C语言通讯录管理系统设计 第5页
struct address *find(char *name)
{
struct address *info;
info=start;
while(info){
  if(!strcmp(name,info->name)) return info;
  info=info->next;
  }
printf("name not found\n");
return NULL;
}
void list()
{
struct address *info;
info=start;
printf("\n%-15s%-15s%-15s%-15s%-15s\n",
  "name","street","city","state","eip");
while(info){
  display(info);
  info=info->next;
  }
printf("\n\n");
}

void display(struct address *info)
{
printf("%-17s%-15s%-14s%-15s%-6s\n",
  info->name,info->street,info->city,info->state,info->eip);
}
void search()
{
char name[40];
struct address *info,*find();
printf("\nInput a name to search:");
gets(name);
info=find(name);
if(!info)
  printf("Not found\n");
else
  display(info);
}

void save()
{
struct address *info;
FILE *fp;
if((fp=fopen("address","wb"))==NULL){
  printf("\nCan't open file.\n");
  exit(1);
  }
printf("\nSave file success.\n");
info=start;
while(info){
  fwrite(info,sizeof(struct address),1,fp);
  info=info->next;
  }
fclose(fp);
}

void load()
{
struct address *info,*temp=NULL;
FILE *fp;
if((fp=fopen("address","rb"))==NULL){
  printf("\nCan't open file\n");
  return;
  }
while(start){
  info=start->next;
  free(info);
  start=info;
  }
printf("\nLoading file success.\n");
start=(struct address *)malloc(sizeof(struct address));
if(!start){
  printf("Out of memory!\n");
  return;
  }
info=start;
while(!feof(fp)){
  if(1!=fread(info,sizeof(struct address),1,fp)) break;
  info->next=(struct address *)malloc(sizeof(struct address));
  if (!info->next){
    printf("Out of memory\n");
    return;
    }
  info->prior=temp;
  temp=info;
  info=info->next;
  }
temp->next=NULL;
last=temp;
start->prior=NULL;
fclose(fp);}

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