devc++学生信息管理系统

Dev-C++是一个免费的C++ IDE，可以用于开发各种类型的C++应用程序，包括学生信息管理系统。下面是一个简单的学生信息管理系统的示例：

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;

// 定义学生结构体
struct Student {
    string name;
    int age;
    string gender;
    string id;
    double score;
};

// 定义学生信息管理类
class StudentManager {
public:
    // 添加学生信息
    void addStudent(Student student) {
        students.push_back(student);
    }

    // 根据学号删除学生信息
    void deleteStudent(string id) {
        for (vector<Student>::iterator it = students.begin(); it != students.end(); it++) {
            if (it->id == id) {
                students.erase(it);
                break;
            }
        }
    }

    // 修改学生信息
    void modifyStudent(string id, Student student) {
        for (vector<Student>::iterator it = students.begin(); it != students.end(); it++) {
            if (it->id == id) {
                *it = student;
                break;
            }
        }
    }

    // 根据学号查询学生信息
    Student queryStudent(string id) {
        for (vector<Student>::iterator it = students.begin(); it != students.end(); it++) {
            if (it->id == id) {
                return *it;
            }
        }
        Student student;
        return student;
    }

    // 显示所有学生信息
    void showAllStudents() {
        for (vector<Student>::iterator it = students.begin(); it != students.end(); it++) {
            cout << "姓名：" << it->name << "，年龄：" << it->age << "，性别：" << it->gender << "，学号：" << it->id << "，成绩：" << it->score << endl;
        }
    }

    // 保存学生信息到文件
    void saveToFile(string filename) {
        ofstream outfile(filename);
        for (vector<Student>::iterator it = students.begin(); it != students.end(); it++) {
            outfile << it->name << "," << it->age << "," << it->gender << "," << it->id << "," << it->score << endl;
        }
        outfile.close();
    }

    // 从文件中读取学生信息
    void loadFromFile(string filename) {
        ifstream infile(filename);
        string line;
        while (getline(infile, line)) {
            Student student;
            int pos = line.find(",");
            student.name = line.substr(0, pos);
            line = line.substr(pos + 1);
            pos = line.find(",");
            student.age = stoi(line.substr(0, pos));
            line = line.substr(pos + 1);
            pos = line.find(",");
            student.gender = line.substr(0, pos);
            line = line.substr(pos + 1);
            pos = line.find(",");
            student.id = line.substr(0, pos);
            line = line.substr(pos + 1);
            student.score = stod(line);
            students.push_back(student);
        }
        infile.close();
    }

private:
    vector<Student> students;
};

int main() {
    StudentManager manager;
    manager.loadFromFile("students.txt");

    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. 显示所有学生信息" << endl;
        cout << "6. 保存学生信息到文件" << endl;
        cout << "7. 退出程序" << endl;

        int choice;
        cin >> choice;

        if (choice == 1) {
            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：";
            cin >> student.gender;
            cout << "请输入学生学号：";
            cin >> student.id;
            cout << "请输入学生成绩：";
            cin >> student.score;
            manager.addStudent(student);
            cout << "添加成功！" << endl;
        } else if (choice == 2) {
            string id;
            cout << "请输入要删除的学生学号：";
            cin >> id;
            manager.deleteStudent(id);
            cout << "删除成功！" << endl;
        } else if (choice == 3) {
            string id;
            cout << "请输入要修改的学生学号：";
            cin >> id;
            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：";
            cin >> student.gender;
            cout << "请输入学生成绩：";
            cin >> student.score;
            manager.modifyStudent(id, student);
            cout << "修改成功！" << endl;
        } else if (choice == 4) {
            string id;
            cout << "请输入要查询的学生学号：";
            cin >> id;
            Student student = manager.queryStudent(id);
            if (student.id == "") {
                cout << "未找到该学生！" << endl;
            } else {
                cout << "姓名：" << student.name << "，年龄：" << student.age << "，性别：" << student.gender << "，学号：" << student.id << "，成绩：" << student.score << endl;
            }
        } else if (choice == 5) {
            manager.showAllStudents();
        } else if (choice == 6) {
            manager.saveToFile("students.txt");
            cout << "保存成功！" << endl;
        } else if (choice == 7) {
            break;
        } else {
            cout << "输入有误，请重新输入！" << endl;
        }
    }

    return 0;
}