8月29号

第二题

头文件

#ifndef __class__
#define __class__

#include
#include

using namespace std;

class stu
{
private:
    string name;
protected:
    int age;
public:
    double score=100;

    int init(string name,int age,float score);

};

#endif

主函数

#include"class.h"
int main()
{
    string n="江䟠鹅";
    int ag=80;
    double sc=98;

    stu s1;
    s1.init(n,ag,sc);
     while(1)
    {
    cout << "请输入姓名年龄还有分数" << endl;
    cin >> n >> ag >> sc;
    s1.init(n,ag,sc);
    }
    return  0;
}
 

成员函数

#include"class.h"

int stu::init(string name,int age,float score)
{
   this-> name=name;
    stu::age=age;
    this->score=score;
    cout << "name = " << name << endl;
    cout << "age = " << age << endl;
    cout << "score = " << score << endl;
    return 0;
}

第三题

#include 

#include 

using namespace std;

class Rect

{

private:

    int width;

    int heigth;

public:

    void init(int width,int heigth);

    void set_w_h();

    void show();

};

void Rect::init(int width,int heigth)

{

   this->width=width;

   this->heigth=heigth;

}

 void Rect::set_w_h()

 {

     int width,heigth;

     cout << "请输入宽度和高度" << endl;

     cin >> width >> heigth ;

     this->width=width;

      this->heigth=heigth;

     this->show();

 }

 void Rect::show()

 {

     cout << "面积为" << this->width * this ->heigth << endl;

 }

int main()

{

    Rect s1;

    int width,heigth;

     while(1)

    {

    cout << "请输入宽度和高度" << endl;

    cin >> width >> heigth ;

    int pan;

    cout << "请问是否需要修改1，修改 2，不修改" << endl;

    cin >> pan ;

    if(pan==1)

    {

        s1.set_w_h();

    }

    else

    {

        s1.init(width,heigth);

        s1.show();

    }

}

    return  0;

}