class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("please input a string");
            string a = Convert.ToString(Console.ReadLine());
            string b = Convert.ToString(Console.ReadLine());
            int i = 0;
          try
           {
                    Console.WriteLine("a+b= {0} + {1}={2}", a, b, a+b);
                }
                catch (FormatException)
                {
                    Console.WriteLine("输入不是整数");
                }
                catch (DivideByZeroException)
                {
                    Console.WriteLine("捕获到了除错误");
                }
                Console.WriteLine("继续");
                Console.ReadKey();
            }
        }