public static void Main()
Console.WriteLine("請輸入使用者名稱:"); string username,password;
username = Console.ReadLine();
Console.WriteLine(username+"您好");
Console.WriteLine("請輸入密碼:"); password=Console.ReadLine();
if((password=="egg566")||(password=="EGG566"))
Console.WriteLine("歡迎進入本系統"); Console.WriteLine("密碼錯誤"); Console.WriteLine(username+"您好");
Console.WriteLine("請輸入密碼:"); password=Console.ReadLine();
if((password=="dog123")||(password=="DOG123"))
Console.WriteLine("歡迎進入本系統"); Console.WriteLine("密碼錯誤"); Console.WriteLine("本系統不認識"+username);
