编写一个控制台应用程序,要求用户输入 5 个大写字母,如果用户输入的信息不满足要求,提示帮助信息并要求重新输入。
class Program { static void Main(String[] args) { while (true) { Console.WriteLine("pleace input 5 uppercase letters:"); string s = Console.ReadLine(); char[] c = s.ToCharArray(); bool flag = true; if(c.Length == 5) { for(int i = 0; i< 5; i++) { if ((int)c[i] < 65 || (int)c[i] > 90) { flag = false; Console.WriteLine("Your input does not meet the requirements, please re-enter!"); break; } } } else { flag = false; Console.WriteLine("Your input does not meet the requirements, please re-enter!"); } if (flag) { Console.WriteLine("ok!"); break; } } Console.ReadKey(); } }