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C++多态性程序例子

#include <iostream.h>
#include <string.h>
#include <stdio.h>
typedef char string80[80];

class Date
{
public:
	Date() {}
	Date(int y, int m, int d) { SetDate(y, m, d); }
	void SetDate(int y, int m, int d)
	{
		Year = y;
		Month = m;
		Day = d;
	}
	void GetStringDate(string80 &Date)
	{
		sprintf(Date, "%d/%d/%d", Year, Month, Day);
	}
protected:
	int Year, Month, Day;
};

class Time
{
public:
	Time() {}
	Time(int h, int m, int s) { SetTime(h, m, s); }
	void SetTime(int h, int m, int s)
	{
		Hours = h;
		Minutes = m;
		Seconds = s;
	}
	void GetStringTime(string80 &Time)
	{
		sprintf(Time, "%d:%d:%d", Hours, Minutes, Seconds);
	}
protected:
	int Hours, Minutes, Seconds;
};

class TimeDate:public Date, public Time
{
public:
	TimeDate():Date() {}
	TimeDate(int y, int mo, int d, int h, int mi, int s):Date(y, mo, d), Time(h, mi, s) {}
	void GetStringDT(string80 &DTstr)
	{
		sprintf(DTstr, "%d/%d/%d;%d:%d:%d", Year, Month, Day, Hours, Minutes, Seconds);
	}
};

void main()
{
	TimeDate date1, date2(1998, 8, 12, 12, 45, 10);
	string80 DemoStr;
	date1.SetDate(1998, 8, 7);
	date1.SetTime(10, 30, 45);
	date1.GetStringDT(DemoStr);
	cout<<"The date1 date and time is:"<<DemoStr<<endl;
	date1.GetStringDate(DemoStr);
	cout<<"The date1 date is:"<<DemoStr<<endl;
	date1.GetStringTime(DemoStr);
	cout<<"The date1 time is:"<<DemoStr<<endl;
	date2.GetStringDT(DemoStr);
	cout<<"The date2 date and time is:"<<DemoStr<<endl;
}