继承的写法
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//父类 基类class parent{};//子类 派生类//公有继承class soon1:public parent{ public: protected:};//保护继承class son2:protected parent{ public: protected:};//私有继承class son3:private parent{ public: protected:};//继承和派生//继承：子类中没有产生新的属性和行为//派生：派生类中有新的属性和行为产生class 子类名：继承方式 父类名{};//继承方式 就是权限限定词 |
继承实质与权限问题
- 继承的实质：父类的数据和成员子类中有一份
- 权限问题：继承方式只会增强父类属性在子类中的权限显示
| public | protected | private | |
|---|---|---|---|
| public继承 | public | protected | 不可直接访问 |
| protected继承 | protected | protected | 不可直接访问 |
| private继承 | private | protected | 不可直接访问 |
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#include<iostream>#include<string>using namespace std;class parent{public: void print() { cout << name << "\t" << money << endl; } string& getWide() { return wide; }protected: string name; int money;private: string wife;};//子类class son :public parent{public: void printSon() { print(); cout << name<<"\t"<<money<< endl; //cout << wife << endl;父类中的私有属性不能直接访问 cout << getWide() <<endl;//间接通过父类的函数访问 }protected:};class A{public: int a1;protected: int a2;private: int a3;};class B :public A{public: //int a1; protected: //int a2;private: //int a3;不能直接访问};class C :protected A{public:protected: //int a1; public 显示protected //int a2;private: //int a3;不能直接访问};class D :private A{public: void print() { cout << a1 << endl;; cout << a2<< endl; }protected:private: //int a1; public 显示protected //int a2; //int a3;//父类的私有属性不能直接访问};//私有继承会导致当前父类 无法在孙子类有任何作用class F :public D{public:};int main(){ son boy; boy.printSon(); B b; b.a1 = 123; C c; //c.a1 = 12; return 0;} |
总结
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原文链接：https://blog.csdn.net/qq_24409999/article/details/123388122
