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胡大

新虫 (初入文坛)

应助: 0 (幼儿园)
金币: 11.5
帖子: 7
在线: 1.8小时
虫号: 1998566
注册: 2012-09-13
专业: 通信理论与系统

[求助] 如何添加save函数使第一次的数据能在第二次被读取出来！求大神搭救！

#include
#include
#include
#include
#define ID struct id
struct id
  {
char name[20];
int num;
char price[20];
char sum[20];
ID *next;
  }Market;
struct id *head=NULL;
int pc=0;
void save();
int read();
ID *creat()
{
  ID *p1,*p2,*head;
  int pd;
  p1=p2=head=NULL;
  printf("请输入数字(0为终止符)!\n");
  printf("*********************************************************\n");
  while(1)
  {
printf("请输入商品编号:\n");scanf("%d",&pd);
if(pd==0) break;
p1=(ID*)malloc(sizeof(ID));
p1->num=pd;
printf("请输入商品名称:\n");scanf("%s",p1->name);
printf("请输入商品单价:\n");scanf("%s",p1->price);
printf("请输入商品总量:\n");scanf("%s",p1->sum);
if(head==NULL)
{
   head=p1;
   p2=p1;
}
else
{
   p2->next=p1;
   p2=p1;
}
pc++;
  }
  p2->next=NULL;
  return(head);
}
ID *insert(ID *head)
{
  ID *temp,*p1,*p2;
  printf("开始插入!!!\n");
  temp=(ID *)malloc(sizeof(ID));
  printf("请输入商品编号:\n");scanf("%d",&temp->num);
  printf("请输入商品名称:\n");scanf("%s",temp->name);
  printf("请输入商品单价:\n");scanf("%s",temp->price);
  printf("请输入商品总量:\n");scanf("%s",temp->sum);
  if(head==NULL)
  {
head=temp;
temp->next=NULL;
  }
  else
  {
p1=head;
while(p1!=NULL)
{
   p2=p1;
   p1=p1->next;
}
p2->next=temp;
temp->next=p1;
  }
  printf("成功插入!");
  pc++;
  return(head);
}
ID *delet(ID *head)
{
  ID *p1,*p2;
  int num;
  printf("请输入要删除货物的编号:");scanf("%d",&num);
  p1=head;
  if(head==NULL)
  {
printf("无历史纪录\n");
goto end;

  }
  while(num!=p1->num&&p1!=NULL)
  {
p2=p1;p1=p1->next;
  }
  if(num==p1->num)
  {
if(p1==head)
head=p1->next;
else
p2->next=p1->next;
printf("成功删除!!!\n");
pc--;
  }
  end:return head;
}
ID *search_name(ID *head)
{
  ID *p1,*p2;
  char str[100];
  printf("请输入要查找货物的编号:");scanf("%s",str);
  p1=head;
  while(strcmp(str,p1->name)&&p1!=NULL)
  {
p2=p1;p1=p1->next;
  }
  if(strcmp(str,p1->name)==0)
  {
printf("商品编号:%d\n",p1->num);
printf("商品名称:%s\n",p1->name);
printf("商品单价:%s\n",p1->price);
printf("商品总量:%s\n",p1->sum);
  }
  return head;
}
ID *search_num(ID *head)
{
  int num;
  ID *p1,*p2;
  printf("请输入要货物的编号:");scanf("%d",&num);
  p1=head;
  while(num!=p1->num&&p1!=NULL)
  {
p2=p1;p1=p1->next;
  }
  if(num==p1->num)
  {
printf("商品编号:%d\n",p1->num);
printf("商品名称:%s\n",p1->name);
printf("商品单价:%s\n",p1->price);
printf("商品总量:%s\n",p1->sum);
  }
  return head;
}
ID *search(ID *head)
{
int mode;
ID *h;
printf("请选择搜索方式:方法1.num  方法2.name\n");
scanf("%d",&mode);
if(mode==1)
h=search_num(head);
else if(mode==2)
h=search_name(head);
else
printf("输入错误!\n");
return h;
}
void print(ID *head)
{
ID *p;
p=head;
printf("\t\t\t******************\n");
printf("结果列表显示 :\n");
if(head!=NULL)
do
{
   printf("编号%-10d 名称%-10s 单价%-10s 总量%-10s\n",p->num,p->name,p->price,p->sum);
   p=p->next;
}while(p!=NULL);
}
void save()//保存收入
{

FILE *fp;
if((fp=fopen("d:\\market.din","wb"))==NULL)
{
printf("cannot open file\n");
exit(1);
}
fwrite(&head,sizeof(int),1,fp);
if(fwrite(Market,sizeof(struct  id),4,fp)!=4)
printf("file write error");
   fclose(fp);
}
int read()
{
FILE *fp;
if((fp=fopen("d:\\market.din","rb"))==NULL)
{
return 1;
}
fread(&head,sizeof(int),1,fp);
if(fread(Market,sizeof(struct  id),4,fp)!=4)
{
printf("read error");
exit (1);}
fclose(fp);
}

void main()
{
   ID *head=NULL;
   int choise;
   head=read();
   printf("\t\t*****大型仓库管理系统*****\n");
   while(1)
   {
   printf("\t\t 商品管理系统公测版本\n");
   printf("|*********************************************************|\n");
   printf("|**|                      1.输入                   |**|\n");
   printf("|**|                      2.显示                   |**|\n");
   printf("|**|                      3.搜索                   |**|\n");
   printf("|**|                      4.插入                   |**|\n");
   printf("|**|                      5.删除                   |**|\n");
   printf("|**|                      0.退出                   |**|\n");
   printf("|*********************************************************|\n");
   printf("请选择服务项目(0-6):");
   scanf("%d",&choise);
   switch(choise)
   {
   case 1:head=creat();
   break;
   case 2:print(head);
   break;
   case 3:head=search(head);
   break;
   case 4:head=insert(head);
   break;
   case 5:head=delet(head);
   break;
   case 0:
   exit(0);
   break;
   default:printf("输入错误! 请重新输入!\n");
   }
   }save ();
}

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