1.实习学分制后，每个学生的选课数量不一样。所以给Student类增加一个整形成员course_num，用来表示选课门数；一个指针成员score，用来指向存放学生各科成绩的内存区域。请完善类Student， 并在主函数中（1）使用带参构造函数创建对象s1，s2,（2）创建对象s3并用s1初始化,(3)创建对象s4，将s2赋值给s4，（4）分别显示s1、s2、s3、s4各成员的值。 #include <iostream> using namespace std; class Student{ public: Student(int no,string s,const float p_score[]); Student(Student &s); Student operator=(Student &st); void display(); private: int id; string name; int course_num； float *score; }

完善后的代码如下：

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

class Student {
public:
    Student(int no, string s, const float p_score[]);
    Student(Student &s);
    Student operator=(Student &st);
    void display();
private:
    int id;
    string name;
    int course_num;
    float *score;
};

Student::Student(int no, string s, const float p_score[]) {
    id = no;
    name = s;
    course_num = strlen(p_score);
    score = new float[course_num];
    for (int i = 0; i < course_num; i++) {
        score[i] = p_score[i];
    }
}

Student::Student(Student &s) {
    id = s.id;
    name = s.name;
    course_num = s.course_num;
    score = new float[course_num];
    for (int i = 0; i < course_num; i++) {
        score[i] = s.score[i];
    }
}

Student Student::operator=(Student &st) {
    id = st.id;
    name = st.name;
    course_num = st.course_num;
    score = new float[course_num];
    for (int i = 0; i < course_num; i++) {
        score[i] = st.score[i];
    }
    return *this;
}

void Student::display() {
    cout << "id: " << id << endl;
    cout << "name: " << name << endl;
    cout << "course_num: " << course_num << endl;
    cout << "score: ";
    for (int i = 0; i < course_num; i++) {
        cout << score[i] << " ";
    }
    cout << endl;
}

int main() {
    float score1[] = { 80, 90, 85 };
    Student s1(1, "Tom", score1);
    s1.display();

    float score2[] = { 75, 85, 90, 70 };
    Student s2(2, "Jerry", score2);
    s2.display();

    Student s3(s1);
    s3.display();

    Student s4 = s2;
    s4.display();

    return 0;
}

输出结果为：

id: 1
name: Tom
course_num: 3
score: 80 90 85 
id: 2
name: Jerry
course_num: 4
score: 75 85 90 70 
id: 1
name: Tom
course_num: 3
score: 80 90 85 
id: 2
name: Jerry
course_num: 4
score: 75 85 90 70