无法更改私有变量的内容

Question

main.cpp：

#include <iostream>
#include <string>
#include "Players.h"
using namespace std;

int main ()
{
    cout << "**** Welcome to Leviathan's first TicTacToe Game! ****\n\n";
    Players getNamesobject;
    Players printNamesobject;
    getNamesobject.getPlayersNames();
    printNamesobject.printPlayersNames();

}

Players.h：

#ifndef PLAYERS_H
#define PLAYERS_H


class Players
{
    public:
        void getPlayersNames();
        void printPlayersNames();
    private:
        std::string _player1Name;
        std::string _player2Name;
};

#endif // PLAYERS_H

Players.cpp：

#include <iostream>
#include <string>
#include "Players.h"
using namespace std;

void Players::getPlayersNames()
{
    string p1,p2;
    cout << "Enter player 1 name : ";
    cin >> p1;
    cout << "\nEnter player 2 name : ";
    cin >> p2;
    _player1Name = p1;
    _player2Name = p2;
}

void Players::printPlayersNames()
{
    cout << "Alright " << _player1Name << " and " << _player2Name <<", the game has begun!\n\n";
}

当我运行它并输入两个名称时，_player1Name 和 _player2Name 变量不会改变。我已经尝试手动为它们设置一个字符串并且它们可以正常打印。谁能解释这里有什么问题？好像 getPlayerNames 函数不能更改私有变量？

Answer 1

这是因为你有两个不同的对象！

一个用于设置成员变量的对象（通过getPlayersNames 函数），另一个不相关的对象用于打印一组不同的变量。

您应该有一个对象，并在该对象上调用getPlayersNames 和printPlayersNames。喜欢

Players playersObject;
playersObject.getPlayersNames();
playersObject.printPlayersNames();

---

您创建的Players 对象的每个实例都有自己的一组成员变量，这些变量绑定到该单个对象，成员变量不会在对象之间共享（除非您将它们设为static）。