定義日期類Date。要求：
（1）可以設定日期；
（2）日期加一天操作；
（3）輸出函式，輸出格式為“XXXX-XX-XX”；
（4）編寫主函式，定義物件，完成相應功能。
程式的參考的輸入（“Input Date:”為提示文字）：
Input Date:2016 2 28
程式的輸出：
2016-2-28
2016-2-2

本程式是由 QTCreator在linux作業系統下完成的，僅供參考

Date類的標頭檔案

#ifndef CDATE_H
#define CDATE_H
class CDate
{
private:
    int year;
    int month;
    int day;
    int YearNL[12]= {31,28,31,30,31,30,31,31,30,31,30,31};
    int YearL[12]={31,29,31,30,31,30,31,31,30,31,30,31};
    char WhileFlag = 'n';  //set a WhileFlag to deal error input
    char flagleap='n';
public:  
    //void SetDate(int year, int month, int day);
    void SetDate();
    void AddDate();
    void GetDate();
    char LeapYear();
};
#endif // CDATE_H
 

Date類的實現

#include "cdate.h"
#include <iostream>
using namespace std;

char CDate::LeapYear()
{
    if(( 0 == year%400 ) || ( 0 == year %4&& 0!= year%100 ))
    {
        cout<<year<<" is a leap year "<<endl<<endl;
        //if the year is a leap year then check it with YearL[]
        if(day > YearL[month-1])
        {
            cout <<"invalid value ! input again "<<endl<<endl;
            return WhileFlag = 'n';
        }
        //return the WhileFlag
        else
        {
            return WhileFlag ='y',flagleap='y';
        }
    }
    //if the year is not a leap year then check it with YearNL[]
    else
    {
        if(day > YearNL[month-1])
        {
            cout <<"invalid value ! input again "<<endl<<endl;
            return WhileFlag = 'n';
        }
        //return the WhileFlag
        else
        {
            return WhileFlag ='y';
        }
    }
}
void CDate::SetDate()
{
    while(WhileFlag == 'n')
    {
        cout <<"Please input [ year month day ]:";
        cin >>year>>month>>day;
        this->year = year;
        this->month = month;
        this->day = day;
        cout<<endl<<"Yourinput:"<<year<<"-"<<month<<"-"<<day<<endl<<endl;
		LeapYear();
    }
}
//add one day
void CDate ::AddDate()
{
    //if user input a leap year and the day is 29 ,the tomorrow day will be change
    if(( 'y' == flagleap ) && ( day == YearL[month-1] ))
    {
        day = 1;
        cout << "Tomorrow is:"<<year<<"-"<<month+1<<"-"<<day<<endl;
    }
    //else output directly
    else if(day == YearNL[month-1]) //if the day is the end of month,then set the day=1 
     {
        day = 1;
        cout << "Tomorrow is:"<<year<<"-"<<month+1<<"-"<<day<<endl<<endl;
    }
    else //else it can add directly
    {
        cout << "Tomorrow is:"<<year<<"-"<<month<<"-"<<day+1<<endl<<endl;
    }
}
//get the date
void CDate::GetDate()
{
    SetDate();	//call the Set() to set date
    cout<<"The date is:"<<year<<"-"<<month<<"-"<<day<<endl;
    AddDate();
}
 

Main函式

#include <iostream>
#include "cdate.h"
using namespace std;
int main()
{   
    CDate Date1;       //creat a object Date1
    Date1.GetDate();		//call the Get method to obtain date
    return 0;
}

執行結果：
為了區別瑞年和平年，我輸入了1880 的2月 29日；如圖顯示

輸入的2018年的10月16日：