万年历

#include<iostream>
#include<iomanip>

using namespace std;

void main()
{
	int monthDay[12] = { 31,0,31,30,31,30,31,31,30,31,30,31 }; //确定每个月的天数

		cout << "please enter the year" << endl;
	int year;
	cin >> year;

	if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
		monthDay[1] = 29;
	else
		monthDay[1] = 28;                                 //判断是否为闰年

		int startDay;
	startDay = ((year - 1) + (year - 1) / 4 - (year - 1) / 100 + (year - 1) / 400 + 1) % 7; //判断这一年第一天是星期几
		//cout << startDay << endl;

	int count = 1;
	int day = 1;
	int temp;
	for (int i = 0; i < 12; i++)
	{
		cout << "Mon   Tue   Wed   Thu   Fri   Sat   Sun" << endl; //打印每个月的星期
			while (count<startDay)
			{
				cout << setw(6) << "     ";                        //每个月开始空的几天放空格
					count++;
			}
		while (day <= monthDay[i])                                  //判断日期是否超过当月天数
		{
			while (count <= 7)				     //判断是否超出一周7天
			{
				if (day <= monthDay[i])
				{
					cout << setw(3) << day << "   ";     //对齐
						day++;
					count++;
					temp = count;
				}
				else                                          // 完成这一周的打印强制退出
				{
					temp = count;
		count = 8;
				}
			}
		cout << endl;                                          //一周换行
			count = 1;
		}
		cout << endl;                                                   //一月换行
			day = 1;                                                       //一个月结束重置日期
			startDay = temp;
	}
}