# include & ltiomanip & gt
# include & lt string & gt
# include & ltfstream & gt
# include & ltstdio.h & gt
Use namespace std
const int Maxb = 10000； //The most books
Classroom books//books
{
Int label; //Delete tag 1: Deleted 0: Not deleted.
Int number; //ISBN number
char name[20]； //Book title
Char author [10]; //editor-in-chief
char number 2[ 10]； //version
Character position [20]; //Press
Charging time [20]; //year of publication
Int price; //Pricing
Int onshelf// is on shelf 1: on shelf 0: borrowed?
Public:
Book() {}
char * getname(){ return name； }//Get the name
int get number(){ return number； }//Get ISBN number
int gettag(){ return tag； }//Get delete tag
char * get author(){ return author； }//Get Editor-in-Chief
char * get number 2(){ return number 2； }//Get the version number
char * get position(){ return position； }//get the publishing house
char * gettime(){ return time； }//Get the publication year
char getprice(){ return price； }//Get book pricing Void delbook () {tag =1; }//Delete books
Void addbook (int n, char * na, char * au, char * N2, char * da, char * ti, int pr)// Add books.
{
tag = 0；
Number = n；;
Price = pr
Strcpy (name, not applicable);
Strcpy (author, AU);
Strcpy (number 2, N2);
Strcpy (location, da);
Strcpy (time, ti);
on shelf = 1；
} void disp() // output books
{
cout & lt& ltsetw( 10)& lt； & lt number & lt setw (10) < & lt name & lt& ltsetw( 10)
& lt& ltsetw( 10)& lt； & lt Author & lt< setw (10) < & lt number & lt< setw (10) < & lt location & lt< setw (10) < & lt time & lt setw (10) < & lt price & lt& ltendl
}
}; Class b database//library class
{
Int top// book record pointer
book book[Maxb]； //Book records
Public:
The BDatabase() // constructor reads book.txt into book[].
{
Book b;
top =- 1；
The fstream file ("book.txt", IOs:: in);
while ( 1)
{
file . read((char *)& amp； b，sizeof(b))；
If (! File) interrupt;
top++；
book[top]= b；
}
file . close()；
}
Void clear() // Delete All
{
top =- 1；
}
Intaddbook (int n, char * na, char * au, char * N2, char * da, char * ti, int pr)// Add books.
{
book * p = search 1(n)；
if (p==NULL)
{
top++；
Book [top]. addbook(n，na，au，n2，da，ti，pr)；
Returns1;
}
Returns 0;
}
Book * search1(int bookmark)//Find books.
{
for(int I = 0； I<= topi++)
If (book [me]. getnumber()= = bookid & amp； & amp
Book [me]. gettag()==0)
Return to & book [i];
Returns NULL
} book * search2 (int bookmark, char * name)// Search books by title.
{
for(int I = 0； I<= topi++)
If(strcmp (book [i]). getname()，name)==0)
{bookid=book[i]。 get number()； & ltbr & gt returns & book [i]; & ltbr & gt}
Returns NULL
} book * search3 (int bookid, char * author)// press the editor to search for books.
{
for(int I = 0； I<= topi++)
If(strcmp (book [i]). getauthor()，author)==0)
{bookid=book[i]。 get number()； & ltbr & gt returns & book [i]; & ltbr & gt}
Returns NULL
} void book data()； //Library maintenance
Invalid display ()
{
cout & lt& ltsetw( 10)& lt； & lt "Book Number"
for(int I = 0； I<= topi++)
If (book [me]. gettag()==0)
Book [me]. disp()；
}
~BDatabase() // destructor, and write book[] into the book.txt file.
{
The fstream file ("book.txt", IOs:: out);
for(int I = 0； I<= topi++)
If (book [me]. gettag()==0)
file . write((char *)& amp； book[i]，sizeof(book[I])；
file . close()；
}
}; void BDatabase::bookdata()
{
int choice = 1；
int choice 2 = 1；
int choice 3 = 1；
int choice4
char bname[40]；
A character editor [40];
char banci[40]；
Charging position [40];
char year[40]；
Int value;
int bookid
Book * b；;
And (choose! =0)
{
cout & lt& ltendl & lt& ltendl
cout & lt& lt“* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *”& lt； & ltendl
Cout & lt< "* *1add a book * * * * *”& lt；; & ltendl
Cout & lt< "* * * Three Delete Books * * *"
Cout & lt< "* * * 4 book query * * *"
Cout & lt< "* * * 5 shows this book * * *"
Cout & lt< "* * * 6 Delete all * * * * *”& lt；; & ltendl
Cout & lt< "* * * 7 Borrowing books * * *"
Cout & lt< "* * * 8 Return the book * * *"
Cout & lt< "* * * 0 exits * * * * *”& lt；; & ltendl
cout & lt& lt“* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *”& lt； & ltendl & lt& ltendl
Cout & lt& ltendl & lt& lt "Please press the key to select the operation you need:";
CIN & gt； & gt selection;
And (choose! = 1。 & choose! = 2 & choose! = 3&& choose! = 4 & choose! = 5 & choose! = 6 & choose! =0){
The number you entered does not exist in cout & lt& ltendl & lt& lt“* * menu, please re-enter * * *”& lt；; & lt\ a ' & lt& ltendl & lt& ltendl
Cout & lt& lt "Please select the operation you need:";
CIN & gt； & gt selection;
}
Switch (selection)
{
Case 1:
Cout & lt& lt "Enter ISBN (it must be a number, otherwise it will be abnormal):";
CIN & gt； & gtbookid
Cout & lt& lt "Enter a title:";
CIN & gt； & gtbname
Cout & lt& lt "input editor:";
CIN & gt； & gt Editor;
Cout & lt& lt "Enter the version (it must be a number, otherwise it will be abnormal):";
CIN & gt； & gt Banchi;
Cout < < "Enter the publisher:";
CIN & gt； & gt location;
Cout & lt& lt "Enter the publication year (it must be a number, otherwise it will be abnormal)";
CIN & gt； & gt year;
Cout & lt& lt "Enter the price (it must be a number, otherwise it will be abnormal):";
CIN & gt； & gt value;
addbook(bookid，bname，editor，banci，position，year，value)；
Cout & lt< "ISBN" < & ltbookid & lt "added successfully. If you want to return to the main menu, press 1 to exit the system, press 0 (be sure to enter a number)";
CIN & gt； & gt Select 4;
While (choose 4! = 0 & choose 4! = 1)
{
Cout & lt& lt is entered incorrectly, please re-enter.
CIN & gt； & gt Select 4; }
Switch (option 4)
{
Case 1:
choice = 1；
Break;
Case 0:
choice = 0；
Break; } broken;
Case 3:
Cout < < "Enter ISBN:";
CIN & gt； & gtbookid
b = search 1(bookid)；
if (b==NULL)
{
Cout & lt& lt "This book doesn't exist"
Break;
}
b-& gt； del book()；
Break;
Case 4:
Cout & lt& lt "Search method:"
CIN & gt； & gt option 3;
Switch (option 3)
{
Case 1:
{cout & lt& lt "Enter ISBN:"; //query by ISBN number < br & gtCIN & gt；; & gtbookid& ltbr & gtb = search 1(bookid)； & ltbr & gtif(b = = NULL)& lt； Br>{ & ltbr & gtcout & lt& lt "This book doesn't exist"
b-& gt； disp()；
}
Break;
Case 2:
{
Cout & lt& lt Please enter a title: ";
CIN & gt； & gtbname
b=search2(bookid，bname)；
if(b==NULL)
{
Cout & lt& lt "This book doesn't exist!" & lt& ltendl
Break;
}
b-& gt； disp()；
}
Break;
Case 3:
{
Cout & lt& lt "Please enter editor in chief:";
CIN & gt； & gt Editor;
b=search3(bookid，editor)；
if(b==NULL)
{
Cout & lt& lt "The editor-in-chief does not exist!" & lt& ltendl
Break;
}
b-& gt； disp()；
}
Break;
}
Break;
Case 5:
disp()；
Break;
Case 6:
clear()；
Break;
} }
Cout & lt& ltendl & lt& lt“* * * * * Go slow * * * * "< < endl & lt& ltendl & lt& ltendl
};
int main()
{
B database BookDB
cout & lt& ltendl & lt& ltendl & lt& ltendl
Cout & lt& lt "Welcome to SCU Library" & ltendl
Cout & lt& lt "Welcome to Sichuan University Library" < & ltendl
Cout & lt& ltendl & lt& ltendl & lt& lt "Please enter 0 to enter the library"
int w；
CIN & gt； & gtw；
If (w==0)
bookdb . book data()；
System ("suspended");
Returns 0;
}