# include & ltiostream & gt
# include & ltfstream & gt
# include & lt string & gt
Use namespace std
Structured book information
{
char log in name[ 10]；
char bookname[20]；
Char author [20];
Number of characters [5];
char date[ 10]；
Double the price;
};
Structural node
{
struct BookInfo book
Structure node * next
};
void option()；
void select()；
Node * header;
node * pt[ 10]；
FILE * fp
//Create a linked list
/*
Node *CrtNode(int n)
{
Node * header; //Declare the head pointer head
Nodes *p, * s；;
Head = new node; //Create the Head node pointed by the head (empty head node)
S = head;
Cout & lt& lt "Please enter book information:"
for(int I = 0； I & ltn；; i++)
{
P = new node; //Create a node
Cout & lt& lt' login name:';
CIN . getline(p-& gt； book.loginname， 10)；
strcat(p-& gt； book.loginname，" \ n ")；
Cout & lt& lt "title:";
CIN . getline(p-& gt； book.bookname，20)；
strcat(p-& gt； book.bookname，" \ n ")；
Cout & lt& lt Author's name:;
CIN . getline(p-& gt； book.author，20)；
strcat(p-& gt； book.author，" \ n ")；
Cout & lt& lt "classification number:";
CIN . getline(p-& gt； book.number，5)；
strcat(p-& gt； book.number，" \ n ")；
Cout & lt& lt "Release date:";
CIN & gt； & gtp->； book.date
strcat(p-& gt； book.date，" \ n ")；
Cout & lt& lt price: ";
CIN & gt； & gtp->； book.price
s-& gt； next = p； //Point the created node to the next one of S.
s = p； //The pointer S moves backward by one node.
CIN . clear()；
CIN . sync()；
}
p->； Next = NULL// The next of the last node points to null.
Return head; //Returns the head pointer
}
*/
/*
strcat(p-& gt； book.loginname，" \ n ")；
strcat(p-& gt； book.bookname，" \ n ")；
strcat(p-& gt； book.author，" \ n ")；
strcat(p-& gt； book.number，" \ n ")；
strcat(p-& gt； book.date，" \ n ")；
*/
// 1. Insert
Null Insert (Node * Header)
{
Nodes *p, * s；;
S = head;
Cout & lt& lt "Please enter book information:"
P = new node;
CIN . clear()；
Cout & lt& lt' login name:';
CIN . getline(p-& gt； book.loginname， 10)；
strcat(p-& gt； book.loginname，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt "title:";
CIN . getline(p-& gt； book.bookname，20)；
strcat(p-& gt； book.bookname，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt Author's name:;
CIN . getline(p-& gt； book.author，20)；
strcat(p-& gt； book.author，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt "classification number:";
CIN . getline(p-& gt； book.number，5)；
strcat(p-& gt； book.number，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt "Publication date (yyyy-mm-dd):";
CIN & gt； & gtp->； book.date
strcat(p-& gt； book.date，" \ n ")；
Cout & lt& lt price: ";
CIN & gt； & gtp->； book.price
while(s->； Next)
s = s-& gt； Next;
s-& gt； next = p；
p->； next = NULL
}
//initialization
Node * Initial ()
{
Node * header;
Head = new node;
head->； next = NULL
Return head;
}
//2. Show all information
Empty display (node * header)
{
int I = 1；
node * p；
//Display all nodes except the head node (because the head node is empty when it is created)
p = head-& gt； Next;
if(p == NULL)
{
Cout & lt& lt "system does not store any book information. Please enter the book information before other operations! " & lt& ltendl
}
other
{
Cout & lt& lt“* * * * * * * * * Here are all the books and materials * * * * * * * ".
And (p! = empty)
{
Cout & lt& lt "book"
Cout & lt& lt "Login name:"
Cout & lt& lt "Title:"
Cout & lt& lt "Author's name:"
Cout & lt& lt "Classification number:"
Cout & lt& lt "Publication date:"
Cout & lt& lt "Price:"
cout & lt& ltendl
p = p-& gt； Next;
i++；
cout & lt& ltendl
}
}
Cout & lt& lt "Please press Enter to return to the menu." & lt& ltendl
CIN . get()；
}
//3. Discover
Int findauthor (constant node * header)
{
Node * ps
Char author [20];
int count = 0；
PS = head-& gt； Next;
Cout & lt& lt "Please enter the author's name:";
Cin.getline (author, 20);
Strcat (author, "\ n");
while(ps)
{
if(strcmp(PS-& gt； book.author，author) == 0)
{
pt[0]= PS；
count++；
}
PS = PS-& gt； Next;
}
if(count == 0)
Cout & lt& lt "The book you are looking for does not exist!" & lt& ltendl
Returns the count;
}
Int findbookname name (constant node * header)
{
Node * ps
char bookname[20]；
int count = 0；
int I = 0；
PS = head-& gt； Next;
Cout & lt& lt Please enter a title: ";
cin.getline(bookname，20)；
Strcat (book name, "\ n");
while(ps)
{
if(strcmp(PS-& gt； book.bookname，bookname) == 0)
{
pt[I]= PS；
count++；
i++；
}
If (PS->; next ==NULL)
Break;
PS = PS-& gt； Next;
}
if(count == 0)
Cout & lt& lt "The book you are looking for does not exist!" & lt& ltendl
Returns the count;
}
void Showarray(int n)
{
Cout & lt& lt“* * * * * * * * * * This is the book you are looking for * * * * * * ".
for(int I = 0； I & ltn；; i++)
{
Cout & lt& lt "book"
Cout & lt& lt "Login name:"
Cout & lt& lt "Title:"
Cout & lt& lt "Author's name:"
Cout & lt& lt "Classification number:"
Cout & lt& lt "Publication date:"
Cout & lt& lt "Price:"
cout & lt& ltendl
}
CIN . get()；
}
Int Find (node * header)
{
int n，num
System ("CLS");
if(head-& gt； next == NULL)
{
Cout & lt& lt "system does not store any book information. Please enter the book information before other operations! " & lt& ltendl
CIN . get()；
}
other
{
Cout & lt& lt Please select a search method (1. Search by author name 2. Search by title):;
CIN & gt； & gtn；
CIN . clear()；
CIN . sync()；
Switch (n)
{
Case 1:
num = find author(head)；
If (num! = 0)
show array(num)；
Break;
Case 2:
num = findbookname(head)；
If (num! =0)
show array(num)；
Break;
Default value:
Cout & lt& lt "Wrong input, please re-enter!" & lt& ltendl
CIN . get()；
System ("CLS");
option()；
select()；
}
}
Quantity returned;
}
//4. Modify the book information
Invalid modification (node * header)
{
Nodes *p, *q, * s；;
p = head-& gt； Next;
int i，n；
if(p == NULL)
Cout & lt& lt "system does not store any book information. Please enter the book information before other operations! " & lt& ltendl
other
{
Cout & lt& lt "Please enter the name of the book whose information needs to be corrected:"
n = findbookname(head)；
showarray(n)；
Cycle:
{
Cout & lt& lt "Please select the book information to modify:";
}
CIN & gt； & gt me;
CIN . clear()；
CIN . sync()；
If (i>0& < = n)
{
Cout & lt& lt“* * * * * First Amendment "
Cout & lt& lt' login name:';
CIN . getline(pt[I- 1]-& gt； book.loginname， 10)；
strcat(pt[I- 1]-& gt； book.loginname，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt Author's name:;
CIN . getline(pt[I- 1]-& gt； book.author，20)；
strcat(pt[I- 1]-& gt； book.author，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt "classification number:";
CIN . getline(pt[I- 1]-& gt； book.number，5)；
strcat(pt[I- 1]-& gt； book.number，" \ n ")；
CIN . clear()；
CIN . sync()；
Cout & lt& lt "Publication date (yyyy-mm-dd):";
CIN & gt； & gtpt[I- 1]-& gt； book.date
strcat(pt[I- 1]-& gt； book.date，" \ n ")；
Cout & lt& lt price: ";
CIN & gt； & gtpt[I- 1]-& gt； book.price
}
other
{
Cout & lt& lt "The serial number of the selected book is wrong!" ;
Go to loop;
}
}
CIN . get()；
}
//5. Delete book information
void Deletebook(Node *head)
{
Nodes *p, * q；;
char bookname[20]；
int count = 0；
int I = 0；
P = head;
q = p->； Next;
if(q == NULL)
Cout & lt& lt "There is no book information in the system!" & lt& ltendl
other
{
Cout & lt& lt Please enter a title: ";
cin.getline(bookname，20)；
Strcat (book name, "\ n");
And (q! = empty)
{
q = p->； Next;
if(strcmp(q-& gt； book.bookname，bookname) == 0)
{
p->； next = q-& gt； Next;
Delete q;
count++；
}
p = q；
q = q-& gt； Next;
}
if(count == 0)
Cout & lt& lt "No book information found!" & lt& ltendl
other
Cout & lt& lt "Book information has been deleted!" & lt& ltendl
}
CIN . get()；
}
//Linked list length
Int Len (constant node * header)
{
Node * ps
int count = 0；
PS = head-& gt； Next;
while(ps)
{
count++；
PS = PS-& gt； Next;
}
Returns the count;
}
//6. Save the file
Invalid save (node * header)
{
node * p；
char ST[20]；
p = head-& gt； Next;
if((fp=fopen("book.dat "，" w ")= = NULL)
{
Cout & lt& lt "Unable to open file"
Return;
}
char t[255]；
//Assign L 1.listlen () to the number in the string.
int lenth = Len(head)；
fwrite(& amp； lenth，sizeof(int)， 1，FP)；
while(p)
{
fwrite(p，sizeof(struct Node)， 1，FP)；
p = p-& gt； Next;
}
fclose(FP)；
Cout & lt& lt "file has been saved, please press Enter to exit!" & lt& ltendl
CIN . get()；
}
//8. Delete all book information.
Void Free_List (node * header)
{
node * p；
p = head-& gt； Next;
while(p)
{
Delete p;
p = head-& gt； Next;
}
}
/*
void readstr(FILE *f，char *string)
{
do
{
//①: Read a line first.
fgets(string，255，f)； //fgets (): read a string with the length of 255- 1 from the file F.
//and store it in a string.
} while((string[0]= = '/')| |(string[0]= = ' \ n ')；
Return;
}
*/
//Read the file
Node * Load ()
{
char c[255]；
int lenth
Nodes *p, * q；;
Head = new node;
P = head;
if((fp=fopen("book.dat "，" r ")= = NULL)
{
Cout & lt& lt "Unable to open file"
Return head;
}
other
Fred (& amplenth, sizeof(int), 1, fp);
for(int I = 0； I & ltlenthi++)
{
Q = new node;
fread(q，sizeof(struct Node)， 1，FP)；
p->； next = q；
p = q；
}
p->； next = NULL
fclose(FP)；
Return head;
}
//9. Menu options
Invalid selection ()
{
int m，n；
Cout & lt& lt Please enter the following numbers to select the required operation (1~ 8):;
CIN . clear()；
CIN . sync()；
CIN & gt； & gtn；
CIN . clear()；
CIN . sync()；
Switch (n)
{
Case 1:
System ("CLS");
To insert (a head);
Break;
Case 2:
System ("CLS");
Show (head);
Break;
Case 3:
System ("CLS");
Find (the head);
Break;
Case 4:
System ("CLS");
Modify (header);
Break;
Case 5:
System ("CLS");
delete book(head)；
Break;
Case 6:
Save (header);
Break;
Case 7:
Exit (0);
Break;
Case 8:
Free_List (header);
Break;
Default value:
Break;
}
}
// 10. Menu interface
Void option ()
{
Cout & lt& lt "Book Information Management System"
cout & lt& lt“* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *”& lt； & ltendl
Cout & lt& lt" 1. Enter the book information 2. Output book information "
Cout & lt& lt"3. Find book information 4. Modify the book information "
Cout & lt& lt"5. Delete book information 6. Save book information "
Cout & lt& lt"7. Exit the system "
cout & lt& lt“* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *”& lt； & ltendl
}
int main()
{
//head = Initial()；
Header = load ();
while( 1)
{
System ("CLS");
option()；
select()；
}
Returns 0;
}