2023 5 10

#include <iostream>
#include<iomanip>
using namespace std;
class Point {
protected:
    float x, y;
public:
    Point(float a, float b) {
        cout <<"Point constructor called" << endl;
        x = a;
        y = b;
    }
    ~Point() {
        cout << "Point destructor called" << endl;
    }
};
class Circle :public Point {
private:
    float r;
public:
    Circle(float a, float b, float c) :Point(a, b) {
        cout << "Circle constructor called" << endl;
        r = c;
    }
    ~Circle() {
        cout << "Circle destructor called" << endl;
    }
    float getCircumference() {
        return 3.14 * r * 2;
    }
};
int main()
{
    float x, y, r;
    cin >> x >> y >> r;
    Circle c(x, y, r);
    cout << fixed << setprecision(2) << c.getCircumference() << endl;
    return 0;
}

#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class Person{
    protected:
    string name;
     int age;
    public:
     Person(){}      
     Person (string p_name, int p_age){
         name=p_name;
         age=p_age;
     }
     void display () {cout<<name<<":"<<age<<endl;}
};
class student:public Person{
    private:
    int ID;
float cpp_score;
float cpp_count;
float cpp_grade;
    public:
    student(){}
    student(string str,int a,int b,float c,float d):Person(str,b){
        ID=a;
        cpp_score=c;
        cpp_count=d;
        cpp_grade=cpp_score * 0.9 + cpp_count * 2;
    }
    void print(){
        cout<<ID<<" "<<name<<" "<<fixed<<setprecision(1)<<cpp_grade<<endl;
    }
};
int main(){
    while(1){
        string str;
        int a;//年龄
        int b;//ID
        float c;//cpp_score
        float d;//cpp_count
cin>>str>>a>>b>>c>>d;
        if(str=="0"){
            break;
        }
    student s1(str,a,b,c,d);
        s1.print();
        
    }
    return 0;
}