使用c++学生成绩管理系统

以下是使用C++实现学生成绩管理系统的示例代码：

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

// 定义学生类
class Student {
public:
    string id; // 学号
    string name; // 姓名
    int score1; // 大学英语一成绩
    int score2; // 大学英语二成绩
    int score3; // 大学英语三成绩

    // 构造函数
    Student(string id, string name, int score1, int score2, int score3) {
        this->id = id;
        this->name = name;
        this->score1 = score1;
        this->score2 = score2;
        this->score3 = score3;
    }

    // 显示学生信息
    void display() {
        cout << "学号：" << id << "，姓名：" << name << "，大学英语一成绩：" << score1 << "，大学英语二成绩：" << score2 << "，大学英语三成绩：" << score3 << endl;
    }
};

// 定义学生管理系统类
class StudentSystem {
private:
    vector<Student> students; // 学生列表

public:
    // 添加学生
    void addStudent() {
        string id, name;
        int score1, score2, score3;
        cout << "请输入学号：";
        cin >> id;
        cout << "请输入姓名：";
        cin >> name;
        cout << "请输入大学英语一成绩：";
        cin >> score1;
        cout << "请输入大学英语二成绩：";
        cin >> score2;
        cout << "请输入大学英语三成绩：";
        cin >> score3;
        Student student(id, name, score1, score2, score3);
        students.push_back(student);
        cout << "添加成功！" << endl;
    }

    // 显示所有学生信息
    void displayAllStudents() {
        for (int i = 0; i < students.size(); i++) {
            students[i].display();
        }
    }

    // 根据学号查找学生
    Student* findStudentById(string id) {
        for (int i = 0; i < students.size(); i++) {
            if (students[i].id == id) {
                return &students[i];
            }
        }
        return NULL;
    }

    // 修改学生信息
    void modifyStudent() {
        string id;
        cout << "请输入要修改的学生的学号：";
        cin >> id;
        Student* student = findStudentById(id);
        if (student == NULL) {
            cout << "未找到该学生！" << endl;
            return;
        }
        cout << "请输入新的姓名：";
        cin >> student->name;
        cout << "请输入新的大学英语一成绩：";
        cin >> student->score1;
        cout << "请输入新的大学英语二成绩：";
        cin >> student->score2;
        cout << "请输入新的大学英语三成绩：";
        cin >> student->score3;
        cout << "修改成功！" << endl;
    }

    // 删除学生
    void deleteStudent() {
        string id;
        cout << "请输入要删除的学生的学号：";
        cin >> id;
        for (vector<Student>::iterator it = students.begin(); it != students.end(); it++) {
            if (it->id == id) {
                students.erase(it);
                cout << "删除成功！" << endl;
                return;
            }
        }
        cout << "未找到该学生！" << endl;
    }

    // 按照总成绩排序并显示
    void sortByTotalScore() {
        vector<Student> temp = students;
        sort(temp.begin(), temp.end(), [](Student a, Student b) {
            return a.score1 + a.score2 + a.score3 > b.score1 + b.score2 + b.score3;
        });
        for (int i = 0; i < temp.size(); i++) {
            temp[i].display();
        }
    }
};

int main() {
    StudentSystem system;
    int choice;
    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1.添加学生" << endl;
        cout << "2.显示所有学生信息" << endl;
        cout << "3.修改学生信息" << endl;
        cout << "4.删除学生" << endl;
        cout << "5.按照总成绩排序并显示" << endl;
        cout << "6.退出" << endl;
        cin >> choice;
        switch (choice) {
        case 1:
            system.addStudent();
            break;
        case 2:
            system.displayAllStudents();
            break;
        case 3:
            system.modifyStudent();
            break;
        case 4:
            system.deleteStudent();
            break;
        case 5:
            system.sortByTotalScore();
            break;
        case 6:
            return 0;
        default:
            cout << "无效的操作！" << endl;
            break;
        }
    }
    return 0;
}