using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        //定义方法一
        public static void PrintInfo()
        {
            Console.WriteLine("Hello World! \n I'm Coming!");
        }
        //定义方法二
        public static void Check(int imput_date)
        {
            /*
            int imput_date;
            Console.WriteLine("Please input date:");
            imput_date = Console.Read();
            */
            switch (imput_date) 
            {
                case 0:
                    Console.WriteLine("今天是星期1");
                    break;
                case 1:
                    Console.WriteLine("今天是星期2");
                    break;
                case 2:
                    Console.WriteLine("今天是星期3");
                    break;
                case 3:
                    Console.WriteLine("今天是星期4");
                    break;
                case 4:
                    Console.WriteLine("今天是星期5");
                    break;
                case 5:
                    Console.WriteLine("今天是星期6");
                    break;
                case 6:
                    Console.WriteLine("今天是星期7");
                    break;
                default:
                    Console.WriteLine("请输入正确的日期!");
                    break;

            }
        }
        static void Main(string[] args)
        {
            //使用方法:
            PrintInfo();
            Check(0);
            Check(1);
            Check(2);
            Check(5);
            Check(8);
            Console.Read();
        }
    }
}

运行结果如下: