c++学生信息管理系统

学生信息管理系统可以用 C++ 编写，主要包括以下功能：

1. 添加学生信息
2. 删除学生信息
3. 修改学生信息
4. 查询学生信息
5. 显示所有学生信息
6. 退出系统

具体实现可以使用 C++ 中的数据结构，如数组、链表等。以下是一个简单的示例代码：

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

struct Student {
    string name;
    int age;
    string id;
};

const int MAX_STUDENT_NUM = 100;
Student students[MAX_STUDENT_NUM];
int studentCount = 0;

void addStudent() {
    if (studentCount >= MAX_STUDENT_NUM) {
        cout << "学生信息已满，无法添加！" << 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 << "请输入学生学号：";
    cin >> student.id;
    students[studentCount++] = student;
    cout << "添加成功！" << endl;
}

void deleteStudent() {
    if (studentCount <= 0) {
        cout << "学生信息为空，无法删除！" << endl;
        return;
    }
    string id;
    cout << "请输入要删除的学生学号：";
    cin >> id;
    int index = -1;
    for (int i = 0; i < studentCount; i++) {
        if (students[i].id == id) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        cout << "未找到该学生信息！" << endl;
    } else {
        for (int i = index; i < studentCount - 1; i++) {
            students[i] = students[i + 1];
        }
        studentCount--;
        cout << "删除成功！" << endl;
    }
}

void updateStudent() {
    if (studentCount <= 0) {
        cout << "学生信息为空，无法修改！" << endl;
        return;
    }
    string id;
    cout << "请输入要修改的学生学号：";
    cin >> id;
    int index = -1;
    for (int i = 0; i < studentCount; i++) {
        if (students[i].id == id) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        cout << "未找到该学生信息！" << endl;
    } else {
        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 << "请输入学生学号：";
        cin >> student.id;
        students[index] = student;
        cout << "修改成功！" << endl;
    }
}

void queryStudent() {
    if (studentCount <= 0) {
        cout << "学生信息为空！" << endl;
    } else {
        string id;
        cout << "请输入要查询的学生学号：";
        cin >> id;
        int index = -1;
        for (int i = 0; i < studentCount; i++) {
            if (students[i].id == id) {
                index = i;
                break;
            }
        }
        if (index == -1) {
            cout << "未找到该学生信息！" << endl;
        } else {
            cout << "姓名：" << students[index].name << endl;
            cout << "年龄：" << students[index].age << endl;
            cout << "学号：" << students[index].id << endl;
        }
    }
}

void showAllStudents() {
    if (studentCount <= 0) {
        cout << "学生信息为空！" << endl;
    } else {
        for (int i = 0; i < studentCount; i++) {
            cout << "姓名：" << students[i].name << endl;
            cout << "年龄：" << students[i].age << endl;
            cout << "学号：" << students[i].id << endl << endl;
        }
    }
}

int main() {
    int choice;
    while (true) {
        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. 显示所有学生信息" << endl;
        cout << "6. 退出系统" << endl;
        cout << "请选择功能：";
        cin >> choice;
        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                deleteStudent();
                break;
            case 3:
                updateStudent();
                break;
            case 4:
                queryStudent();
                break;
            case 5:
                showAllStudents();
                break;
            case 6:
                cout << "退出系统！" << endl;
                return 0;
            default:
                cout << "无效的选择！" << endl;
                break;
        }
    }
}

以上代码实现了一个简单的学生信息管理系统，可以通过菜单进行各种操作，包括添加、删除、修改、查询和显示学生信息。