声明一个基类Student(学生)类

Question

1、声明一个基类Student(学生)类，声明一个派生出新类college_student (大学生)类，并继承Student(学生)类，要求：
(1) 在Student类中包括：num（学号），name（姓名），sex（性别）等成员数据，viod display（）;（输出学生学号，姓名，性别）函数成员，构造函数自己设计。
(2) 在派生出新类college_student (大学生)类中包括：Chinese（语文分），math（数学分），computer（计算机分）等成员数据，float total_score();（统计一个大学生的三科总分）。
(3) 建立一个对象数组，内放5位大学生的数据(学号、姓名、性别、语文分、数学分、计算机分)，设立一个函数max，用指向对象的指针作函数参数，在max函数中找出5个学生中总成绩最高者，并输出该学生的所有信息（学号、姓名、性别、语文分、数学分、计算机分，及总分）。
(4) 对5位大学生按总分进行排名，并输出排名后的结果。

Answer 1

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

class Student {
public:
    Student(int num, string name, bool is_male): num_(num), name_(name), sex_(is_male) {}
    virtual ~Student() {}
    
    virtual void display(void) {
        cout << "学号：" << num_ << " 姓名：" << name_ << " 性别：" << sex() << endl;
    }

    string sex()
    {
        return sex_ ? "男" : "女";
    }

    int num() { return num_; }

    string name() { return name_; }

private:
    int num_ = 0;//序号
    string name_;//姓名
    bool sex_;//性别， true 男 false 女
};

class college_student
    : public Student {
public:
    college_student(int num, string name, bool is_male, float chinese, float math, float computer)
        : Student(num, name, is_male)
        , chinese_(chinese)
        , math_(math)
        , computer_(computer) {}
    ~college_student() {}

    void display() {
        Student::display();
        cout << "chinese = " << chinese_ << " math = " << math_ << " computer = " << computer_ << " total = " << total_score() << endl;
    }
    float total_score() { return chinese_ + math_ + computer_; }

private:
    float chinese_ = 0.0;
    float math_ = 0.0;
    float computer_ = 0.0;
};

college_student students[] = {
    {1, "张三丰", true, 88.5, 90.0, 77.0},
    {2, "王晓红", false, 88, 91.0, 87.0},
    {3, "段誉", true, 68.5, 90.0, 76.0},
    {4, "王重阳", true, 83.5, 93.0, 97.0},
    {5, "林黛玉", false, 82.5, 92.0, 97.0},
};

void max(college_student* students, int count)
{
    float score = 0.0;
    college_student* pStu = students;
    for (int i=0;i<count; ++i)
    {        
        if (pStu->total_score() > students[i].total_score())
        {
            pStu = &students[i];
        }        
    }
    pStu->display();
}

void sort(college_student* students, int count) 
{
    college_student** tempArray = new college_student*[count];
    //copy
    for (int i=0; i<count; ++i)
    {
        tempArray[i] = &students[i];
    }
    //sort
    for (int i=0; i<count - 1; ++i)
    {
        for (int j= 0; j<count - 1 - i; ++j)
        {
            if (tempArray[j] < tempArray[j + 1])
            {
                college_student* temp = tempArray[j];
                tempArray[j] = tempArray[j + 1];
                tempArray[j + 1] = temp;
            }            
        }
    }
    //print
    for (int i = 0; i < count; ++i)
    {
        tempArray[i]->display();
    }

    delete[] tempArray;
}

int main() {
    //max
    max(students, sizeof(students) / sizeof(college_student));
    //sort
    sort(students, sizeof(students) / sizeof(college_student));

    //wait
    int i = 0;
    cin >> i;
    return 0;
}