第一次实验参考代码

第一次实验参考代码，仅供参考

//********************************
//*******Class:Date***************
//*******2010.10.22***************
//*******By Tea_Duan**************
//********************************
#include <iostream.h>
#include <stdlib.h>

//Global variable
int days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};//days of month
char *Week[7]={"Sunday","Monday","Tuesday","Wednesday","Thurday","Friday","Saturday"};  //Week

class Date{//class defination
public:
	void SetDate(int,int,int);// initialization
	int IsLeapyear(int );  //Leap year or not
	int Week_day(int);  //Week_day
	void Show();  //days number
private:
	int year,month,day;
};

void Date::SetDate(int y,int m,int d)
{
	year=y;
	month=m;
	day=d;
	if(year<=0||month<=0||day<=0||month>12||day>days[month])  //Date validity check
	{
		cout<<"The Date is invalid!"<<endl;
		exit(0);
	}
}

int Date::IsLeapyear(int y)
{
	return y%4==0&&y%100!=0||y%400==0;
}

int Date::Week_day(int flag)  
//flag 0:week 1:day_num;
{
	long sum=0;
	int i;
	if(flag==0)
		i=1;
	else
		i=year;
	for(;i<year;i++)
	{
		if(IsLeapyear(i))
			sum+=366;
		else
			sum+=365;
	}
	for(int j=1;j<month;j++)
		sum+=days[j];
	if(month>2 && IsLeapyear(year))
		sum++;
	sum+=day;
	if(flag==0)
		return sum%7;
	return sum;
};

void Date::Show()
{
	cout<<"The Date is:"<<year<<"-"<<month<<"-"<<day<<endl;
	cout<<"It's "<<*(Week+Week_day(0))<<endl;
	cout<<"It's "<<Week_day(1)<<" days of this year!"<<endl;
}

void main()
{
	Date D;
	int y,m,d;
	cout<<"Please input the Date:"<<endl;
	cin>>y>>m>>d;
	D.SetDate(y,m,d);
	D.Show();
}

说明：全局数组days定义了13个变量，其中下标为0的没有使用，以便于下标可以直接使用month，增加程序可读性