C文件信息的误删与恢复之编程

 printf("是否将回收站的数据还原？Y/N /n"); ch=getchar(); ch=getchar(); if(ch=='n'||ch=='N') printf("不需要还原！"); else { while(1) { if(strcmp(p1->num,num)==0)  break; else  p1=p1->next; } while(!feof(fp)) { fread(p,sizeof(struct student),1,fp); if(strcmp(p1->num,p->num)==0) {  strcpy(p1->name,p->name);  strcpy(p1->sex,p->sex);  p1->age=p->age;  strcpy(p1->birth,p->birth);  p1->tele=p->tele;  strcpy(p1->addr,p->addr);  strcpy(p1->party,p->party);  printf("d dddddddddddddd/n");  break;} } } writetxt(head);