程序代码：

void fileread(struct student *head)    //定义读取文件函数
{
    FILE *fp;
    struct student *pC;
    if((fp=fopen("record.txt","r+"))==NULL)
    {
        printf("文件打开错误!");
        return 0;
    }
    pC = (struct student*)malloc(LEN);
    pC = head;
    fscanf(fp,"%d %d %s %d %d %d %d %d %d %d %d %d %d\n",&pC->num,&pC->Class,pC->name,&pC->finish[0],&pC->finish[1],&pC->finish[2],&pC->finish[3],&pC->finish[4],&pC->finish[5],&pC->finish[6],&pC->finish[7],&pC->finish[8],&pC->finish[9]);
    pC=pC->next;
    while(pC!=NULL)
    {
        pC = (struct student*)malloc(LEN);
        fscanf(fp,"%d %d %s %d %d %d %d %d %d %d %d %d %d\n",&pC->num,&pC->Class,pC->name,&pC->finish[0],&pC->finish[1],&pC->finish[2],&pC->finish[3],&pC->finish[4],&pC->finish[5],&pC->finish[6],&pC->finish[7],&pC->finish[8],&pC->finish[9]);
        pC=pC->next;;
    }
    fclose(fp);
}

void filesave(struct student *head)
{
    FILE *fp;
    struct student *pC = head;

    if((fp=fopen("record.txt","w+"))==NULL)
    {
        printf("文件打开错误!");
        exit(0);
    }
    if(pC==NULL)
        printf("error");
    else
    {
        while(pC!=NULL)
        {
            fprintf(fp,"%d %d %s %d %d %d %d %d %d %d %d %d %d\n",pC->num,pC->Class,pC->name,pC->finish[0],pC->finish[1],pC->finish[2],pC->finish[3],pC->finish[4],pC->finish[5],pC->finish[6],pC->finish[7],pC->finish[8],pC->finish[9]);
            pC=pC->next;
        }    }
    fclose(fp);
}