面向对象第一次实验参考代码

#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();
} 

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