用c++写一个学生管理系统

好的，下面是一个简单的学生管理系统的 C++ 代码示例：

#include <iostream>
#include <string>

using namespace std;

const int MAX_STUDENTS = 100; // 最大学生数

// 学生结构体
struct Student {
    string name;
    int age;
    char gender;
    float score;
};

// 学生管理系统类
class StudentManagementSystem {
private:
    Student students[MAX_STUDENTS]; // 学生数组
    int count; // 当前学生数
public:
    StudentManagementSystem() {
        count = 0;
    }

    // 添加学生
    void addStudent() {
        if (count >= MAX_STUDENTS) {
            cout << "已达到最大学生数！" << endl;
            return;
        }
        Student student;
        cout << "请输入学生姓名：";
        cin >> student.name;
        cout << "请输入学生年龄：";
        cin >> student.age;
        cout << "请输入学生性别（M/F）：";
        cin >> student.gender;
        cout << "请输入学生分数：";
        cin >> student.score;
        students[count] = student;
        count++;
        cout << "添加成功！" << endl;
    }

    // 删除学生
    void deleteStudent() {
        if (count <= 0) {
            cout << "当前没有学生！" << endl;
            return;
        }
        int index;
        cout << "请输入要删除的学生编号（从1开始）：";
        cin >> index;
        if (index < 1 || index > count) {
            cout << "请输入正确的学生编号！" << endl;
            return;
        }
        for (int i = index - 1; i < count - 1; i++) {
            students[i] = students[i + 1];
        }
        count--;
        cout << "删除成功！" << endl;
    }

    // 修改学生
    void modifyStudent() {
        if (count <= 0) {
            cout << "当前没有学生！" << endl;
            return;
        }
        int index;
        cout << "请输入要修改的学生编号（从1开始）：";
        cin >> index;
        if (index < 1 || index > count) {
            cout << "请输入正确的学生编号！" << endl;
            return;
        }
        Student student = students[index - 1];
        cout << "请输入学生姓名（原姓名：" << student.name << "）：";
        cin >> student.name;
        cout << "请输入学生年龄（原年龄：" << student.age << "）：";
        cin >> student.age;
        cout << "请输入学生性别（M/F，原性别：" << student.gender << "）：";
        cin >> student.gender;
        cout << "请输入学生分数（原分数：" << student.score << "）：";
        cin >> student.score;
        students[index - 1] = student;
        cout << "修改成功！" << endl;
    }

    // 查询学生
    void queryStudent() {
        if (count <= 0) {
            cout << "当前没有学生！" << endl;
            return;
        }
        int index;
        cout << "请输入要查询的学生编号（从1开始）：";
        cin >> index;
        if (index < 1 || index > count) {
            cout << "请输入正确的学生编号！" << endl;
            return;
        }
        Student student = students[index - 1];
        cout << "姓名：" << student.name << endl;
        cout << "年龄：" << student.age << endl;
        cout << "性别：" << student.gender << endl;
        cout << "分数：" << student.score << endl;
    }

    // 显示所有学生
    void showAllStudents() {
        if (count <= 0) {
            cout << "当前没有学生！" << endl;
            return;
        }
        for (int i = 0; i < count; i++) {
            cout << "学生编号：" << i + 1 << endl;
            cout << "姓名：" << students[i].name << endl;
            cout << "年龄：" << students[i].age << endl;
            cout << "性别：" << students[i].gender << endl;
            cout << "分数：" << students[i].score << endl;
        }
    }

    // 显示菜单
    void showMenu() {
        cout << "欢迎使用学生管理系统！" << endl;
        cout << "1. 添加学生" << endl;
        cout << "2. 删除学生" << endl;
        cout << "3. 修改学生" << endl;
        cout << "4. 查询学生" << endl;
        cout << "5. 显示所有学生" << endl;
        cout << "0. 退出程序" << endl;
        cout << "请输入操作编号：";
    }

    // 运行程序
    void run() {
        int choice;
        do {
            showMenu();
            cin >> choice;
            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    deleteStudent();
                    break;
                case 3:
                    modifyStudent();
                    break;
                case 4:
                    queryStudent();
                    break;
                case 5:
                    showAllStudents();
                    break;
                case 0:
                    cout << "谢谢使用，再见！" << endl;
                    break;
                default:
                    cout << "请输入正确的操作编号！" << endl;
                    break;
            }
        } while (choice != 0);
    }
};

int main() {
    StudentManagementSystem sms;
    sms.run();
    return 0;
}

这个学生管理系统包括添加、删除、修改、查询和显示所有学生等基本功能。可以根据需要进行修改和扩展。