使用C#语言，VS控制台输出日历

思路：将年历拆分为12个月历实现

在每个月历中，判断每个月的天数，同时通过年月日判断星期数，每逢周六换行打印输出。其中对于2月，需要判断是否为闰年。

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

namespace Days03
{
    internal class Program
    {
        //判断月的天数
        private static int countDaysOfMonth(int year,int mouth)
        {
            int count = 0;
            switch (mouth)
            {

                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    count = 31;
                    break;
                case 4:
                case 6:
                case 9:
                case 11:
                    count = 30;
                    break;
                case 2:
                    count = runYearOrPin(year);
                    break;
            }
            return count;
        }


        //判断是否闰年
        private static int runYearOrPin(int year)
        {
            if(year%400==0||(year%4==0&&year%100!=0))
            {
                return 29;
            }
            else
            {
                return 28;
            }
        }
        //判断是否闰年方法2
        private static bool leapYear(int year)
        {
            return (year % 400 != 0 && (year % 4 == 0 && year % 100 != 0));
        }


        //根据年月日计算星期几
        /// <summary>
        /// 根据年月日计算星期数的方法
        /// </summary>
        /// <param name="year">年数</param>
        /// <param name="month">月数</param>
        /// <param name="day">天数</param>
        /// <returns></returns>
        private static int GetWeekByDay(int year,int month,int day)
        {
            DateTime dt = new DateTime(year, month, day);
            return (int)dt.DayOfWeek;
        }


        //控制台实现月历
        private static void monthOutput(int year, int month)
        {
            //表头
            Console.WriteLine("{0}年{1}月", year, month);
            Console.WriteLine("日\t一\t二\t三\t四\t五\t六\t");
            Console.WriteLine("\n");

            //计算每月1号星期几 输出空格
            int week = GetWeekByDay(year, month, 1);
            for (int i = 1;i<= week;i++)
            {
                Console.Write("\t");
            }

            //计算当月天数  输出1 2 3....
            int days = countDaysOfMonth(year, month);
            for(int i=1;i<=days;i++)
            {
                Console.Write(i + "\t");
                //每逢周六换行
                if(GetWeekByDay(year,month,i)==6)
                {
                    Console.WriteLine("\n");
                }
            }
            Console.WriteLine("\n");

        }

        //打印年历
        private static void printYearCalendar(int year)
        {
            for(int i=1;i<=12;i++)
            {
                monthOutput(year, i);
            }
        }
        static void Main()
        {
            Console.WriteLine("请输入年份：");
            int year = int.Parse(Console.ReadLine());
            printYearCalendar(year);
        }
    }
}