void save_data(void)
{
    puts("保存数据");
    printf(" 请输入文件名");
    char filename[256];
    scanf("%s", filename);
    FILE *fp = fopen(filename, "r");
    if (fp == NULL)
    {
        perror(filename);
        return;
    }
    for (int i = 0; i < num_parts; i++)
    {
        fprintf(fp, "%d,%s,%d\n", stu[i].number, stu[i].name, stu[i].score);
    }
    fclose(fp);
    printf("保存%d 成功", num_parts);
}

//排序
void sort_data(void)
{
    printf("排序\n");
    for (int i = 0; i < num_parts; i++)
    {
        int change = 0;
        static struct students t;
        for (int j = 0; j < num_parts - i - 1; j++)
        {
            if (stu[j].number > stu[j + 1].number)
            {
                t = stu[j + 1];
                stu[j + 1] = stu[j];
                stu[j] = t;
                change = 1;
            }
        }
        if (!change)
            break;
    }
    for (int i = 0; i < num_parts; i++)
    {
        int change = 0;
        static struct students t;
        for (int j = 0; j < num_parts - i - 1; j++)
        {
            if (stu[j].score > stu[j + 1].score)
            {
                t = stu[j + 1];
                stu[j + 1] = stu[j];
                stu[j] = t;
                change = 1;
            }
        }
        if (!change)
            break;
    }
    printf("排序已完成");
}

void make_chart(void)
{
    printf("NUMBER  |  NAME                score\n");
    for (int i = 0; i < num_parts; i++)
    {
        printf("%d  |  %s ", stu[i].number, stu[i].name);
        for (int j = 0; j < stu[i].score; j++)
        {
            printf("*");
        }
        printf("\n");
    }
    printf("图表\n");
}

int confirm(const char *msg)
{
    char c = 'n';                // 默认选择是 no
    printf("%s(Y/N): ", msg);    // 提示输入 yes/no 进行确认
    scanf(" %c%*[^\n]", &c);     // 读取第一个字符，忽略剩余字符
    return c == 'y' || c == 'Y'; // 返回确认结果
}