写了一个用类实现输入年月日，判断这一天是这一年第几天 - 黑马程序员技术交流社区

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace exam2
{
class Date
{
protected string year;
protected string month;
protected string day;
protected string InitYear(string yy) //初始化年
{
this.year = yy;
return this.year;
}
protected string InitMonth(string yy) //初始化月
{
this.month = yy;
return this.month;
}
protected string InitDay(string yy) //初始化年
{
this.day = yy;
return this.day;
}
protected bool IsRuiNian(string yy) //判断是不是闰年
{
int YY=int.Parse(yy);
if (YY % 400 == 0 || (YY % 4 == 0 && YY % 100 == 0))
return true;
else
return false;
}
protected int[,] GetMonth(string year) //获得月份的天数
{
int[,] Mounth = { {1,31},{2,28},{3,31},{4,30},{5,31},{6,30},{7,31},{8,31},{9,30},{10,31},{11,30},{12,31}};
if (IsRuiNian(year))
Mounth[1,1] = 29;
return Mounth;
}
public int GetDays(string year, string month, string day)//计算总天数
{
int SumDay = int.Parse(day);//总天数
int [,]Mounth = this.GetMonth(year);
int mm = int.Parse(month);
for (int i = 1; i < mm;i++ )//计算从1月到输入的月份的天数
{
SumDay += Mounth[i, 1];
}
return SumDay;
}
}
class Program
{
//输入某年某月某日，判断这一天是这一年的第几天？
static void Main(string[] args)
{
Date date=new Date();
Console.Write("年：");
string year = Console.ReadLine();
Console.Write("月：");
string month = Console.ReadLine();
Console.Write("日：");
string day = Console.ReadLine();
Console.WriteLine(string.Format("{0}年{1}月{2}日是第{3}天：", year, month, day, date.GetDays(year, month, day)));//用Format格式化输出
Console.ReadKey();
}
}
}

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