c++类的作业实例(单链表)

这两周的c++课都没怎么听，也许是对自己太自信了，第一次的类的作业竟然不会做(丢人)，翻看了书本，加上论坛大佬的代码才大概弄明白；然而这次的上机作业，要求再用类写个链表系统，做的时候有发现问题了，虽然之前总结过链表，但是是用结构体写的，貌似不支持string(基于类的链表支持string)，这次又浏览了论坛上大佬的帖子，总结了一波，做出了以下单链表系统(阉割版)

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

typedef struct student {
    string name, ID, publisher, author;
    student* next;
} student, * stu;

class list {
public:
    ~list();//析构函数
    list(string, string, string, string);//构造函数
    void search(string name);
    void insert(string, string, string, string);
    void del(string);
    void print();
    void edit(string);
    struct student* head;
};

list::~list()
{
    cout << "release successfully" << endl;
    system("pause");
}
//析构函数不要出现在主函数里，不然会报错

list::list(string a, string b, string c, string d)
{
    head = new student;
    head->next = NULL;
    student* s = NULL;
    s = new student;
    s->name = a;
    s->ID = b;
    s->author = c;
    s->publisher = d;
    s->next = head->next;
    head->next = s;
}
//初始化链表

void list::search(string name)
{
    student* p = head->next;
    while (p != NULL) {
        if (p->name == name) {
            //return p;
            cout << "name: " << p->name << endl;
            cout << "ID: " << p->ID << endl;
            cout << "author: " << p->author << endl;
            cout << "publisher: " << p->publisher << endl;
            break;
        }
        p = p->next;
    }
    system("pause");
    //return NULL;
}
//查找链表中的成员

void list::insert(string a, string b, string c, string d)
{
    student* p = head, * s = NULL;
    s = new student;
    s->name = a;
    s->ID = b;
    s->author = c;
    s->publisher = d;
    s->next = p->next;
    head->next = s;
}
//往链表添加新成员

void list::del(string name)
{
    student* p = head->next, * s = head, * q = NULL;
    q = new student;
    while (p != NULL && p->name != name) {
        p = p->next;
        s = s->next;
    }
    if (p->name == name) {
        s->next = p->next;
        q = p;
        delete q;
        cout << "delete successfully" << endl;
    }
}
//删除链表的结点

void list::print()
{
    student* p = head->next;
    cout << "name\t" << "ID\t" << "author\t" << "publisher" << endl;
    while (p != NULL) {
        cout << p->name << '\t' << p->ID << '\t' << p->author << '\t' << p->publisher << endl;
        p = p->next;
    }
    cout << endl;
}
//打印链表

void list::edit(string name)
{
    student* p = head->next;
    while (p != NULL) {
        if (p->name == name) {
            break;
        }
        p = p->next;
    }
    while (1) {
        cout << "what data do you wanna edit(enter 'none' to exit): ";
        string temp;
        cin >> temp;
        cout << "enter the new data: ";
        if (temp == name) {
            cin >> p->name;
        }
        else if (temp == "ID") {
            cin >> p->ID;
        }
        else if (temp == "author") {
            cin >> p->author;
        }
        else if (temp == "publisher") {
            cin >> p->publisher;
        }
        else if (temp == "none") {
            break;
        }
        else {
            cout << "error, please check what you enter" << endl;
        }

    }
}
//编辑链表成员的数据

int main()
{
    list li("a", "b", "c", "d");
    while (1) {
        cout << "---------------------------\n";
        cout << "1.add the info             \n";
        cout << "2.search the info          \n";
        cout << "3.edit the info            \n";
        cout << "4.delete the info          \n";
        cout << "5.print the list           \n";
        cout << "0.exit                     \n";
        cout << "---------------------------\n";
        cout << "choose a mode: ";
        int mode;
        cin >> mode;
        if (mode == 1) {
            string a, b, c, d;
            cout << "enter the new data(name ID author publisher): ";
            cin >> a >> b >> c >> d;
            li.insert(a, b, c, d);
        }
        else if (mode == 2) {
            string temp;
            cout << "enter the book's name that you want to search: ";
            cin >> temp;
            li.search(temp);
        }
        else if (mode == 3) {
            string temp;
            cin >> temp;
            li.edit(temp);
        }
        else if (mode == 4) {
            string temp;
            cin >> temp;
            li.del(temp);
            system("pause");
        }
        else if (mode == 5) {
            li.print();
            system("pause");
        }
        else if (mode == 0) {
            cout << endl;
            system("pause");
            break;
        }
        else {
            cout << "error, please select the mode again\n";
            system("pause");
        }
        system("cls");
    }
}