编译器错误 - 在此上下文中是私有的 - 第 31 行答案

【问题标题】：Compiler error - is private within this context - Line 31编译器错误 - 在此上下文中是私有的 - 第 31 行
【发布时间】：2022-08-04 19:08:52
【问题描述】：

#include<iostream>
#include<string>
using namespace std;

class Item{
    private:
        string type;
        string abbrv;
        string uID;
        int aircraft;
        double weight;
        string destination;
    public:
        void print(){
        cout << \"ULD: \" << type << endl;
        cout << \"Abbreviation: \" << abbrv << endl;
        cout << \"ULD-ID: \" << uID << endl;
        cout << \"Aircraft: \" << aircraft << endl;
        cout << \"Weight: \" << weight << \" Kilograms\" << endl;
        cout << \"Destination: \" << destination << endl;
   }

    friend void kilotopound(Item);
};
void kilotopound(Item I){
    cout << \"Weight in Pounds: \" << I.weight * 2.2 << \" LBS \" << endl;
}

int main(){
   Item I;
   I.type = \"Container\";
   I.uID = \"AYK68943IB\";
   I.abbrv = \"AYK\";
   I.aircraft = 737;
   I.weight = 1654;
   I.destination = \"PDX\";
   I.print();
   kilotopound(I);

   return 0;
}

从第 31 行开始，我收到错误 \'std::__cxxll::string Item::type\' is private in this context

我基本上是在尝试将此代码中的数据设为私有

class Item{
    public:
        string type;
        string abbrv;
        string uID;
        int aircraft;
        double weight;
        string destination;
    void print(){
        cout << \"ULD: \" << type << endl;
        cout << \"Abbreviation: \" << abbrv << endl;
        cout << \"ULD-ID: \" << uID << endl;
        cout << \"Aircraft: \" << aircraft << endl;
        cout << \"Weight: \" << weight << \" Kilograms\" << endl;
        cout << \"Destination: \" << destination << endl;
   }

    friend void kilotopound(Item);
};
void kilotopound(Item I){
    cout << \"Weight in Pounds: \" << I.weight * 2.2 << \" LBS \" << endl;
}

int main(){
   Item I;
   I.type = \"Container\";
   I.uID = \"AYK68943IB\";
   I.abbrv = \"AYK\";
   I.aircraft = 737;
   I.weight = 1654;
   I.destination = \"PDX\";
   I.print();
   kilotopound(I);

   return 0;
}

任何帮助将不胜感激，我只是迷失了如何解决错误。谢谢！

此外，如果有人也可以提供帮助，我还需要能够再次复制和输出复制的数据，以及私人数据。再次感谢！

为了省去大家数数的麻烦，请指出哪一行是第31行。我想是这一行：I.type = \"Container\";
private 的目的是使类外的任何东西（例如main）都可以访问成员。如果您还想在课堂外访问成员，为什么还要让成员成为private？
您的问题是 main() 无法访问您班级的私人成员。与其尝试直接分配给私有类成员，不如添加可以设置或获取底层私有数据的公共成员函数（称为 setter 和 getter）。并提供可用于在创建类的实例时初始化成员的构造函数。

标签： c++ class private

【解决方案1】：

#include<iostream>
#include<string>

using namespace std;

class Item{
    private:
        string type;
        string abbrv;
        string uID;
        int aircraft;
        double weight;
        string destination;
    public:
        Item(string t, string a, string u, int aC, double w, string d){
            type = t;
            abbrv = a;
            uID = u;
            aircraft = aC;
            weight = w;
            destination = d;
        }
        void print() {
          cout << "ULD: " << type << endl;
          cout << "Abbreviation: " << abbrv << endl;
          cout << "ULD-ID: " << uID << endl;
          cout << "Aircraft: " << aircraft << endl;
          cout << "Weight: " << weight << " Kilograms" << endl;
          cout << "Destination: " << destination << endl;
        }

    friend void kilotopound(Item);
};

void kilotopound(Item I){
    cout << "Weight in Pounds: " << I.weight * 2.2 << " LBS " << endl;
}

int main(){
   Item I ("Container", "AYK68943IB", "AYK", 737, 1654, "PDX");
   I.print();
   kilotopound(I);

   return 0;
}

【讨论】：

非常感谢！对此，我真的非常感激！