题目描述：
引入头文件ClockAndDate.h，它的内容如下：
#include <iostream>
using namespace std
;
class Clock{
public:
Clock(int h
,int m
,int s
){
hour
=(h
>23? 0:h
);
minute
= (m
>59?0:m
);
second
= (s
>59?0:m
);
}
virtual void run(){
second
= second
+1;
if (second
>59)
{
second
=0;
minute
+=1;
}
if (minute
>59)
{
minute
=0;
hour
+=1;
}
if (hour
>23)
{
hour
=0;
}
}
virtual void showTime(){
cout
<<"Now:"<<hour
<<":"<<minute
<<":"<<second
<<endl
;
}
int getHour(){return hour
;}
int getMinute(){return minute
;}
int getSecond(){return second
;}
Clock
* createClockWithDate(int h
,int m
,int s
,int year
,int month
,int day
);
protected:
int hour
;
int minute
;
int second
;
};
class Date{
public:
Date(int y
=1996,int m
=1,int d
=1){
day
=d
;
year
=y
;
month
=m
;
if (m
>12||m
<1)
{
m
=1;
}
if(d
>days(y
,m
)){
day
= 1;
}
};
int days(int year
,int month
);
void NewDay();
void display(){
cout
<<year
<<"-"<<month
<<"-"<<day
<<endl
;
}
protected:
int year
;
int month
;
int day
;
};
需要实现Date类的days方法，根据年和月，返回该年该月对应的天数 实现Date类的NewDay方法，该方法将Date代表的日期增加一天。
实现ClockWithDate类，它继承至Clock类和Date类，记录时间和日期 重新实现ClockWithDate类的showTime方法和run方法。 showTime方法输出当的时间和日期，先输出时间再输出日期。 run方法每次将现在的时间增加一秒，并且当时间超过23：59：59时，更新日期。
必须实现Clock类的createClockWithDate方法，它的实现必须在ClockWithDate类的定义之后，它的内容如下：
Clock
* Clock
::createClockWithDate(int h
,int m
,int s
,int year
,int month
,int day
){
return new ClockWithDate(h
,m
,s
,year
,month
,day
);
}
实现：
#include"ClockAndDate.h"
int Date
::days(int year
, int month
)
{
int monthsInLeapYear
[12] = { 31,29,31,30,31,30,31,31,30,31,30,31 };
int monthsInNormalYear
[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
if ((year
% 4 == 0 && year
% 100 != 0) || year
% 400 == 0)
return monthsInLeapYear
[month
- 1];
else
return monthsInNormalYear
[month
- 1];
}
void Date
::NewDay()
{
int m_d
[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
day
++;
switch (month
)
{
case 2:
if (year
% 4 == 0 && year
% 100 != 0 || year
% 400 == 0)
{
if (day
> 29)
{
day
= 1; month
= 3;
}
}
else
{
if (day
> 28)
{
day
= 1; month
= 3;
}
}
break;
default:
if (day
> m_d
[month
- 1])
{
day
= 1; month
++;
}
break;
}
if (month
> 12)
{
month
= 1; year
++;
}
}
class ClockWithDate :public Clock
, public Date
{
public:
ClockWithDate(int h
, int m
, int s
, int year
, int month
, int day
):Clock(h
,m
,s
),Date(year
,month
,day
){}
virtual void showTime()
{
cout
<< "Now:" << hour
<< ":" << minute
<< ":" << second
<< endl
<< year
<< "-" << month
<< "-" << day
<< endl
;
}
virtual void run()
{
second
= second
+ 1;
if (second
> 59)
{
second
= 0;
minute
+= 1;
}
if (minute
> 59)
{
minute
= 0;
hour
+= 1;
}
if (hour
> 23)
{
hour
= 0;
NewDay();
}
}
};
Clock
* Clock
::createClockWithDate(int h
, int m
, int s
, int year
, int month
, int day
) {
return new ClockWithDate(h
, m
, s
, year
, month
, day
);
}
