删除.cpp

由于当时只是学到C语言

#include "1.h"

void del()
{ void store();
  FILE *fp;
  int count,i,flag=0;
  char del_name[20],yes;
  buy_list p,d,head;

  if((fp=fopen("store.txt","r"))==NULL)
  {printf("\n不能打开文件!\n");
   exit(0);
  }
 fread(&count,sizeof(int),1,fp);

p=d=(buy_list1 *)malloc(sizeof(buy_list1));
head=NULL;
for(i=0;i<count;i++)
{if(i==0) head=p;
 else p->next=d;
   p=d;
   d=(buy_list1 *)malloc(sizeof(buy_list1));
   fread(d,sizeof(buy_list1),1,fp);
}
 fclose(fp);

p->next=d;
d->next=NULL;

p=head;

/*while(p)
{printf("%s ",p->name);
p=p->next;} */
printf("输入你要删除的书名,出版社,或者作者\n");
scanf("%s",del_name);getchar();

while(p&&p->next)//p当删除的是最后一个记录时用的.
{ if(!strcmp(p->next->name,del_name)||!strcmp(p->next->author,del_name)||!strcmp(p->next->press,del_name)){
	flag=1;//查找到
  printf("书名:%-15s 作者:%-15s 出版社:%-15s \n",p->next->name,p->next->author,p->next->press);
  printf("以上的书本是否你要删除的(Y/N)?");
 yes=getchar();
  if(yes=='y'||yes=='Y')
  {count--;//节点数减1
	d=p->next;
   p->next=d->next;
   free(d);
  }//  if(yes=='y'||yes=='Y')
}//if

p=p->next;}//while(p)


if(!flag) printf("找不到你所输入的!\n");
p=head->next;

fp=fopen("store.txt","w");
	fwrite(&count,sizeof(int),1,fp);//写节点的数目
    for(i=0;i<count;i++){
		fwrite(p,sizeof(buy_list1),1,fp);
		p=p->next;
	}
fclose(fp);
store();

}