加书 减书 借书 还书 查书

#include
#include
#include
#include
#include
#include
typedef struct book_type
{
int NO_;//书编号
char name[50];//名字
char author[50];//作者
int num;//本数
struct book_type *next;
struct book_type *pre;
}book;
book *book_end,*book_first;//定义链表首与链表尾
/**************************重复操作***************************/
int again()//返回0不重复
{
char go_on;
printf("是否要继续操作?Y(y)/N(n):");
fflush(stdin);
scanf("%c",&go_on);
while(go_on!='y'&&go_on!='Y'&&go_on!='N'&&go_on!='n')//
{
printf("输入有误，请重新输入:");
fflush(stdin);
scanf("%c",&go_on);
}
if(go_on=='N'||go_on=='n') return 0;
else return 1;
}
/**************************增加图书***************************/
void add_book()
{
system("cls");
printf("\t\t\t\t 增加图书 \t\t\t\t\n");
int flag;
book *temp;
do
{
temp=(book *)malloc(sizeof(book));
if(temp==NULL)
{
cout<<"不能分配空间！清理内存空间后再试。"<// exit(0);
break;
}
cout<<"请输入书本号:";
cin>>temp->NO_;//如果你知道验证输入类型正确性，请加QQ365385495不吝赐教，谢谢
cout<<"请输入书本名字:";
cin>>temp->name;
cout<<"请输入作者名字:";
cin>>temp->author;
cout<<"请输入书本数量:";
cin>>temp->num;
if(book_end==NULL)
{
temp->next=temp;
temp->pre=temp;
book_first=temp;
book_end=temp;
}
else
{
temp->pre=book_end;
temp->next=book_first;
book_end->next=temp;
book_first->pre=temp;
book_end=temp;
}
flag=again();
}while(flag==1);

//cout<pre->pre->NO_<system("Pause");
}
/**************************删除图书***************************/
void del_book()
{
system("cls");
printf("\t\t\t\t 增加图书 \t\t\t\t\n");
int flag,i;
int node;
book *temp;
do
{
temp=book_first;
cout<<"请输入删除的节点编号:";
cin>>node;
if(temp==NULL)
{
cout<<"无任何图书消息"<break;
// exit(0);
}
else
{
while(node<1)
{
cout<<"输入错误！重新输入"<cin>>node;
}
for(i=1;i{
temp=temp->next;
if(temp==book_first)
{
cout<<"没有该节点"<break;
}
}
temp->pre->next=temp->next;
temp->next->pre=temp->pre;
if(node==1) book_first=temp->next;
free(temp);
flag=again();
}
}while(flag==1);

//cout<pre->pre->NO_<system("Pause");
}
/**************************查询图书***************************/
void ind_book()
{
system("cls");
printf("\t\t\t\t 查询图书 \t\t\t\t\n");
book *temp;
temp=book_first;
if(temp==NULL)
cout<<"无任何图书消息"<else
do
{
cout<<"图书编号："<NO_<<" "
<<"图书名字："<name<

<" "
<<"图书作者："<author<<" "
<<"图书数量："<num<temp=temp->next;
}while(temp!=book_first);
system("Pause");
}
/**************************借书***************************/
void borrow()
{
system("cls");
printf("\t\t\t\t 借书 \t\t\t\t\n");
int flag,i;
char book_name[50];
book *temp;
do
{
temp=book_first;
cout<<"请输入希望借阅的书的名称:";
cin>>book_name;
if(temp==NULL)
{
cout<<"无任何图书消息"<// exit(0);
}
else
{
while(strcmp(book_name,temp->name)&&temp->next!=book_first)
temp=temp->next;
if(strcmp(book_name,temp->name)) cout<<"没有该书"<else
{
if(temp->num>0) temp->num-=1;
else cout<<"该书没有库存"<}
}
flag=again();
}while(flag==1);

//cout<pre->pre->NO_<system("Pause");
}
/**************************还书***************************/
void ret()
{
system("cls");
printf("\t\t\t\t 借书 \t\t\t\t\n");
int flag,i;
char book_name[50];
book *temp;
do
{
temp=book_first;
cout<<"请输入归还的书的名称:";
cin>>book_name;
if(temp==NULL)
{
cout<<"无任何图书消息"<// exit(0);
}
else
{
while(strcmp(book_name,temp->name)&&temp->next!=book_first)
temp=temp->next;
if(strcmp(book_name,temp->name)) cout<<"没有该书"<else temp->num+=1;
}
flag=again();
}while(flag==1);

//cout<pre->pre->NO_<system("Pause");}
/**************************主函数***************************/
int main()
{
int flag;
int action;
book_first=book_end=NULL;
while(1)
{
system("cls");
printf("\t\t/*******It is a library system********/\t\t\t\n");
printf("\t\t\t1. 增加图书\t\t\t\n");
printf("\t\t\t2. 删除图书\t\t\t\n");
printf("\t\t\t3. 查询图书\t\t\t\n");
printf("\t\t\t4. 借书\t\t\t\t\n");
printf("\t\t\t5. 还书\t\t\t\t\n");
printf("\t\t\t0. 退出程序\t\t\t\n");
printf("请输入你的操作：");
do
{
flag=0;
fflush(stdin);
scanf("%d",&action);
switch(action)
{
case 1:add_book();break;
case 2:del_book();break;
case 3:ind_book();break;
case 4:borrow();break;
case 5:ret();break;
case 0:exit(0);break;
default:
flag=1;
printf("输入错误，请重新输入：");
}
}while(flag);
}

}