c++ - 如何将私有(private)类的值返回到主类

Question

好的，这是程序

#include<iostream>
#include<iomanip>

using namespace std;

class My_Date{
private:
    int year;
    int month;
    int day;
public:
    My_Date(){}
    ~My_Date(){}
    void setDate(int recieve_year,int recieve_month,int recieve_day)
    {
        year = recieve_year;
        month = recieve_month;
        day = recieve_day;
    }
    int getYear()
    {
        return year;
    }
    int getMonth()
    {
        return month;
    }
    int getday()
    {
        return day;
    }
};

class ROrder{
private:
    unsigned int order_ID;
    My_Date Order_Date;
    double amount;
    double tip;
    double totalamount();


public:
    void setorder_ID(unsigned int recieve_order_ID)
    {
        order_ID = recieve_order_ID;
    }
    void setamount(double recieve_amount)
    {
        amount = recieve_amount;
    }
    void settip(double recieve_tip)
    {
        tip = recieve_tip;
    }

    double getorder_ID()
    {
        return order_ID;
    }
    double getamount()
    {
        return amount;
    }
    double gettip()
    {
        return tip;
    }
    void setDate(int y, int m, int d)
    {
        Order_Date.setDate(y,m,d);
    }

};

int main()
{
    int ID,send_Year,send_Month,send_Day,send_amount;
    class ROrder Rice;
    cout << "Enter Order ID: ";
    cin >>  ID;
    cout << "Enter Date (YYYY/MM/DD): ";
    cin >> send_Year >> send_Month >> send_Day;
    Rice.setorder_ID(ID);
    Rice.setDate(send_Year,send_Month,send_Day);
    cout << "Your Order ID is: " << Rice.getorder_ID()<<endl;

    return 0;
}

从程序中我认为我已经能够访问 My_Date 类以将值放入年月日变量中现在我唯一不知道的是如何将值返回到主类，因为 my_date 类是 ROrder 类的私有(private)类。认为代码不完整我只需要有关 my_date 类的返回值的帮助

Answer 1

在 ROrder 类中，添加:

public:
  int getYear(){
     return Order_Date.getYear();
  }

在main函数中，添加:

cout<<Rice.getYear()<<endl;

不知道是否解决了你的问题。