如何用VS的C++语言写一个学生实验课选课系统

首先，你需要设计一个学生实验课选课系统的数据模型，例如：学生信息、实验课程信息、选课信息等。然后，你可以使用C++语言中的面向对象编程思想来实现这个系统。

以下是一个简单的实现步骤：

1. 定义学生类和实验课程类，包括属性和方法。
2. 定义选课类，包括学生和实验课程的信息，以及选课操作等方法。
3. 实现主函数，创建学生和实验课程对象，并进行选课操作。
4. 将数据存储到文件中，以便下次启动程序时可以读取上一次的选课信息。

以下是一个简单的代码示例：

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

using namespace std;

class Student {
public:
    Student(string name, string major, int id) {
        this->name = name;
        this->major = major;
        this->id = id;
    }

    string name;
    string major;
    int id;
};

class Course {
public:
    Course(string name, int id, int capacity) {
        this->name = name;
        this->id = id;
        this->capacity = capacity;
    }

    string name;
    int id;
    int capacity;
};

class Enrollment {
public:
    Enrollment(Student student, Course course) {
        this->student = student;
        this->course = course;
    }

    Student student;
    Course course;
};

void save(vector<Enrollment>& enrollments) {
    ofstream file("enrollments.txt");

    for (auto enrollment : enrollments) {
        file << enrollment.student.name << ",";
        file << enrollment.student.major << ",";
        file << enrollment.student.id << ",";
        file << enrollment.course.name << ",";
        file << enrollment.course.id << ",";
        file << enrollment.course.capacity << "\n";
    }

    file.close();
}

vector<Enrollment> load() {
    vector<Enrollment> enrollments;
    ifstream file("enrollments.txt");

    if (file.is_open()) {
        string line;

        while (getline(file, line)) {
            string name, major, courseName;
            int id, courseId, capacity;
            int index = 0;

            for (int i = 0; i < line.size(); i++) {
                if (line[i] == ',') {
                    string field = line.substr(index, i - index);
                    index = i + 1;

                    if (name.empty()) {
                        name = field;
                    } else if (major.empty()) {
                        major = field;
                    } else if (id == 0) {
                        id = stoi(field);
                    } else if (courseName.empty()) {
                        courseName = field;
                    } else if (courseId == 0) {
                        courseId = stoi(field);
                    } else if (capacity == 0) {
                        capacity = stoi(field);
                    }
                }
            }

            enrollments.push_back(Enrollment(Student(name, major, id), Course(courseName, courseId, capacity)));
        }

        file.close();
    }

    return enrollments;
}

int main() {
    vector<Enrollment> enrollments = load();

    Student alice("Alice", "Computer Science", 1001);
    Student bob("Bob", "Mathematics", 1002);
    Course calculus("Calculus", 2001, 30);
    Course programming("Programming", 2002, 20);

    enrollments.push_back(Enrollment(alice, calculus));
    enrollments.push_back(Enrollment(bob, programming));

    save(enrollments);

    return 0;
}

在上面的示例中，我们定义了学生、实验课程和选课类，并实现了数据存储和加载。在主函数中，我们创建了两个学生和两门实验课程，并进行选课操作。最后，我们将选课信息存储到文件中，并在下次启动程序时加载上一次的选课信息。