C#实现小小的日历 .

 

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

namespace CalendarConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入年月");
            int year = int.Parse(Console.ReadLine());
            int month = int.Parse(Console.ReadLine());
            int day = 0;
            int sum = 0;

            for(int i=1900;i
            {
                if(i%4==0&&i%100!=0||i%400==0)
                {
                    sum+=366;
                }
                else
                {
                    sum+=365;
                }
            }

            switch(month)
            {
                case 12:
                    day = 31;
                    break;
                case 11:
                    day = 30;
                    break;
                case 10:
                    day = 31;
                    break;
                case 9:
                    day = 30;
                    break;
                case 8:
                    day = 31;
                    break;
                case 7:
                    day = 31;
                    break;
                case 6:
                    day = 30;
                    break;
                case 5:
                    day = 31;
                    break;
                case 4:
                    day = 30;
                    break;
                case 3:
                    day = 31;
                    break;
                case 2:
                    if(year%4==0&&year%100!=0||year%400==0)
                        day = 29;
                    else
                        day = 28;
                    break;
                case 1:
                    day = 31;
                    break;
            }
            int leap;
            /*先计算某月以前月份的总天数*/
            switch (month)
            {
                case 1: sum += 0; break;
                case 2: sum += 31; break;
                case 3: sum += 59; break;
                case 4: sum += 90; break;
                case 5: sum += 120; break;
                case 6: sum += 151; break;
                case 7: sum += 181; break;
                case 8: sum += 212; break;
                case 9: sum += 243; break;
                case 10: sum += 273; break;
                case 11: sum += 304; break;
                case 12: sum += 334; break;
            }
            /*判断是不是闰年*/
            if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
                leap = 1;
            else
                leap = 0;
            /*如果是闰年且月份大于2,总天数应该加一天*/
            if (leap == 1 && month > 2)
                sum++;

            int space = (sum+1)%7;

            Console.WriteLine("日\t一\t二\t三\t四\t五\t六\t");

            for(int i=1;i<=space+day;i++)
            {
                if(i<=space)
                    Console.Write("\t");
                else
                    Console.Write(i-space+"\t");

                if(i%7 == 0)
                    Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
}