能用c++写一篇电影评分系统的代码吗？

当然可以，以下是一个简单的电影评分系统的C++代码：

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

using namespace std;

class Movie {
public:
    string title;
    int year;
    double rating;

    Movie(string title, int year, double rating) {
        this->title = title;
        this->year = year;
        this->rating = rating;
    }

    void print() {
        cout << title << " (" << year << ") - " << rating << "/10" << endl;
    }
};

class MovieDatabase {
public:
    vector<Movie> movies;

    MovieDatabase() {}

    void addMovie(Movie movie) {
        movies.push_back(movie);
    }

    void printAllMovies() {
        for (int i = 0; i < movies.size(); i++) {
            movies[i].print();
        }
    }

    vector<Movie> searchByTitle(string title) {
        vector<Movie> results;

        for (int i = 0; i < movies.size(); i++) {
            if (movies[i].title.find(title) != string::npos) {
                results.push_back(movies[i]);
            }
        }

        return results;
    }

    vector<Movie> searchByYear(int year) {
        vector<Movie> results;

        for (int i = 0; i < movies.size(); i++) {
            if (movies[i].year == year) {
                results.push_back(movies[i]);
            }
        }

        return results;
    }

    vector<Movie> searchByRating(double rating) {
        vector<Movie> results;

        for (int i = 0; i < movies.size(); i++) {
            if (movies[i].rating >= rating) {
                results.push_back(movies[i]);
            }
        }

        return results;
    }

    Movie getTopRated() {
        if (movies.empty()) {
            return Movie("", 0, 0);
        }

        Movie topRated = movies[0];

        for (int i = 1; i < movies.size(); i++) {
            if (movies[i].rating > topRated.rating) {
                topRated = movies[i];
            }
        }

        return topRated;
    }
};

int main() {
    MovieDatabase db;

    db.addMovie(Movie("The Godfather", 1972, 9.2));
    db.addMovie(Movie("The Shawshank Redemption", 1994, 9.3));
    db.addMovie(Movie("The Dark Knight", 2008, 9.0));
    db.addMovie(Movie("Pulp Fiction", 1994, 8.9));
    db.addMovie(Movie("Forrest Gump", 1994, 8.8));

    cout << "All movies:" << endl;
    db.printAllMovies();

    cout << endl << "Search results for 'The':" << endl;
    vector<Movie> results1 = db.searchByTitle("The");
    for (int i = 0; i < results1.size(); i++) {
        results1[i].print();
    }

    cout << endl << "Search results for 1994:" << endl;
    vector<Movie> results2 = db.searchByYear(1994);
    for (int i = 0; i < results2.size(); i++) {
        results2[i].print();
    }

    cout << endl << "Search results for rating >= 9.0:" << endl;
    vector<Movie> results3 = db.searchByRating(9.0);
    for (int i = 0; i < results3.size(); i++) {
        results3[i].print();
    }

    cout << endl << "Top rated movie:" << endl;
    Movie topRated = db.getTopRated();
    topRated.print();

    return 0;
}

这个程序定义了两个类：Movie 和 MovieDatabase。Movie类表示一个电影，包括标题、年份和评分。MovieDatabase类表示一个电影数据库，包括一个电影列表和一些操作，如添加电影、搜索电影、打印电影列表等等。

在主函数中，我们首先创建了一个MovieDatabase对象，并添加了一些电影。然后我们进行了一些搜索和显示操作，如搜索标题包含“the”的电影，搜索1994年的电影，搜索评分大于等于9.0的电影，以及显示评分最高的电影。

希望这个简单的例子能对你有所帮助！