static void Main(string[] args) { MyClass mc = new MyClass(); TestTwo4 tt = new TestTwo4(); int num; num = mc.CountChar("6221982", '2'); Console.WriteLine(num); /* * string str; * int i = 123456; * str = i.ToString(); * str = tt.Reconver(str); * Console.WriteLine("元数据是:" + i); * Console.Write("逆序输出:"); * Console.WriteLine(str); */ Console.ReadKey(); }