日历制作

该程序有如下功能：

• 输入年和月，输出日历。
• 输入年月日，输出这是该年的第几天。

using System;

namespace MyBase
{
    public class calendar
    {
        int year, month;
        char[]  weekday=new char[7]{'日','一','二','三','四','五','六'};
        int dayofmonth(int year,int month)
        {
            if (month == 2)
            {
                if (isleapyear(year) == true) return 29; else return 28;
            }
            else
                if (month == 4 || month == 6 || month == 9 || month == 11)
                {
                    return 30;
                }else{
                    return 31;
                }
        }
        public static bool isleapyear(int year)
        {
            if(year%400 ==0 )return true;
            if (year % 4 == 0 && year % 100 != 0) return true;
            return false;
        }
        int calweekofday(int day)
        {
            DateTime timetemp = new DateTime(year, month, day);
            return (int)timetemp.DayOfWeek;
        }
        public calendar()
        {
            print("Input year:");
            year = int.Parse(read());
            print("Input month:");
            month = int.Parse(read());
            string keyinput;
            do
            {
                printcalendar();
                print("input q to quit!");
                keyinput = read();
                nextmonth();
            } while (keyinput != "q");

            computedayofyear();
        }
        void nextmonth()
        {
            if (month == 12) {
                year++;
                month = 1;
            }
            else
            {
                month++;
            }
        }
        void print(object mstr)
        {
            Console.WriteLine(mstr);
        }
        string read()
        {
            return Console.ReadLine();
        }
        //打印出日历来
        void printcalendar()
        {
            printyear();
            printweekday();
            printday3();
        }
        void printyear()
        {
            print(year+"年"+month+"月");
        }
        void printweekday()
        {
            string mix="";
            for (int i = 0; i < 7; i++)
                {
                    mix += weekday[i] + "\t";
                }
            print(mix);
        }
        void printday3()
        {
            string tempstr = "";
            int monthday = dayofmonth(year, month);
            int firstlinebegin = calweekofday(1);
            for (int i = 0; i < 7; i++)
            {
                if (i < firstlinebegin)
                    tempstr += "\t";
            }
            Console.Write(tempstr);
            for (int i = 1; i <= monthday; i++)
            {
                Console.Write(i+"\t");
                if (calweekofday(i) == 6) Console.WriteLine();
            }
            Console.WriteLine();
        }
        void printday2()
        {
            string tempstr = "";
            int monthday = dayofmonth(year, month);
            int pointpos = calweekofday(1);
            int pos = 1;
            do{

                if (pos < pointpos+1)
                {
                    tempstr += "\t";
                }
                else
                {
                    tempstr += (pos-pointpos) + "\t";
                }
                
                if (pos % 7 == 0)
                {
                    print(tempstr);
                    tempstr = "";
                }
                pos++;
            }while(pos<monthday+pointpos+1);
            print(tempstr);
        }
        void printday()
        {
            string tempstr="";
            int monthday = dayofmonth(year, month);
            int firstlinebegin = calweekofday(1);
            int firstlineday = 1;
           
            for (int i = 0; i < 7; i++)
            {
                if (i < firstlinebegin)
                    tempstr += "\t";
                else
                    tempstr += firstlineday++ + "\t";
            }
            print(tempstr);

            int tempfinal= (monthday - firstlineday) / 7;
            for (int i = 0; i <tempfinal; i++)
            {
                tempstr = "";
                for(int j=0;j<7;j++){
                    tempstr += firstlineday++ + "\t";
                }
                print(tempstr);
            }
           

            tempstr="";
            tempfinal = (monthday - firstlineday) % 7;
            for (int i = 0; i <= tempfinal ; i++)
            {
                tempstr += firstlineday++ + "\t";
            }
            print(tempstr);
        }
        //输入年月日，计算这是一年中的第几天
        public void computedayofyear()
        {
            int year, month, day;
            Console.WriteLine("input year:");
            year = int.Parse(Console.ReadLine());
            Console.WriteLine("input month:");
            month = int.Parse(Console.ReadLine());
            Console.WriteLine("input day:");
            day = int.Parse(Console.ReadLine());
            int[] dayofmonth = new int[12] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
            if (isleapyear(year) == true) dayofmonth[1] = 29;
            int tempday = 0;
            for (int i = 0; i < month - 1; i++)
            {
                tempday += dayofmonth[i];
            }
            tempday += day;
            Console.WriteLine("this day is in {0} day in this year", tempday);
        }
    }
}