demo_constructor_02.cpp

对于一个初涉VC＋＋的人来书

//***************************************************

# include <iostream.h>

class Tdate
{
public:
	Tdate();  
	Tdate(int d);
	Tdate(int m,int d);
	Tdate(int m,int d,int y);
	//重载构造函数,根据函数声明中的参数选择合适的构造函数

protected:
	int month;
	int day;
	int year;
};

//构造函数定义
Tdate::Tdate()  
{
	month=1;
	day=23;
	year=2005;
	cout<<month<<"/"<<day<<"/"<<year<<endl;
}

Tdate::Tdate(int d)
{
	month=2;
	day=d;
	year=2005;
	cout<<month<<"/"<<day<<"/"<<year<<endl;
}

Tdate::Tdate(int m,int d)
{
	month=m;
	day=d;
	year=2005;
	cout<<month<<"/"<<day<<"/"<<year<<endl;
}

Tdate::Tdate(int m,int d,int y)
{
	month=m;
	day=d;
	year=y;
	cout<<month<<"/"<<day<<"/"<<year<<endl;
}

void main()
{
	Tdate aday;
	Tdate bday(23);
	Tdate cday(3,23);
	Tdate dday(4,23,2005);
}