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继承可以让子类拥有父类的所有成员(变量 \ 函数),提高代码的复用性
// 父类 class Person { protected: int m_age; public: void run() { cout << "Person::run()" << endl; } }; // 子类 class Student : public Person { int m_score; public: void study() { m_age = 666; cout << "Student::study(" << m_age << ")" << endl; } }; // 子类 class Worker : Person{ int m_salary; public: void work() { cout << "Worker::work()" << endl; } }; int main() { Student student; student.run(); student.study(); getchar(); return 0; }
关系描述:
Student是子类(subclass,派生类)
Person是父类(superclass,超类)
C++中没有像Java、OC的基类(类的老祖宗,其他所有的类最终都会继承自它。)
父类的成员变量在前,子类的成员变量在后:
struct Person { int m_age; }; struct Student : Person { int m_score; }; struct GoodStudent : Student { int m_money; }; int main() { GoodStudent lubenwei; // 1 lubenwei.m_age = 6; // 2 lubenwei.m_score = 66; // 3 lubenwei.m_money = 666; getchar(); return 0; }
成员访问权限、继承方式有3种
class Person { //公有 public: int m_id; // 保护 protected: // 私有 int m_age; private: int m_height; }; // 继承方式 class Student : public Person { int
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