上一个图书管理系统的优化，学习链表逐渐成熟后写的，但是没有用到文件

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct book{
char book_name[30];
int bianhao;
double price;
char author[20];
char state[20];
char name[20];
char sex[10];
int xuehao;
struct book *book_next;
};
struct club
{
char name[20];
char sex[10];
int xuehao;
char borrow[30];
struct club *club_next;
};
void Print_Book(struct book *head_book);/*浏览所有图书信息*/
void Print_Club(struct club *head_club);/*浏览所有会员信息*/
struct book *Create_New_Book();/*创建新的图书库，图书编号输入为0时结束*/
struct book *Search_Book_bianhao(int bianhao,struct book *head_book);/*根据书的编号查找书 */ 
struct book *Search_Book_name(char *b_name,struct book *head_book);/*根据书的书名查找书 */
struct book *Search_Book_price(double price_h,double price_l,struct book *head_book);/*根据书的价格查找书 */
struct book *Insert_Book(struct book *head_book,struct book *stud_book);/*增加图书，逐个添加*/
struct book *Delete_Book(struct book *head_book,int bianhao);/*删除图书*/
struct club *Create_New_Club();/*创建新的会员库，图书编号输入为0时结束*/
struct club *Search_Club_xuehao(int xuehao,struct club *head_club);/*根据会员的学号查找会员 */
struct club *Search_Club_name(char *c_name,struct club *head_club);/*根据会员的姓名查找会员 */
struct club *Insert_Club(struct club *head_club,struct club *stud_club);/*增加会员*/
struct club *Delete_Club(struct club *head_club,int xuehao);/*删除会员*/
struct book *Lent_Book(int bianhao,int xuehao,struct book *head_book,struct club *head_club);/*借书*/ 
struct book *back(int bianhao,int xuehao,struct book *head_book,struct club *head_club);/*还书*/ 
void background1(); 
int main(void)
{
struct book *head_book,*p_book;
char book_name[30],name[20],author[20],sex[10];
int bianhao;
double price,price_h,price_l;
int size_book=sizeof(struct book);
int m=1,n=1,f;
char *b_name,*c_name;
struct club *head_club,*p_club;
int xuehao;

int size_club=sizeof(struct club);
int choice;
printf("\n欢迎您第一次进入图书管理系统!\n\n");
printf("----->[向导]----->[新建图书库]\n\n");
printf("注意:当输入图书编号为0时,进入下一步.\n\n");
head_book=Create_New_Book();
system("cls");
printf("\n欢迎您第一次进入图书管理系统!\n\n");
printf("----->[向导]----->[新建会员库]\n\n");
printf("注意:当输入会员学号为0时,进入主菜单.\n\n");
head_club=Create_New_Club();
system("cls");
do{ 
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("\n");
printf("\t\t\t[1]:借书办理\t");printf(" [6]:还书办理\n");
printf("\t\t\t[2]:查询图书\t");printf(" [7]:查询会员\n");
printf("\t\t\t[3]:添加图书\t");printf(" [8]:添加会员\n");
printf("\t\t\t[4]:删除图书\t");printf(" [9]:删除会员\n");
printf("\t\t\t[5]:遍历图书\t");printf("[10]:遍历会员\n\n");
printf("\t\t\t〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓\n\n");
printf("\t\t\t0:退出\n\n");
printf("请选择<0~10>:");
scanf("%d",&choice);
switch(choice){
case 1:
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("输入所借图书编号:\n");
scanf("%d",&bianhao);
printf("输入借书人的学号:\n");
scanf("%d",&xuehao);
head_book=Lent_Book(bianhao,xuehao,head_book,head_club);
system("cls");
printf("\n借阅成功!\n\n");
printf("相关信息如下:\n\n");
head_book=Search_Book_bianhao(bianhao,head_book);
break;
case 2:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("1.按编号查询\n\n");
printf("2.按名称查询\n\n");
printf("3.按价格区间查询\n\n");
printf("0.返回主菜单\n\n");
printf("请选择:");
scanf("%d",&f);
if(f==1){
printf("请输入查询图书编号:");
   scanf("%d",&bianhao);
   printf("相关信息如下:\n\n");
   head_book=Search_Book_bianhao(bianhao,head_book);
   break;
}
else if(f==2){
b_name=book_name;
getchar();
printf("请输入查询图书名称:");
   gets(b_name);
   printf("相关信息如下:\n\n");
   head_book=Search_Book_name(b_name,head_book);
   break;
}
else if(f==3){
printf("请输入最高价格:");
scanf("%lf",&price_h);
printf("请输入最低价格:");
scanf("%lf",&price_l);
printf("相关信息如下:\n\n");
head_book=Search_Book_price(price_h,price_l,head_book);
break;
}
else if(f==0){
break;
}
break;
case 6:
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("输入所还图书编号:\n");
scanf("%d",&bianhao);
printf("输入还书人的学号:\n");
scanf("%d",&xuehao);
head_book=back(bianhao,xuehao,head_book,head_club);
system("cls");
printf("\n归还成功!\n\n");
printf("相关信息如下:/n/n");
head_book=Search_Book_bianhao(bianhao,head_book);
break;
case 3:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("请输入图书名称:");
       scanf("%s",book_name);
       printf("请输入图书编号:");
       scanf("%d",&bianhao);
       printf("请输入单价:");
       scanf("%lf",&price);
       printf("请输入作者名字:");
       scanf("%s",author);
       printf("\n");
struct book *ptr_b;
       for(ptr_b=head_book;ptr_b;ptr_b=ptr_b->book_next)
{
if(ptr_b->bianhao==bianhao)
{
printf("此编号图书已存在\n");
m=0;
break;
}
}
if(m){
p_book=(struct book *)malloc(size_book);
strcpy(p_book->book_name,book_name);
   p_book->bianhao=bianhao;
   p_book->price=price;
   p_book->xuehao=0;
   strcpy(p_book->author,author);
   strcpy(p_book->state,"存在");
   strcpy(p_book->sex,"待定");
   strcpy(p_book->name,"待定");
head_book=Insert_Book(head_book,p_book);
printf("\n添加图书成功!\n\n");
}
break;
case 4:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("输入删除图书编号:\n");
scanf("%d",&bianhao);
head_book=Delete_Book(head_book,bianhao);
printf("\n删除图书成功!\n\n");
break;
case 5:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
Print_Book(head_book);
break;
case 7:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("1.按学号查询\n\n");
printf("2.按姓名查询\n\n");
printf("0.返回主菜单\n\n");
printf("请选择:");
scanf("%d",&f);
if(f==1){
printf("请输入查询会员学号:");
   scanf("%d",&xuehao);
   printf("相关信息如下:\n\n");
   head_club=Search_Club_xuehao(xuehao,head_club);
   break;
}
else if(f==2){
c_name=name;
getchar();
printf("请输入查询会员姓名:");
   gets(c_name);
   printf("相关信息如下:\n\n");
   head_club=Search_Club_name(c_name,head_club);
   break;
}
else if(f==0){
break;
}
break;
printf("请输入查询会员学号:\n");
scanf("%d",&xuehao);
printf("相关信息如下:\n\n");

break;
case 8:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("请输入会员名字:");
       scanf("%s",name);
       printf("请输入会员性别:");
       scanf("%s",sex);
       printf("请输入会员学号:");
       scanf("%d",&xuehao);
       printf("\n");
struct club *ptr_c;
   for(ptr_c=head_club;ptr_c;ptr_c=ptr_c->club_next)
{
if(ptr_c->xuehao==xuehao)
{
printf("此学号会员已存在\n");
n=0;
break;
}
}
if(n){
p_club=(struct club *)malloc(sizeof(struct club));
   strcpy(p_club->name,name);
   strcpy(p_club->sex,sex);
   p_club->xuehao=xuehao;
   strcpy(p_club->borrow,"暂无");
head_club=Insert_Club(head_club,p_club);
printf("\n添加会员成功!\n\n");
}
break;
case 9:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("输入要删除会员学号:\n");
scanf("%d",&xuehao);
head_club=Delete_Club(head_club,xuehao);
printf("\n删除会员成功!\n\n");
break;
case 10:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
Print_Club(head_club);
break;
case 0:
system("cls");
printf("\n\t\t\t〓〓〓〓〓图书管理系统〓〓〓〓〓\n\n");
printf("\n谢谢您的使用!\n\n");
break;
}
}while(choice!=0);

return 0;
}





struct book *Create_New_Book()
{
struct book *head_book,*p_book;
int bianhao;
double price;
char book_name[30],author[20];
int size_book=sizeof(struct book);

head_book=NULL;
printf("请输入图书名称:");
scanf("%s",book_name);
printf("请输入图书编号:");
scanf("%d",&bianhao);
printf("请输入单价:");
scanf("%lf",&price);
printf("请输入作者名字:");
scanf("%s",author);
printf("\n");
while(bianhao!=0){
p_book=(struct book *)malloc(size_book);
strcpy(p_book->book_name,book_name);
p_book->bianhao=bianhao;
p_book->price=price;
p_book->xuehao=0;
strcpy(p_book->author,author);
strcpy(p_book->state,"存在");
strcpy(p_book->sex,"待定");
strcpy(p_book->name,"待定");
head_book=Insert_Book(head_book,p_book);
printf("请输入图书名称:");
scanf("%s",book_name);
printf("请输入图书编号:");
scanf("%d",&bianhao);
printf("请输入单价:");
scanf("%lf",&price);
printf("请输入作者名字:");
scanf("%s",author);
printf("\n");
}

return head_book;
}
struct book *Search_Book_bianhao(int bianhao,struct book *head_book)
{
struct book *ptr_book;
int flag=0;
for(ptr_book=head_book;ptr_book;ptr_book=ptr_book->book_next)
{
if(ptr_book->bianhao==bianhao){
printf("图书编号:%d\n",ptr_book->bianhao);
printf("图书名称:%s\n",ptr_book->book_name);
printf("图书单价:%.2lf\n",ptr_book->price);
printf("图书作者:%s\n",ptr_book->author);
printf("存在状态:%s\n",ptr_book->state);
printf("借书人姓名:%s\n",ptr_book->name);
printf("借书人性别:%s\n",ptr_book->sex);
printf("学号:%d/n",ptr_book->xuehao);
printf("\n");
flag++;
}
}
if(flag==0){
printf("暂无此图书信息!\n\n");
}
return head_book;
}
struct book *Search_Book_name(char *b_name,struct book *head_book)
{
struct book *ptr_book;
int flag=0;
for(ptr_book=head_book;ptr_book;ptr_book=ptr_book->book_next)
{
if(strcmp(ptr_book->book_name,b_name)==0){
printf("图书编号:%d\n",ptr_book->bianhao);
printf("图书名称:%s\n",ptr_book->book_name);
printf("图书单价:%.2lf\n",ptr_book->price);
printf("图书作者:%s\n",ptr_book->author);
printf("存在状态:%s\n",ptr_book->state);
printf("借书人姓名:%s\n",ptr_book->name);
printf("借书人性别:%s\n",ptr_book->sex);
printf("学号:%d\n",ptr_book->xuehao);
printf("\n");
flag++;
}
}
if(flag==0){
printf("暂无此图书信息!\n\n");
}
return head_book;
}
struct book *Search_Book_price(double price_h,double price_l,struct book *head_book)
{
struct book *ptr_book;
int flag=0;
for(ptr_book=head_book;ptr_book;ptr_book=ptr_book->book_next)
{
if((ptr_book->price>=price_l)&&(ptr_book->price<=price_h)){
printf("图书编号:%d\n",ptr_book->bianhao);
printf("图书名称:%s\n",ptr_book->book_name);
printf("图书单价:%.2lf\n",ptr_book->price);
printf("图书作者:%s\n",ptr_book->author);
printf("存在状态:%s\n",ptr_book->state);
printf("借书人姓名:%s\n",ptr_book->name);
printf("借书人性别:%s\n",ptr_book->sex);
printf("学号:%d\n",ptr_book->xuehao);
printf("\n");
flag++;
}
}
if(flag==0){
printf("暂无此图书信息!\n\n");
}
return head_book;
}
struct book *Delete_Book(struct book *head_book,int bianhao)
{
struct book *ptr1_book,*ptr2_book;

while(head_book!=NULL && head_book->bianhao==bianhao){
ptr2_book=head_book;
head_book=head_book->book_next;
free(ptr2_book);
}
if(head_book==NULL)
return NULL;

ptr1_book=head_book;
ptr2_book=head_book->book_next;
while(ptr2_book!=NULL){
if(ptr2_book->bianhao==bianhao){
ptr1_book->book_next=ptr2_book->book_next;
free(ptr2_book);
}
else
ptr1_book=ptr2_book;
ptr2_book=ptr1_book->book_next;
}

return head_book;
}
struct club *Create_New_Club()
{
struct club *head_club,*p_club;
int xuehao;
char name[20],sex[10];
int size_club=sizeof(struct club);

head_club=NULL;
printf("请输入会员名字:");
scanf("%s",name);
printf("请输入会员性别:");
scanf("%s",sex);
printf("请输入会员学号:");
scanf("%d",&xuehao);
printf("\n");

while(xuehao!=0){
p_club=(struct club *)malloc(size_club);
strcpy(p_club->name,name);
strcpy(p_club->sex,sex);
p_club->xuehao=xuehao;
strcpy(p_club->borrow,"暂无");

head_club=Insert_Club(head_club,p_club);

printf("请输入会员名字:");
scanf("%s",name);
printf("请输入会员性别:");
scanf("%s",sex);
printf("请输入会员学号:");
scanf("%d",&xuehao);
printf("\n");
}

return head_club;
}
struct club *Search_Club_xuehao(int xuehao,struct club *head_club)
{
struct club *ptr_club;
int flag=0;
for(ptr_club=head_club;ptr_club;ptr_club=ptr_club->club_next)
{
if(ptr_club->xuehao==xuehao){
printf("会员姓名:%s\n",ptr_club->name);
printf("会员性别:%s\n",ptr_club->sex);
printf("会员学号:%d\n",ptr_club->xuehao);
printf("所借图书:%s\n",ptr_club->borrow);
printf("/n");
flag++;
}
}
if(flag==0){
printf("此用户不存在!\n\n");
}
return head_club;
}
struct club *Search_Club_name(char *c_name,struct club *head_club)
{
struct club *ptr_club;
int flag=0;
for(ptr_club=head_club;ptr_club;ptr_club=ptr_club->club_next)
{
if(strcmp(ptr_club->name,c_name)==0){
printf("会员姓名:%s\n",ptr_club->name);
printf("会员性别:%s\n",ptr_club->sex);
printf("会员学号:%d\n",ptr_club->xuehao);
printf("所借图书:%s\n",ptr_club->borrow);
printf("/n");
flag++;
}
}
if(flag==0){
printf("此用户不存在!\n\n");
}
return head_club;
}
struct book *Lent_Book(int bianhao,int xuehao,struct book *head_book,struct club *head_club)
{
struct book *ptr_book;
struct club *ptr_club;
int flag=0;

for(ptr_book=head_book;ptr_book;ptr_book=ptr_book->book_next)
for(ptr_club=head_club;ptr_club;ptr_club=ptr_club->club_next)
{
if((ptr_book->bianhao==bianhao)&&(ptr_club->xuehao==xuehao))
{
strcpy(ptr_book->name,ptr_club->name);   /*字符串的复制，把右边的内容复制到左边*/
strcpy(ptr_book->sex,ptr_club->sex);
ptr_book->xuehao=ptr_club->xuehao;
strcpy(ptr_book->state,"暂无");
strcpy(ptr_club->borrow,ptr_book->book_name);
flag++;
}
if(flag==0){
printf("暂无此图书或您还未注册为会员!\n\n");
}
}

return head_book;
}
struct book *back(int bianhao,int xuehao,struct book *head_book,struct club *head_club)
{
struct book *ptr_book;
struct club *ptr_club;
int flag=0;

for(ptr_book=head_book;ptr_book;ptr_book=ptr_book->book_next)
for(ptr_club=head_club;ptr_club;ptr_club=ptr_club->club_next)
{
if((ptr_book->bianhao==bianhao) && (ptr_club->xuehao==xuehao))
{
strcpy(ptr_book->name,"暂无");
strcpy(ptr_book->sex,"待定");
ptr_book->xuehao=0;
strcpy(ptr_book->state,"暂无");
strcpy(ptr_club->borrow,"暂无");
flag++;
}
if(flag==0){
printf("输入有误，请重试\n\n");
}
}

return head_book;
}
struct book *Insert_Book(struct book *head_book,struct book *stud_book)
{
struct book *ptr_b,*ptr1_b,*ptr2_b;
ptr2_b=head_book;
ptr_b=stud_book;
if(head_book==NULL)
{
head_book=ptr_b;
head_book->book_next=NULL;
}
else{
while((ptr_b->bianhao > ptr2_b->bianhao) && (ptr2_b->book_next!=NULL))
{
ptr1_b=ptr2_b;
ptr2_b=ptr2_b->book_next;
}
if(ptr_b->bianhao <= ptr2_b->bianhao){
if(head_book==ptr2_b) head_book=ptr_b;
else ptr1_b->book_next=ptr_b;
ptr_b->book_next=ptr2_b;
}
else{
ptr2_b->book_next=ptr_b;
ptr_b->book_next=NULL;
}
}
return head_book;
}
struct club *Insert_Club(struct club *head_club,struct club *stud_club)
{
struct club *ptr_c,*ptr1_c,*ptr2_c;
ptr2_c=head_club;
ptr_c=stud_club;
if(head_club==NULL){
head_club=ptr_c;
head_club->club_next=NULL;
}
else{
while((ptr_c->xuehao > ptr2_c->xuehao) && (ptr2_c->club_next!=NULL))
{
ptr1_c=ptr2_c;
ptr2_c=ptr2_c->club_next;
}
if(ptr_c->xuehao <= ptr2_c->xuehao)
{
if(head_club==ptr2_c) head_club=ptr_c;
else ptr1_c->club_next=ptr_c;
ptr_c->club_next=ptr2_c;
}
else{
ptr2_c->club_next=ptr_c;
ptr_c->club_next=NULL;
}
}
return head_club;
}
void Print_Club(struct club *head_club)
{
struct club *ptr_c;
if(head_club==NULL){
printf("\n无记录\n\n");
return;
}
printf("\n会员姓名\t会员性别\t会员学号\n\n");
for(ptr_c=head_club;ptr_c;ptr_c=ptr_c->club_next)
printf("%s\t\t%s\t\t%d\n",ptr_c->name,ptr_c->sex,ptr_c->xuehao);
}
struct club *Delete_Club(struct club *head_club,int xuehao)
{
struct club *ptr1_club,*ptr2_club;

while(head_club!=NULL && head_club->xuehao==xuehao){
ptr2_club=head_club;
head_club=head_club->club_next;
free(ptr2_club);
}
if(head_club==NULL)
return NULL;

ptr1_club=head_club;
ptr2_club=head_club->club_next;
while(ptr2_club!=NULL){
if(ptr2_club->xuehao==xuehao){
ptr1_club->club_next=ptr2_club->club_next;
free(ptr2_club);
}
else
ptr1_club=ptr2_club;
ptr2_club=ptr1_club->club_next;
}

return head_club;
}
void Print_Book(struct book *head_book)
{
struct book *ptr_b;
if(head_book==NULL){
printf("\n无记录\n\n");
return;
}
printf("\n图书编号\t图书名称\t图书单价\t图书作者\n\n");
for(ptr_b=head_book;ptr_b;ptr_b=ptr_b->book_next)
printf("%d\t\t%s\t\t%.2lf\t\t%s\n\n",ptr_b->bianhao,ptr_b->book_name,ptr_b->price,ptr_b->author);
}