C++ 友元函数

#include "Lisi.h"
#include "Wangwu.h"
class Zhangsan {
    //友元类
    friend class Wangwu;
    //友元成员函数
    friend void Lisi::jz();
    //友元全局函数

    friend void huaqian2();
public:
    int age;
private:
    int money;
public:
    Zhangsan();

    Zhangsan(int money);

    Zhangsan(int age, int money);

    ~Zhangsan();

};

#include "Zhangsan.h"

Zhangsan::Zhangsan() {}

Zhangsan::Zhangsan(int money) : money(money) {}

Zhangsan::Zhangsan(int age, int money) : age(age), money(money) {}

Zhangsan::~Zhangsan() {}

class Lisi {
public:
    void chwl();
    void jz();

};

#include "Lisi.h"
#include "Zhangsan.h"

void Lisi::chwl() {
    Zhangsan zs;
    zs.age =10;
    //zs.money =100;
}
void Lisi::jz() {
    Zhangsan zs;
    zs.age =10;
    zs.money =100;
}

Wangwu.h

class Wangwu {
public:
    void htjd();


    void hj();

};

Wangwu.cpp

#include "Wangwu.h"
#include "Zhangsan.h"
void Wangwu::hj() {
    Zhangsan zs;
    zs.age = 20;
    zs.money=2000;

}

void Wangwu::htjd() {
    Zhangsan zs;
    zs.age = 20;
    zs.money=2000;
}

Test.cpp

#include 
#include "Zhangsan.h"

using namespace std;
void huaqian1(){
    cout<<"全局函数"<