# Including
# Including
# Including
#include// input/output file stream class
usingnamespacestd
constit maxr = 100； //The most readers
constit maxb = 100； //The most books
constitmaxbor = 5； //Each reader can borrow up to five books.
//reader class, which describes the information of readers.
Class reader
{
Private:
Inttag// delete tag 1: deleted 0: not deleted.
Intno// reader number
charname[ 10]； //Reader's name
intborbook[max bor]； //Borrow books
Public:
Reader(){}
char * getname(){ return name； }//Get the name
int gettag(){ return tag； }//Get delete tag
int getno(){ return no； }//Get the reader number
Voidsetname(charna[])// Set the name.
{
Strcpy (name, not applicable);
}
void del book(){ tag = 1； }//Set the delete flag 1: Deleted 0: Not deleted.
Voida reader(intn, char * na)// Add a reader.
{
tag = 0；
no = n；
Strcpy (name, not applicable);
for(inti = 0； ibor book[I]= 0；
}
Voidborrowbook(intbookid)// Borrowing operation
{
for(inti = 0； I {
if(borbook[i]==0)
{
bor book[I]= bookid；
Return;
}
}
}
Intro Book(intbookid)// book return operation
{
for(inti = 0； I {
if(borbook[i]==bookid)
{
bor book[I]= 0；
return 1；
}
}
return0
}
Voiddisp()// Read the reader information.
{
Standard output
for(inti = 0； iif(borbook[i]！ =0)
Standard output
Standard output
}
};
//reader class library, to realize the establishment of readers' personal data.
Classified database
{
Private:
Inttop// reader record pointer
reader read[Maxr]； //Reader record
Public:
The RDatabase()// constructor reads reader.txt into read[].
{
Readers;
top =- 1；
fstreamfile("reader.txt "，IOs::in)； //Open an input file
while( 1)
{
file . read((char *)& amp； s，sizeof(s))；
If (! File) interrupt;
Top;
read[top]= s；
}
file . close()； //close reader.txt
}
Voidclear()// Delete all reader information.
{
top =- 1；
}
Intaddreader(intn, char*na)// When adding readers, check whether they exist.
{
reader * p = query(n)；
if(p==NULL)
{
Top;
Read [top]. addreader(n，na)；
return 1；
}
return0
}
Reader*query(intreaderid)// Search by number.
{
for(inti = 0； I
If (read [me]. getno()= = readerid & amp； & amp
Read [me]. gettag()==0)
{
Change & to [i];
}
returnNULL
}
Voiddisp()// Output all reader information.
{
for(inti = 0； I
Read [me]. disp()；
}
voidreaderdata()； //Reader Library Maintenance
~RDatabase()// destructor, write read[] to the reader.txt file.
{
fstreamfile("reader.txt "，IOs::out)；
for(inti = 0； I
If (read [me]. gettag()==0)
file . write((char *)& amp； read[i]，sizeof(read[I])；
file . close()；
}
};
voidRDatabase::readerdata()
{
charchoice
charr name[20]；
intreaderid
reader * r；
And (choose! ='0')
{
Standard output
CIN & gt； & gt selection;
Switch (selection)
{
Case "1":
Standard output
CIN & gt； & gtreaderid
Standard output
CIN & gt； & gtrname
addreader(readerid，rname)；
Break;
Case "2":
Standard output
CIN & gt； & gtreaderid
r = query(readerid)；
if(r==NULL)
{
Standard output
Break;
}
Standard output
CIN & gt； & gtrname
r-& gt； set name(rname)；
Break;
Case "3":
Standard output
CIN & gt； & gtreaderid
r = query(readerid)；
if(r==NULL)
{
Standard output
Break;
}
r-& gt； del book()；
Break;
Case "4":
Standard output
CIN & gt； & gtreaderid
r = query(readerid)；
if(r==NULL)
{
Standard output
Break;
}
r-& gt； disp()；
Break;
Case "5":
disp()；
Break;
Case "6":
clear()；
Break;
Default value: cout
}
}
}
//Book category, which realizes the description, book number, title, lending and return of books.
Roll call book
{
Private:
Inttag// delete tag 1: deleted 0: not deleted.
Intno// book number
charname[20]； //Book title
Intonshelf// Do you want to borrow 1: Borrow 2: Borrow?
Public:
Book(){}
char * getname(){ return name； }//Get the name
int getno(){ return no； }//Get the book number
int gettag(){ return tag； }//Get delete tag
Voidsetname(charna[])// Set the title of the book.
{
Strcpy (name, not applicable);
}
void del book(){ tag = 1； }//Delete books
Voidaddbook(intn, char*na)// Add books.
{
tag = 0；
no = n；
Strcpy (name, not applicable);
on shelf = 1；
}
Intborrowbook()// Book borrowing operation
{
if(on self = = 1)
{
on shelf = 0；
return 1；
}
return0
}
Voidretbook()// Book Return Operation
{
on shelf = 1；
}
Voiddisp()// output books
{
Standard output
}
};
//Library class, which can maintain, search and delete books.
Class b database
{
Private:
Inttop// book record pointer
book book[Maxb]； //Book records
Public:
The BDatabase()// constructor reads book.txt into book[].
{
Bookb
top =- 1；
fstreamfile("book.txt "，IOs::in)；
while( 1)
{
file . read((char *)& amp； b，sizeof(b))；
If (! File) interrupt;
Top;
book[top]= b；
}
file . close()；
}
Voidclear()// Delete All
{
top =- 1；
}
Intaddbook(intn, char*na)// Add books.
{
book * p = query(n)；
if(NULL==p)
{
Top;
Book [top]. addbook(n，na)；
return 1；
}
return0
}
Book*query(intbookid)// find books.
{
for(inti = 0； I
If (book [me]. getno()= = bookid & amp； & Book [me]. gettag()==0)
{
Return to & book [i];
}
returnNULL
}
voidbookdata()； //Library maintenance
voiddisp()
{
for(inti = 0； I
If (book [me]. gettag()==0)
Book [me]. disp()；
}
~BDatabase()// destructor, and write book[] into the book.txt file.
{
fstreamfile("book.txt "，IOs::out)；
for(inti = 0； I
If (book [me]. gettag()==0)
file . write((char *)& amp； book[i]，sizeof(book[I])；
file . close()；
}
};
void db database::book data()
{
charchoice
charb name[40]；
intbookid
Book * b；;
And (choose! ='0')
{
Standard output
Standard output
CIN & gt； & gt selection;
Switch (selection)
{
Case "1":
Standard output
CIN & gt； & gtbookid
Standard output
CIN & gt； & gtbname
addbook(bookid，bname)；
Break;
Case "2":
Standard output
CIN & gt； & gtbookid
B = BookID;
if(b==NULL)
{
Standard output
Break;
}
Standard output
CIN & gt； & gtbname
b-& gt； set name(bname)；
Break;
Case "3":
Standard output
CIN & gt； & gtbookid
B = BookID;
if(b==NULL)
{
Standard output
Break;
}
b-& gt； del book()；
Break;
Case "4":
Standard output
CIN & gt； & gtbookid
B = BookID;
if(b==NULL)
{
Standard output
Break;
}
b-& gt； disp()；
Break;
Case "5":
disp()；
Break;
Case "6":
clear()；
Break;
Default value: cout
}
}
}
//The realization of the main () function and the guidance of the main interface of the program.
voidmain()
{
charchoice
intbookid，readerid
RDatabaseReaderDB
reader * r；
BDatabaseBookDB
Book * b；;
And (choose! ='0')
{
Standard output
Standard output
CIN & gt； & gt selection;
Switch (selection)
{
Case "1":
Standard output
CIN & gt； & gtreaderid
Standard output
CIN & gt； & gtbookid
r = readerdb . query(readerid)； //Search by number
if(NULL==r)
{
Standard output
Break;
}
b = bookdb . query(bookid)；
if(b==NULL)
{
Standard output
Break;
}
if(b-& gt； borrowbook()==0)
{
Standard output
Break;
}
r-& gt； Borrowing books (b-> getno())；
Break;
Case "2":
Standard output
CIN & gt； & gtreaderid
Standard output
CIN & gt； & gtbookid
r = readerdb . query(readerid)；
if(r==NULL)
{
Standard output
Break;
}
b = bookdb . query(bookid)；
if(b==NULL)
{
Standard output
Break;
}
b-& gt； ret book()；
r-& gt； retbook(b-& gt； getno())；
Break;
Case "3":
bookdb . book data()；
Break;
Case "4":
reader db . reader data()；
Break;
Default value: cout
}
}
}