输入4个数字，显示它们的乘积

 int param1, param2, param3, param4;
            param1 = Convert.ToInt32(Console.ReadLine());
            param2 = Convert.ToInt32(Console.ReadLine());
            param3 = Convert.ToInt32(Console.ReadLine());
            param4 = Convert.ToInt32(Console.ReadLine());
            Console.Write("他们的乘积是{0}",param1*param2*param3*param4);
            Console.ReadKey();