学生成绩管理系统链表c++

以下是一个基于链表的C++学生成绩管理系统的示例代码，它可以实现添加、删除、修改和查询学生信息的功能：

#include <iostream>
#include <string>
#include <fstream>
#include <conio.h>
using namespace std;

class student {
public:
    int num1;
    long long num2;
    string name;
    double score1;
    double score2;
    double score3;
    double score4;
    double score5;
};

class list {
public:
    student stu;
    list *next;
};

list *head = new list;

void add() {
    list *p = head;
    while (p->next != NULL) {
        p = p->next;
    }
    list *newnode = new list;
    cout << "请输入学号：" << endl;
    cin >> newnode->stu.num1;
    cout << "请输入身份证号：" << endl;    cin >> newnode->stu.num2;
    cout << "请输入姓名：" << endl;
    cin >> newnode->stu.name;
    cout << "请输入语文成绩：" << endl;
    cin >> newnode->stu.score1;
    cout << "请输入数学成绩：" << endl;
    cin >> newnode->stu.score2;
    cout << "请输入英语成绩：" << endl;
    cin >> newnode->stu.score3;
    cout << "请输入物理成绩：" << endl;
    cin >> newnode->stu.score4;
    cout << "请输入化学成绩：" << endl;
    cin >> newnode->stu.score5;
    newnode->next = NULL;
    p->next = newnode;
    cout << "添加成功！" << endl;
}

void del() {
    int num;
    cout << "请输入要删除的学生学号：" << endl;
    cin >> num;
    list *p = head->next;
    list *pre = head;
    while (p != NULL) {
        if (p->stu.num1 == num) {
            pre->next = p->next;
            delete p;
            cout << "删除成功！" << endl;
            return;
        }
        pre = p;
        p = p->next;
    }
    cout << "未找到该学生！" << endl;
}

void modify() {
    int num;
    cout << "请输入要修改的学生学号：" << endl;
    cin >> num;
    list *p = head->next;
    while (p != NULL) {
        if (p->stu.num1 == num) {
            cout << "请输入新的身份证号：" << endl;
            cin >> p->stu.num2;
            cout << "请输入新的姓名：" << endl;
            cin >> p->stu.name;
            cout << "请输入新的语文成绩：" << endl;
            cin >> p->stu.score1;
            cout << "请输入新的数学成绩：" << endl;
            cin >> p->stu.score2;
            cout << "请输入新的英语成绩：" << endl;
            cin >> p->stu.score3;
            cout << "请输入新的物理成绩：" << endl;
            cin >> p->stu.score4;
            cout << "请输入新的化学成绩：" << endl;
            cin >> p->stu.score5;
            cout << "修改成功！" << endl;
            return;
        }
        p = p->next;
    }
    cout << "未找到该学生！" << endl;
}

void query() {
    int num;
    cout << "请输入要查询的学生学号：" << endl;
    cin >> num;
    list *p = head->next;
    while (p != NULL) {
        if (p->stu.num1 == num) {
            cout << "学号：" << p->stu.num1 << endl;
            cout << "身份证号：" << p->stu.num2 << endl;
            cout << "姓名：" << p->stu.name << endl;
            cout << "语文成绩：" << p->stu.score1 << endl;
            cout << "数学成绩：" << p->stu.score2 << endl;
            cout << "英语成绩：" << p->stu.score3 << endl;
            cout << "物理成绩：" << p->stu.score4 << endl;
            cout << "化学成绩：" << p->stu.score5 << endl;
            return;
        }
        p = p->next;
    }
    cout << "未找到该学生！" << endl;
}

int main() {
    head->next = NULL;
    int choice;
    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1.添加学生信息" << endl;
        cout << "2.删除学生信息" << endl;
        cout << "3.修改学生信息" << endl;
        cout << "4.查询学生信息" << endl;
        cout << "5.退出程序" << endl;
        cin >> choice;
        switch (choice) {
        case 1:
            add();
            break;
        case 2:
            del();
            break;
        case 3:
            modify();
            break;
        case 4:
            query();
            break;
        case 5:
            return 0;
        default:
            cout << "输入有误，请重新输入！" << endl;
            break;
        }
    }
    return 0;
}