class? Student{

    int age;

    char name[32];

    void say();

    void sleep();

};

class? Student{

private:? 声明下面两个成员为私有

????????int age;

????????char name[32];

public：

????????char sex；

public:? 声明下面一个成员为公有

????????void say();

protected:? 声明下面一个成员为保护

????????void sleep();

};

class Student{
private:
??? int age;
??? char name[32];
??? char sex;
public:
??? void say(){
??????? cout<<age<<name<<sex<<endl;? //类内使用
    }
    void setAge(int e){
???      age = e;
    }
    int getAge(){return age;}
protected:
??? void sleep(){
??? }
};
int main(){
??? //创建对象
??? Student jack;
??? jack.say();? //类外使用? --类的对象访问成员用点(.)
??? //创建指针
??? Student *rose = new Student();
??? rose->say(); //类外使用? --类的指针访问成员用→
??? delete? rose;
??? return 0;
}

class Data{
private:
??? int data;
??? int number;
??? char name[32];
public:
??? void show()
??? {
??????? cout<<this->data<<endl;
??? }
??? void print()?? //B.print()这时候函数里面的this就是&B
??? {
??????? cout<<this->data<<endl;
??? }
??? void setData(int data)
??? {
??????? this->data = data;
??? }
};
int main()
{
??? cout<<sizeof(Data)<<endl;

??? Data A;? //40
??? A.show();
??? Data B;? //40
??? B.print();
??? return 0;
}

class Data
{
public:
??? void setData(int data);
??? inline void showData(); //声明为内联函数
??? void show() //类内声明和实现， 默认就是内联函数
??? {
??????? cout<<data<<endl;
??? }
private:
??? int data;
};

//成员函数实现
void Data::setData(int data)
{
??? this->data = data;
}
void Data::showData()
{
??? cout<<this->data<<endl;
}
int main()
{

??? Data d;
??? d.setData(100);
??? d.show();
??? d.showData();
??? return 0;
}