求大神帮忙看下 代码怎么不能将文件中的内容导入到链表中
#include<stdio.h>#include<string.h>
#include<stdlib.h>
struct book{
int num;
char name[20];
double price;
char writer[20];
struct book*next;};
struct book*sortdata(struct book*head);
struct book*insert(struct book*head,struct book*b);
struct book*Delete(struct book*head,int num);
struct book*search(struct book*head,int num);
void print(struct book*head);
int main(void)
{
FILE *fp;
struct book*head,*p,*tail,*ptr;
int num,choice;
char name[20],writer[20];
double price;
int size=sizeof(struct book);
head=tail=NULL;
if((fp=fopen("c:\\book.txt","r"))==NULL)
{ printf("File open error!\n");
exit(0);
}
while(num!=0)
fscanf(fp,"%d%s%lf%s",p->num,p->name,p->price,p->writer);
while(num!=0){
p=(struct book*)malloc(size);
p->num=num;
strcpy(p->name,name);
p->price=price;
strcpy(p->writer,writer);
p->next=NULL;
if(head==NULL)
head=p;
else
tail->next=p;
tail=p;
scanf("%d%s%lf%s",&num,name,&price,writer);}
do{
printf("1:排序 2：插入 3:删除 4:查找 5:输出 0：Exit\n");
scanf("%d",&choice);
switch(choice){
case 1:
head=sortdata(head);
break;
case 2:
printf("输入一个图书信息 num,name,price,writer:\n");
scanf("%d%s%lf%s",&num,name,&price,writer);
p=(struct book*)malloc(size);
p->num=num;
strcpy(p->name,name);
p->price=price;
strcpy(p->writer,writer);
head=insert(head,p);
break;
case 3:
printf("输入要删除图书书号 num:\n");
scanf("%d",&num);
head=Delete(head,num);
break;
case 4:
printf("输入要查找图书书号 num:\n");
scanf("%d",&num);
ptr=search(head,num);
printf("%d %s %lf %s\n",ptr->num,ptr->name,ptr->price,ptr->writer);
break;
case 5:
print(head);
break;
case 0:
break;
}
}while(choice!=0);
return 0;
}
struct book*sortdata(struct book*head)
{struct book*ptr1,*ptr2,*ptr3;
ptr1=head;
ptr2=head->next;
while(ptr2!=NULL){
ptr3=ptr2;
if(ptr1->num>ptr3->num)
{ ptr1->num=ptr3->num;
strcpy(ptr1->name,ptr3->name);
ptr1->price=ptr3->price;
strcpy(ptr1->writer,ptr3->writer);
ptr3=ptr3->next;}
ptr1=ptr2;
ptr2=ptr2->next;
}
return head;
}
struct book*insert(struct book*head,struct book*b)
{
struct book*ptr,*ptr1,*ptr2;
ptr2=head;
ptr=b;
if(head==NULL){
head=ptr;
head->next=NULL;
}
else{
while((ptr->num>ptr2->num)&&(ptr2->next!=NULL)){
ptr1=ptr2;
ptr2=ptr2->next;
}
if(ptr->num<=ptr2->num){
if(head==ptr2) head=ptr;
else ptr1->next=ptr;
ptr->next=ptr2;
}
else{
ptr2->next=ptr;
ptr->next=NULL;
}
}
return head;
}
struct book*Delete(struct book*head,int num)
{
struct book*ptr1,*ptr2;
while(head!=NULL&&head->num==num){
ptr2=head;
head=head->next;
free(ptr2);
}
if(head==NULL)
return NULL;
ptr1=head;
ptr2=head->next;
while(ptr2!=NULL){
if(ptr2->num==num){
ptr1->next=ptr2->next;
free(ptr2);
}
else
ptr1=ptr2;
ptr2=ptr1->next;
}
return head;
}
struct book*search(struct book*head,int num)
{struct book*p,*ptr;
if(head==NULL)
printf("图书馆中没有存入图书\n");
for(ptr=head;ptr!=NULL;ptr=ptr->next)
if(ptr->num==num)
p=ptr;
return p;
}
void print(struct book*head)
{
struct book*ptr;
if(head==NULL){
printf("No Recods\n");
return;
}
printf("全部图书信息:\n");
printf("编号\t书名\t作者\t价格\n");
for(ptr=head;ptr!=NULL;ptr=ptr->next)
printf("%d %s %lf %s\n",ptr->num,ptr->name,ptr->price,ptr->writer);
}
[ 本帖最后由 yzjj 于 2015-5-19 22:50 编辑 ]
求大神