3-21.txt

思路很清晰的c++课件。例子很简明

例3.21 使用静态成员函数访问静态数据成员

#include <iostream.h>
class small_cat{
private:
	double weight;
	static double total_weight;	//静态数据成员
	static double total_number;	//静态数据成员
public:
	small_cat(double w)
	{	weight=w;
		total_weight+=w;
		total_number++;
	}
	void display()
	{
		cout<<"小猫的重量是："<<weight<<"磅"<<endl;
	}

	static void total_disp()	//静态成员函数
	{
		cout<<total_number<<"只小猫总重是："<<total_weight<<"磅"<<endl;
	}
};

double small_cat::total_weight=0;
double small_cat::total_number=0;

void main()
{	small_cat w1(1.8),w2(1.6),w3(1.5);
	w1.display();
	w2.display();
	w3.display();
	small_cat::total_disp();	//通过类调用静态成员函数
}