C语言通讯录管理系统设计 第4页

C语言通讯录管理系统设计 第4页
printf("2.Delete a record.\n");
printf("3.Show all records.\n");
printf("4.Search a record.\n");
printf("5.Save address book.\n");
printf("6.Quit\n");
do{
  printf("\nInput your choice:");
  c=getche();
  }while (c<'0'||c>'6');
return c-48;
}

void add()
{
struct address *info;
for (;;){
  info=(struct address *)malloc(sizeof(list_entry));
  if (!info){
    printf("\nout of memory");
  return;
  }
  inputs("\nName:",info->name,15);
  if (!info->name[0]) break;
  inputs("Street:",info->street,15);
  inputs("City:",info->city,15);
  inputs("State:",info->state,15);
  inputs("Eip:",info->eip,15);
  start=dls_store(info,start);
  }
}
inputs(char *prompt,char *s,int count)
{
char p[255];
do{
  printf(prompt);
  gets(p);
  if (strlen(p)>count) printf("\ntoo long\n");
  }while (strlen(p)>count);
  strcpy(s,p);
}
struct address *dls_store(struct address *i,struct address *top)
{
struct address *old,*p;
if (last==NULL){
  i->next=NULL;
  i->prior=NULL;
  last=i;
  return i;
  }
p=top;
old=NULL;
while(p){
  if (strcmp(p->name,i->name)<0){
    old=p;p=p->next;
    }
  else{
    if(p->prior){
      p->prior->next=i;
      i->next=p;
      i->prior=p->prior;
      p->prior=i;
      return top;
      }
    i->next=p;
    i->prior=NULL;
    p->prior=i;
    return i;
    }
  }
  old->next=i;
  i->next=NULL;
  i->prior=old;
  last=i;
  return start;
}

delete()
{
struct address *info;
char s[80];
printf("\nInput name(delete):");
gets(s);
info=find(s);
if (info) {
  if (start==info){
    start=info->next;
    if (start)
      start->prior=NULL;
    else
      last=NULL;
    }
  else{
    info->prior->next=info->next;
    if(info!=last)
      info->prior->next=info->prior;
else
      last=info->prior;
    }
  free(info);

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