W3School TIY Editor

#include <iostream> using namespace std; class Employee { private: int salary; public: Employee(int s) { salary = s; } // 声明友元函数 friend void displaySalary(Employee emp); }; void displaySalary(Employee emp) { cout << "薪水：" << emp.salary; } int main() { Employee myEmp(50000); displaySalary(myEmp); return 0; }