Data ke - {0}", i + 1);
                Console.Write("\t Input Kode Barang \t  = ");
                kb = Convert.ToInt32(Console.ReadLine());
                pilihan:
                Console.Write("\t Input Jenis Barang (A-D) = ");
                pil = char.Parse(System.Console.ReadLine());
                switch (pil)
                {
                    case 'a':
                    case 'A':
                        nm = "Baju Kemeja";
                        h = 50000;
                        break;
                    case 'b':
                    case 'B':
                        nm = "Celana Panjang";
                        h = 70000;
                        break;
                    case 'c':
                    case 'C':
                        nm = "Topi";
                        h = 80000;
                        break;
                    case 'd':
                    case 'D':
                        nm = "Sepatu";
                        h = 100000;
                        break;
                    default:
                        Console.WriteLine("\t Tidak ada pilihan selain A-D");
                        goto pilihan;
                }
                Console.Write("\t Input Jumlah Beli \t  = ");
                qty = Convert.ToInt32(Console.ReadLine());
                bay = h * qty;
                switch (qty > 5)
                {
                    case true:
                        dis = bay * 0.1f;
                        break;
                    case false:
                        dis = 0;
                        break;
                }
                cb = qty > 5 ? "10%" : "-";
                ttl = bay - dis;

                //OUTPUT
                Console.WriteLine(); Console.WriteLine();
                Console.WriteLine("\t ==== NOTA PEMBELIAN ====");
                Console.WriteLine();
                Console.WriteLine("\t Kode Barang " + kb + " Nama Barang " + nm);
                Console.WriteLine("\t Harga Barang \t = " + h);
                Console.WriteLine("\t Jumlah Beli \t = " + qty);
                Console.WriteLine("\t Jumlah Bayar \t = " + bay);

                Console.WriteLine("\t Diskon \t = " + cb);
                Console.WriteLine("\t Total \t\t = " + ttl);
                Console.Write("\t Coba Lagi (Y/N) = ");
                start = Console.ReadLine();
                i++;
            } while (start == "y" || start == "Y");
        }
    }
}