师生信息管理

给出下面的一个基类框架
class Person
{
protected:
int NO;//编号
public:
virtual void display()=0;//输出相关信息
}
以Person为基类，构建出Student、Teacher两个类。
生成上述类并编写主函数，要求主函数中有一个基类Person指针数组，数组元素不超过10个。
Person *pp[10];
主函数根据输入的信息，相应建立Student, Teacher类对象，对于Student给出期末5门课的成绩（为整数，缺考的科目填-1）， 对于Teacher则给出近3年，每年发表的论文数量。
输入格式：每个测试用例占一行，第一项为人员类型，1为Student,2为Teacher.接下来为编号（0-9999），接下来Student是5门课程成绩，Teacher是3年的论文数。最后一行为0，表示输入的结束。
要求输出编号，以及Student缺考的科目数和已考科目的平均分(保留1位小数，已考科目数为0时，不输出平均分)，Teacher的3年论文总数。
（PS:未使用 Person *pp[10]; ）

#include<iostream>
#include<string>
#include<iomanip>
using namespace std;

class Person
{
protected:
    int NO;//编号
public:
    virtual void display()=0;//输出相关信息
    virtual ~Person(){};
};

class Student:public Person
{
    int score[5];
public:
    Student(){};
    ~Student(){};
    friend istream& operator >> (istream &input,Student &S);　　//重载输入流
    void display();
};

istream& operator >> (istream &input,Student &S)
{
    input>>S.NO>>S.score[0]>>S.score[1]>>S.score[2]>>S.score[3]>>S.score[4];
    return input;
}

void Student::display()
{
    double average(0);
    int count(0);
    for(int i(0);i<5;i++)
    {
        if(score[i]==-1) count++;
        else average+=score[i];
    }
    average/=(5-count);
    if(count==5) cout<<NO<<" "<<count<<endl;
    else cout<<NO<<" "<<count<<" "<<fixed<<setprecision(1)<<average<<endl;
}

class Teacher:public Person
{
    int num[3];
public:
    Teacher(){};
    ~Teacher(){};
    friend istream& operator >> (istream &input,Teacher &T);
    void display();
};

istream& operator >> (istream &input,Teacher &T)
{
    input>>T.NO>>T.num[0]>>T.num[1]>>T.num[2];
    return input;
}

void Teacher::display()
{
    int number(0);
    for(int i(0);i<3;i++)
    {
        number+=num[i];
    }
    cout<<NO<<" "<<number<<endl;
}

int main()
{
    int flag;
    while(cin>>flag,flag)
    {
        switch(flag)
        {
        case 1:
            {
                Student *p=new Student;
                cin>>*p;
                p->display();
                delete p;
                break;
            }
        case 2:
            {
                Teacher *p=new Teacher;
                cin>>*p;
                p->display();
                delete p;
                break;
            }
        }
    }
    return 0;
}

(使用 Person *pp[10;])

#include<iostream>
#include<string>
#include<iomanip>
using namespace std;

class Person
{
protected:
    int NO;//编号
public:
    Person() {};
    Person(int N): NO(N) {};
    virtual void display() = 0; //输出相关信息
    virtual ~Person() {};
};

class Student: public Person
{
    int score[5];
public:
    Student() {};
    Student(int N, int S1, int S2, int S3, int S4, int S5): Person(N)
    {
        score[0] = S1, score[1] = S2, score[2] = S3, score[3] = S4, score[4] = S5;
    };
    ~Student() {};
    //friend istream& operator >> (istream &input,Student &S);
    void display();
};
/*
istream& operator >> (istream &input,Student &S)
{
    input>>S.NO>>S.score[0]>>S.score[1]>>S.score[2]>>S.score[3]>>S.score[4];
    return input;
}
*/
void Student::display()
{
    double average(0);
    int count(0);

    for(int i(0); i < 5; i++)
    {
        if(score[i] == -1) count++;
        else average += score[i];
    }

    average /= (5 - count);

    if(count == 5) cout << NO << " " << count << endl;
    else cout << NO << " " << count << " " << fixed << setprecision(1) << average << endl;
}

class Teacher: public Person
{
    int num[3];
public:
    Teacher() {};
    Teacher(int N, int N1, int N2, int N3): Person(N)
    {
        num[0] = N1, num[1] = N2, num[2] = N3;
    };
    ~Teacher() {};
    //friend istream& operator >> (istream &input,Teacher &T);
    void display();
};
/*
istream& operator >> (istream &input,Teacher &T)
{
    input>>T.NO>>T.num[0]>>T.num[1]>>T.num[2];
    return input;
}
*/
void Teacher::display()
{
    int number(0);

    for(int i(0); i < 3; i++)
    {
        number += num[i];
    }

    cout << NO << " " << number << endl;
}

int main()
{
    int flag, count(0);
    Person *pp[10];

    while(cin >> flag, flag)
    {
        switch(flag)
        {
            case 1:
                {
                    int N, S1, S2, S3, S4, S5;
                    cin >> N >> S1 >> S2 >> S3 >> S4 >> S5;
                    pp[count++] = new Student(N, S1, S2, S3, S4, S5);
                    pp[count - 1]->display();
                    break;
                }

            case 2:
                {
                    int N, N1, N2, N3;
                    cin >> N >> N1 >> N2 >> N3;
                    pp[count++] = new Teacher(N, N1, N2, N3);
                    pp[count - 1]->display();
                    break;
                }
        }
    }

    return 0;
}