帮我用c语言的链表来写个歌曲管理系统,并保存到文件里,还可以对文件里的歌曲信息进行增删查改

好的，以下是一个简单的歌曲管理系统的代码示例，使用了链表来存储歌曲信息，并且可以将歌曲信息保存到文件中。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct Song {
    char title[50];
    char artist[50];
    char album[50];
    int year;
    struct Song *next;
} Song;

Song *head = NULL;

void insertSong(char *title, char *artist, char *album, int year) {
    Song *newSong = (Song*) malloc(sizeof(Song));
    strcpy(newSong->title, title);
    strcpy(newSong->artist, artist);
    strcpy(newSong->album, album);
    newSong->year = year;
    newSong->next = NULL;

    if (head == NULL) {
        head = newSong;
    } else {
        Song *current = head;
        while (current->next != NULL) {
            current = current->next;
        }
        current->next = newSong;
    }
}

void displaySongs() {
    if (head == NULL) {
        printf("No songs\n");
    } else {
        Song *current = head;
        while (current != NULL) {
            printf("%s - %s (%s, %d)\n", current->title, current->artist, current->album, current->year);
            current = current->next;
        }
    }
}

void saveToFile() {
    FILE *fp = fopen("songs.txt", "w");
    if (fp == NULL) {
        printf("Error opening file\n");
    } else {
        Song *current = head;
        while (current != NULL) {
            fprintf(fp, "%s,%s,%s,%d\n", current->title, current->artist, current->album, current->year);
            current = current->next;
        }
        fclose(fp);
        printf("Saved to file\n");
    }
}

void loadFromFile() {
    FILE *fp = fopen("songs.txt", "r");
    if (fp == NULL) {
        printf("Error opening file\n");
    } else {
        char line[200];
        while (fgets(line, sizeof(line), fp)) {
            char *title = strtok(line, ",");
            char *artist = strtok(NULL, ",");
            char *album = strtok(NULL, ",");
            char *yearStr = strtok(NULL, ",");
            int year = atoi(yearStr);
            insertSong(title, artist, album, year);
        }
        fclose(fp);
        printf("Loaded from file\n");
    }
}

void deleteSong(char *title) {
    if (head == NULL) {
        printf("No songs\n");
    } else {
        Song *current = head;
        Song *previous = NULL;
        while (current != NULL) {
            if (strcmp(current->title, title) == 0) {
                if (previous == NULL) {
                    head = current->next;
                } else {
                    previous->next = current->next;
                }
                free(current);
                printf("Deleted song: %s\n", title);
                return;
            }
            previous = current;
            current = current->next;
        }
        printf("Song not found: %s\n", title);
    }
}

void editSong(char *title) {
    if (head == NULL) {
        printf("No songs\n");
    } else {
        Song *current = head;
        while (current != NULL) {
            if (strcmp(current->title, title) == 0) {
                printf("Enter new title: ");
                scanf("%s", current->title);
                printf("Enter new artist: ");
                scanf("%s", current->artist);
                printf("Enter new album: ");
                scanf("%s", current->album);
                printf("Enter new year: ");
                scanf("%d", &current->year);
                printf("Song updated\n");
                return;
            }
            current = current->next;
        }
        printf("Song not found: %s\n", title);
    }
}

int main() {
    loadFromFile();
    int choice;
    char title[50];
    char artist[50];
    char album[50];
    int year;
    do {
        printf("1. Add song\n");
        printf("2. Display songs\n");
        printf("3. Save to file\n");
        printf("4. Delete song\n");
        printf("5. Edit song\n");
        printf("6. Quit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                printf("Enter title: ");
                scanf("%s", title);
                printf("Enter artist: ");
                scanf("%s", artist);
                printf("Enter album: ");
                scanf("%s", album);
                printf("Enter year: ");
                scanf("%d", &year);
                insertSong(title, artist, album, year);
                break;
            case 2:
                displaySongs();
                break;
            case 3:
                saveToFile();
                break;
            case 4:
                printf("Enter title of song to delete: ");
                scanf("%s", title);
                deleteSong(title);
                break;
            case 5:
                printf("Enter title of song to edit: ");
                scanf("%s", title);
                editSong(title);
                break;
            case 6:
                break;
            default:
                printf("Invalid choice\n");
                break;
        }
    } while (choice != 6);

    return 0;
}

此代码使用了以下操作：

- `insertSong`：在链表中插入新的歌曲信息。
- `displaySongs`：显示链表中所有的歌曲信息。
- `saveToFile`：将链表中的歌曲信息保存到文件中。
- `loadFromFile`：从文件中加载歌曲信息，并将其插入链表中。
- `deleteSong`：删除链表中指定的歌曲信息。
- `editSong`：编辑链表中指定的歌曲信息。

你可以根据自己的需求修改这些操作。