class Program
    {
        static void Main(string[] args)
        {
            //int b;
            //string a;
            //a = Console.ReadLine();
            //b = int.Parse(a);
            //Console.WriteLine("{0}", a);

            int b;
            string a;
            a = Console.ReadLine();
            if (int.TryParse(a, out b))//这里就是转换变量a是字符串,out是关键字,b是接收变量,返回值为bool类型,true_成功,false_失败
            {
                Console.WriteLine("{0}", b);//这里应该是输出转换后的值
            }
            else {
                Console.WriteLine("输入的格式不正确");
            }
            Console.ReadKey();
        }
    }