3-25.txt

思路很清晰的c++课件。例子很简明

例3.25 boy为girl的友元类

#include <iostream.h>
#include <string.h>

class girl;

class boy{
	char *name;
	int age;
public:
	boy(char *n,int d)
	{	name=new char[strlen(n)+1];
		strcpy(name,n);
		age=d;
	}
	void disp(girl &);		//声明disp()为类boy的成员函数
	~boy(){delete name;}
};

class girl{
	char *name;
	int age;
	friend boy;			//声明类boy是类girl的友元
public:
	girl(char *n,int d)
	{	name=new char[strlen(n)+1];
		strcpy(name,n);
		age=d;
	}
	~girl(){delete name;}
};

void boy::disp(girl &x)		//定义函数disp()为类boy的成员函数，也是类girl的友元函数
{	cout<<"boy\'s name is:"<<name<<",age:"<<age<<endl;
	cout<<"girl\'s name is:"<<x.name<<",age:"<<x.age<<endl;
}

void main()
{	boy b("chen hao",25);
	girl g("zhang wei",18);
	b.disp(g);
}