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- class 派生类名:[继承方式] 基类名{
- 派生类新增加的成员
- };
继承方式限定了基类成员在派生类中的访问权限,包括 public(公有的)、private(私有的)和 protected(受保护的)。此项是可选的,如果不写,默认为 private 或 protected。
private 继承限制太多,实际开发中很少使用,一般使用 public。一个完整的例子:
- #include<iostream>
- using namespace std;
-
- //基类--Pelple
- class People{
- private:
- char *name;
- int age;
- public:
- void setName(char*);
- void setAge(int);
- void display();
- };
- void People::setName(char *name){ this->name = name; }
- void People::setAge(int age){ this->age = age; }
- void People::display(){ cout<<name<<"的年龄是 "<<age; }
-
- //派生类--Student
- class Student: public People{
- private:
- float score;
- public:
- Student(char*, int, float);
- void display1();
- };
- Student::Student(char *name, int age, float score){
- this->setName(name);
- this->setAge(age);
- this->score = score;
- }
- void Student::display1(){
- this->display();
- cout<<",成绩是 "<<score<<endl;
- }
-
- int main(){
- Student stu("小明", 15, 90.5);
- stu.display1();
-
- return 0;
- }
- #include<iostream>
- using namespace std;
-
- class People{
- protected:
- char *name;
- int age;
- public:
- void say();
- };
- void People::say(){
- cout<<"你好,欢迎来到C语言中文网!"<<endl;
- }
-
- class Student: public People{
- private:
- using People::say; //改变访问属性
- public:
- using People::name; //改变访问属性
- using People::age;
- float score;
- void learning();
- };
- void Student::learning(){
- cout<<"我是"<<name<<",今年"<<age<<"岁,我学习非常努力,这次考了"<<score<<"分!"<<endl;
- }
-
- int main(){
- Student stu;
- stu.name = "小明";
- stu.age = 16;
- stu.score = 99.5f;
- stu.say(); //compile error
- stu.learning();
-
- return 0;
- }
- class A{ //基类
- public:
- int i;
- protected:
- void f2( );
- int j;
- private:
- int k;
- };
-
- class B: public A{ //public继承
- public:
- void f3( );
- protected:
- void f4( );
- private:
- int m;
- };
-
- class C: protected B{ //protected方式
- public:
- void f5( );
- private:
- int n;
- };
i | f2 | j | k | f3 | f4 | m | f5 | n | |
基类A | 共有 | 保护 | 保护 | 私有 | |||||
共有派生类B | 共有 | 保护 | 保护 | 不可访问 | 共有 | 保护 | 私有 | ||
保护派生类C | 保护 | 保护 | 保护 | 不可访问 | 保护 | 保护 | 不可访问 | 共有 | 私有 |
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