cc: Console.Write("輸入年份：");
            int year = int.Parse(Console.ReadLine());
            Console.Write("輸入月份：");
            int month = int.Parse(Console.ReadLine());
            Console.Write("輸入日期：");
            int day = int.Parse(Console.ReadLine());
            if (year >= 1900
 
 && month > 0 && month < 13 && day > 0 && day < 32)
            {
                if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                {
                    Console.WriteLine("{0}年是閏年", year);
                }
                else
                {
                    Console.WriteLine("{0}年是平年"
 
, year);
                }
                int[] lyear = new int[] { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };//閏年
                int[] cyear = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };//平年
                int nowday = 0;
                if (year % 4 == 0 && year % 100 != 0 || year % 400
 
 == 0)
                {
                    for (int i = 0; i < month; i++)
                    {
                        if (i != month - 1)
                        {
                            nowday += lyear[i];
                        }
                        else
                        {
                            nowday += day;
                        }
                    }
                }
                else
                {
                    for (int i = 0; i < month; i++)
                    {
                        if (i != month - 1)
                        {
                            nowday += cyear[i];
                        }
                        else
                        {
                            nowday += day;
                        }
                    }
                }
                int agoday = 0;
                for (int i = 1900; i<year; i++)
                {
                    if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0)
                    {
                        agoday += 366;
                    }
                    else
                    {
                        agoday += 365;
                    }
                }
                int sumday = agoday + nowday;
                int week = sumday%7;
                switch (week)
                {
                    case 1:
                        Console.WriteLine("星期一");
                        break;
                    case 2:
                        Console.WriteLine("星期二");
                        break;
                    case 3:
                        Console.WriteLine("星期三");
                        break;
                    case 4:
                        Console.WriteLine("星期四");
                        break;
                    case 5:
                        Console.WriteLine("星期五");
                        break;
                    case 6:
                        Console.WriteLine("星期六");
                        break;
                    case 0:
                        Console.WriteLine("星期日");
                        break;
                    default:
                        break;
                }
                Console.ReadKey();
            }
            else
            {
                Console.WriteLine("輸入有誤！");
                goto cc;
            }