class class1
    {
        public static void Main()
        {
            int a;
            Console.WriteLine("输入一个数");
            a = Convert.ToInt32(Console.ReadLine());
           
            if (a % 2 == 0)
                Console.WriteLine("这个数为偶");
            else
            {
                Console.WriteLine("这个数为奇数");
            }
            Console.ReadLine();
        }
    }

我学生啊!
刚学这不久 谢谢你门咯

Console.ReadLine()
是显示控制台