问题描述 建立一个供个人使用的音乐信息管理系统，用于存储、管理和快速查找歌曲信息；能够生成收藏夹和按歌名排序的播放列表。 2.1.2分析与设计提示 1.歌曲信息 音乐信息可能包括两方面的内容。 （1）音乐的基本信息，如名称、演唱者、创作者等 （2）根据个人查找偏好的查找信息，如类别、年份、喜爱程度、曲风等。 2.功能设计 作为一个乐库管理系统，最基本的功能如下。 （1）歌曲的增、删、改。通过这些操作更新乐库。 （2）歌曲查找。查找功能需考虑到用户的多种需求，如按演唱者查找、按歌名查找、按类别查找或多条件组合查找 （3）歌曲浏览。该功能可能是总歌单浏览，也可能是查找后的歌曲浏览。总歌单浏览可以显示歌曲的所有信息，也可以显示部分信息。 如果提供收藏夹功能，需考虑收藏夹的创建，在收藏夹中增、删、查歌 曲等功能。 除上述功能外，用户根据乐库管理的需求增设其他功能。例如，按查找次数形成热门歌单等。 3.存储设计 每一首歌曲有多个属性，查找时按关键字查找，关键字由用户的查找偏好决定。存储设计既要考虑歌曲信息管理的方便，也需考虑到查找的需要。用c++写这段代码

以下是用 C++ 实现音乐信息管理系统的代码示例：

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

struct Song {
    string name;
    string singer;
    string creator;
    string category;
    string year;
    string style;
    int likes;
    int play_count;
};

class MusicLibrary {
    vector<Song> songs;
    vector<Song> favorites;
public:
    void addSong(Song song) {
        songs.push_back(song);
    }

    void removeSong(int index) {
        songs.erase(songs.begin() + index);
    }

    void updateSong(int index, Song song) {
        songs[index] = song;
    }

    vector<Song> searchSong(string keyword) {
        vector<Song> result;
        for (Song song : songs) {
            if (song.name.find(keyword) != string::npos ||
                song.singer.find(keyword) != string::npos ||
                song.category.find(keyword) != string::npos ||
                song.year.find(keyword) != string::npos ||
                song.style.find(keyword) != string::npos) {
                result.push_back(song);
            }
        }
        return result;
    }

    vector<Song> sortBySongName() {
        vector<Song> result = songs;
        sort(result.begin(), result.end(), [](const Song& a, const Song& b) {
            return a.name < b.name;
        });
        return result;
    }

    void viewAllSongs(bool showAllInfo) {
        for (Song song : songs) {
            if (showAllInfo) {
                cout << "Name: " << song.name << endl;
                cout << "Singer: " << song.singer << endl;
                cout << "Creator: " << song.creator << endl;
                cout << "Category: " << song.category << endl;
                cout << "Year: " << song.year << endl;
                cout << "Style: " << song.style << endl;
                cout << "Likes: " << song.likes << endl;
                cout << "Play Count: " << song.play_count << endl;
            } else {
                cout << song.name << " - " << song.singer << endl;
            }
        }
    }

    void addSongToFavorites(int index) {
        favorites.push_back(songs[index]);
    }

    void removeSongFromFavorites(int index) {
        favorites.erase(favorites.begin() + index);
    }

    vector<Song> searchSongInFavorites(string keyword) {
        vector<Song> result;
        for (Song song : favorites) {
            if (song.name.find(keyword) != string::npos ||
                song.singer.find(keyword) != string::npos ||
                song.category.find(keyword) != string::npos ||
                song.year.find(keyword) != string::npos ||
                song.style.find(keyword) != string::npos) {
                result.push_back(song);
            }
        }
        return result;
    }

    vector<Song> sortByPlayCount() {
        vector<Song> result = songs;
        sort(result.begin(), result.end(), [](const Song& a, const Song& b) {
            return a.play_count > b.play_count;
        });
        return result;
    }
};

int main() {
    MusicLibrary library;

    // Add some songs to the library
    Song song1 = {"Song 1", "Singer 1", "Creator 1", "Category 1", "Year 1", "Style 1", 10, 100};
    Song song2 = {"Song 2", "Singer 2", "Creator 2", "Category 2", "Year 2", "Style 2", 20, 200};
    Song song3 = {"Song 3", "Singer 3", "Creator 3", "Category 3", "Year 3", "Style 3", 30, 300};
    library.addSong(song1);
    library.addSong(song2);
    library.addSong(song3);

    // Search for a song
    vector<Song> searchResult = library.searchSong("2");
    cout << "Search Result:" << endl;
    for (Song song : searchResult) {
        cout << song.name << " - " << song.singer << endl;
    }
    cout << endl;

    // Sort songs by name
    vector<Song> sortedBySongName = library.sortBySongName();
    cout << "Songs sorted by name:" << endl;
    for (Song song : sortedBySongName) {
        cout << song.name << " - " << song.singer << endl;
    }
    cout << endl;

    // View all songs
    cout << "All songs:" << endl;
    library.viewAllSongs(false);
    cout << endl;

    // Add a song to favorites
    library.addSongToFavorites(0);
    cout << "Favorites:" << endl;
    for (Song song : library.searchSongInFavorites("")) {
        cout << song.name << " - " << song.singer << endl;
    }
    cout << endl;

    // Remove a song from favorites
    library.removeSongFromFavorites(0);
    cout << "Favorites:" << endl;
    for (Song song : library.searchSongInFavorites("")) {
        cout << song.name << " - " << song.singer << endl;
    }
    cout << endl;

    // Sort songs by play count
    vector<Song> sortedByPlayCount = library.sortByPlayCount();
    cout << "Songs sorted by play count:" << endl;
    for (Song song : sortedByPlayCount) {
        cout << song.name << " - " << song.play_count << endl;
    }
    cout << endl;

    return 0;
}

在这个示例代码中，我们定义了一个Song结构体来表示每首歌曲的信息，以及一个MusicLibrary类来管理所有的歌曲和收藏夹。MusicLibrary类中实现了增、删、改、查、排序、浏览等功能，以及收藏夹的相关操作。我们在main函数中使用这个类来演示了这些功能的使用。

请注意，这只是一个示例代码，您可能需要根据自己的需求进行修改和扩展。