C + + to achieve a simple library management system _c language

Today to introduce another common management system-book management system, I hope we can hands-on practice, the following to share with you the fruits of my labor.

Book information includes: Login number, title, author name, category number, publishing unit, publication time, Price and so on. Try to design a book information management system, so that it can provide the following functions:
(1) Book information input function (book Information file preservation)
(2) Library information browsing function
(3) Query and sorting function: (At least one query method)
. Search by Title
. Query by author name
(4) The deletion and modification of book information

Share the code as follows

#include <iostream.h> #include <conio.h>//console data input and output function #include <fstream.h>//file stream #include < iomanip.h>//Control Data output format #include <string.h> const int maxr=100;//MAX number of readers const int maxb=100; Max number of Books const int maxbor=5; Each reader borrows most books class book {//books category, realizes to the book description, the book number, the book title, borrows, also enters and so on function private:int tag;//delete Mark 1: deleted 0: not deleted int no;//book Number char name[ 20]; Title Char author[20];//author Char fenlei[20];//classification number char cbs[20]; Publishing house int cbtime;//Publishing Time double bookprice;//book price int onshelf; 
Whether to rack 1: Again 2: Lent Public:book () {;} 
Char *getname () {//Get title return name; 

Char *getauthorname () {//Get author name return author;} 
Char *getfenlei () {//Get category number return Fenlei} char *getcbsname () {//Get Publisher name return CBS;
  int Getcbtime () {//Get publication Time return cbtime} double Getbookprice () {//Get book price return bookprice; int Getno () {//Get book Number 
return no; 
int Gettag () {//Get delete tag return tag; 
} void SetName (char na[]) {//Set title strcpy (Name,na); } void Setauthorname (char aa[]) {//Set author name strcpy(AUTHOR,AA);

} void Setfenlei (char fe[]) {//Set category number strcpy (FENLEI,FE);} void Setcbs (char ca[]) {//Set publishing house strcpy (CBS,CA);} 
void Setcbtime (int time) {//set cbtime=time;} 
void Setbookprice (double price) {//Set book prices Bookprice=price} void setonshelf (int oa) {Onshelf=oa;}
 void Delbook () {//delete book char i; cout<< "OK delete?" y/n? "
 <<endl;
 cin>>i; if (i== ' y ') | |
i== ' Y ') tag=1; 
  } void Addbook (int n,char *na,char *aa,char *fe,char *ca,int-time,double OA) {//add book Price,int; 
  No=n;
  strcpy (Name,na);
  strcpy (AUTHOR,AA);
  strcpy (CBS,CA);
  strcpy (FENLEI,FE);
  Cbtime=time;
  Bookprice=price; 
Onshelf=oa;
  int Borrowbook () {//Library operation if (onshelf>0) {onshelf--; 
  return 1; 
return 0; 
} void Retbook () {//book return operation onshelf++; } void Disp () {//Output book COUT&LT;&LT;SETW (3) &LT;&LT;NO&LT;&LT;SETW (a) &LT;&LT;NAME&LT;&LT;SETW <<author<& LT;SETW (a) &LT;&LT;FENLEI&LT;&LT;SETW <<cbs<<setw (a) &LT;&LT;CBTIME&LT;&LT;SETW (10) &LT;&LT;BOOKPRICE&LT;&LT;SETW <<onshelf<<endl; 


} 
}; Class Bdatabase {//library category, to achieve the maintenance of books, find, delete and other private:int top;//books Record pointer book BOOK[MAXB];//Library Records Public:bdatabase () {//Construction letter 
  Number, read Book.txt to book[] in book B; 
  Top=-1; 
  FStream file ("Book.txt", ios::in); 
  while (1) {File.read ((char *) &b,sizeof (b)); 
  if (!file) break; 
  top++; 
  Book[top]=b; 
} file.close ();
 void Clear () {//delete all char i; cout<< "OK to delete all?" y/n? "
 <<endl;
 cin>>i; if (i== ' y ') | | 
i== ' Y ') top=-1; 
  int addbook (int n,char *na,char *aa,char *fe,char *ca,int time, double Price,int oa) {//Add book *p=query1 (n); 
  if (null==p) {top++; 
  Book[top].addbook (N,NA,AA,FE,CA,TIME,PRICE,OA); 
  return 1; 
return 0; Book *query1 (int bookid) {//Lookup books by number for (int i=0;i<=top;i++) if (Book[i].getno () ==bookid &&book[i].gett 
  AG () ==0) {return &book[i]; 
return NULL;
  Book *query2 (char a[]) {//Find books by title *e; int r=0; for (int i=0;i<=top;i++) if (strcmp (Book[i].getname (), a) ==0 &&book[i].gettag () ==0) {if (r==0) cout&lt ; &LT;SETW (3) << "numbered" &LT;&LT;SETW (a) << "title" &LT;&LT;SETW (a) << "author" <<setw (a) << "classification number" &LT;&LT;SETW << "Publishing house" &LT;&LT;SETW (a) << "publication Time" &LT;&LT;SETW (a) << "book Price" &LT;&LT;SETW (a) <
   < "stock" <<endl;
   e=&book[i];
   E->disp (); 
  r++; if (r==0) cout<< "Can't find the book!"
   <<endl; 
return NULL;
  Book *query3 (char a[]) {//Find books by author *e;
  int r=0;
   for (int i=0;i<=top;i++) if (strcmp (Book[i].getauthorname (), a) ==0 &&book[i].gettag () ==0) {if (r==0) COUT&LT;&LT;SETW (3) << "numbered" &LT;&LT;SETW (a) << "title" &LT;&LT;SETW (a) << "author" <<setw (a) < < "&LT;&LT;SETW" << "Publishing house" &LT;&LT;SETW (a) << "publication Time" &LT;&LT;SETW (a) << "book Price" &LT;&LT;SETW
    (a) << "stock" <<endl;
   e=&book[i];
   E->disp (); 
  r++; if (r==0) cout<< "Can't find the book!" <<endl; 
return NULL;
  Book *query4 (char a[]) {//Find books by publisher *e;
  int r=0; for (int i=0;i<=top;i++) if (strcmp (Book[i].getcbsname (), a) ==0 &&book[i].gettag () ==0) {if (r==0) COUT&L T;&LT;SETW (3) << "numbered" &LT;&LT;SETW (a) << "title" &LT;&LT;SETW (a) << "author" <<setw (a) << "classification number" &LT;&LT;SETW << "Publishing house" &LT;&LT;SETW (a) << "publication Time" &LT;&LT;SETW (a) << "book Price" &LT;&LT;SETW (a) <
   < "stock" <<endl;
   e=&book[i];
   E->disp (); 
  r++; if (r==0) cout<< "Can't find the book!"
   <<endl; 
return NULL; } void BookData (); 
Library information Void disp () {for (int i=0;i<=top;i++) if (Book[i].gettag () ==0) Book[i].disp (); 
  ~bdatabase () {//destructor, writes book[] to the Book.txt file FStream files ("Book.txt", ios::out); 
  for (int i=0;i<=top;i++) if (Book[i].gettag () ==0) file.write ((char *) &book[i],sizeof (book[i)); 
File.close (); 
} 
}; 
void Bdatabase::bookdata () {char choice3;
Char bname[40];//title char auname[40];//author nameChar bfenlei[40];//classification number char cname[40];//publishing house int time;//Publishing time double price;//price char ch;
int Choice4;
int BookID;
int Bookod; 
Book *b; 
  while (choice3!= ' 0 ') {cout<< "\n\t\t\t** book information **\n" <<endl;
  cout<< "\t\t\t** 1 Add * *" <<endl;
  cout<< "\t\t\t** 2. Change * * <<endl;
  cout<< "\t\t\t** 3. Delete * * <<endl;
  cout<< "\t\t\t** 4. Find * * <<endl;
  cout<< "\t\t\t** 5. Show * * <<endl;
  cout<< "\t\t\t** 6" All deleted * * * <<endl; 
  cout<< "\t\t\t** 0. Return * * <<endl;
  cout<< "\t\t\t Please choose:"; 
  cin>>choice3; 
  Switch (choice3) {case ' 1 ': cout<< "Please enter the new book Number:";
 
  cin>>bookid; 
  B=query1 (BookID); if (b!=null) {cout<< "the number already exists and cannot be added!"
   <<endl; 
  Break 
  cout<< "Please enter the title of the new book:";
  cin>>bname; 
  cout<< "Please enter the name of the new book Author:";
 cin>>auname;
 cout<< "Please enter the new book category number:";
  cin>>bfenlei; 
  cout<< "Please enter new book publishing house:";
 cin>>cname; cout<< "Please enter new book publication Time:";
 cin>>time;
 cout<< "Please enter the book Price:";

  cin>>price; 
  cout<< "Please enter the number of new books:";
 cin>>bookod;
 

 Addbook (Bookid,bname,auname,bfenlei,cname,time,price,bookod);
 Char Choice2;
  {cout<< "\n\t\t\t** save y/n? **\n" <<endl; cout<< "\t\t\t** 1.
  Y Save * * <<endl; cout<< "\t\t\t** 0.
 N Do not save * * <<endl;
cout<< "\t\t\t Please choose:";
cin>>choice2;
 
 Switch (CHOICE2) {case ' 1 ': cout<< "add book success!";
Break
Case ' 0 ': break; 
  } getch (); 
  Break 
  Case ' 2 ': cout<< "Please enter the book Number:"; 
  cin>>bookid; 
  B=query1 (BookID); if (b==null) {cout<< "The book does not exist!"
   "<<endl; 
  Break
  cout<< "The information for this book is:" <<endl; COUT&LT;&LT;SETW (3) << "numbered" &LT;&LT;SETW (a) << "title" &LT;&LT;SETW (a) << "author" <<setw (a) < < "&LT;&LT;SETW" << "Publishing house" &LT;&LT;SETW (a) << "publication Time" &LT;&LT;SETW (a) << "book Price" &LT;&LT;SETW
  (a) << "stock" <<endl; B->disp (); cout<< "Is it modified?"
  (y/n): ";
  cin>>ch; if (ch== ' y ') | |
  ch== ' Y ') {int A; 
  cout<< "\n\t\t\t** Book Modification **\n" <<endl;
  cout<< "\t\t\t** 1. Change the title * * <<endl;
  cout<< "\t\t\t** 2. Modify Author * * <<endl;
  cout<< "\t\t\t** 3. Modify the category number * * * <<endl;
  cout<< "\t\t\t** 4. Modify Publishing House * * <<endl;
  cout<< "\t\t\t** 5. Revise publication time * * <<endl;
  cout<< "\t\t\t** 6. Revise Book price * * * <<endl;
  cout<< "\t\t\t** 7. Change the number of books * * * <<endl; 
  cout<< "\t\t\t** 0. Return * * <<endl;
  cout<< "\t\t\t Please choose:"; 
cin>>a; 
   Switch (a) {case 1:cout<< "Please enter a new title:"; cin>>bname; B->setname (bname);
Break
   Case 2:cout<< "Please enter a new author:"; cin>>auname; B->setauthorname (Auname);
Break
 Case 3:cout<< "Please enter a new category number:"; cin>>bfenlei; B->setfenlei (Bfenlei);
Break
   Case 4:cout<< "Please enter new book publishing house:"; cin>>cname; B->setcbs (CNAME);
Break
Case 5:cout<< "Please enter new book publication Time:"; Cin>>time;b->setcbtime (time);
Break
 Case 6:cout<< "Please enter the book Price:"; cin>>price; B->setbookprice (price);
Break 
   Case 7:cout<< "Please enter a new stock:"; cin>>bookod; B->setonshelf (Bookod);
Break
 Case 0:break;
  } cout<< "Modify book success!"; 
   Getch ();
  Break 
  Case ' 3 ': cout<< "Please enter the book Number:"; 
  cin>>bookid; 
  B=query1 (BookID); if (b==null) {cout<< "The book does not exist, cannot be deleted!"
   <<endl; 
  Break
  } b->delbook ();
  cout<< "Delete success!";
  Getch (); 
  Break
  Case ' 4 ': cout<< ' \n\t\t\t** 1. Find by Book Number * * <<endl;
  cout<< "\t\t\t** 2. Search by Book title * * <<endl;
  cout<< "\t\t\t** 3. Search by Book author * * <<endl;
  cout<< "\t\t\t** 4. Search by Book publishing house * * <<endl; cout<< "\t\t\t** 0.
  Back to * * <<endl; 
  cout<< "\t\t\t Please choose:";
  cin>>choice4; 
   Switch (choice4) {case 1:cout<< "Please enter the book Number:";
   cin>>bookid;
   B=query1 (BookID);
   if (b==null) {cout<< "The book does not exist!"; 
Break   COUT&LT;&LT;SETW (3) << "numbered" &LT;&LT;SETW (a) << "title" &LT;&LT;SETW (a) << "author" <<setw (a) < < "&LT;&LT;SETW" << "Publishing house" &LT;&LT;SETW (a) << "publication Time" &LT;&LT;SETW (a) << "book Price" &LT;&LT;SETW
   (a) << "stock" <<endl; 
   B->disp ();   
  Break 
   Case 2:cout<< "Please enter book title:";
   cin>>bname;
   B=query2 (bname);
  Break 
   Case 3:cout<< "Please input book author:";
   cin>>auname;
   B=query3 (Auname);
  Break 
   Case 4:cout<< "Please input book publishing house:";
   cin>>cname;
   B=query4 (CNAME);
  Break
  Case 0:break;
  } break; Case ' 5 ': COUT&LT;&LT;SETW (3) << "numbered" &LT;&LT;SETW (Ten) << "title" &LT;&LT;SETW (a) << "author" &LT;&LT;SETW (10 << "&LT;&LT;SETW" << "Publishing house" &LT;&LT;SETW (a) << "publication Time" &LT;&LT;SETW (a) << "book Price" <
   &LT;SETW << "Stock" <<endl;
   Disp (); 
   Getch (); 
  Break 
   Case ' 6 ': Clear (); 
  Break 
  Default:break; Class Reader {//reader's Information description private: int tag; Delete Mark 1 means that 0 has been deleted to indicate that int no is not deleted; Reader number char name[20]; Reader name int Borbook[maxbor]; 
Borrowed book Public:reader ()//constructor {;}
Friend Ostream &operator<< (ostream &output,reader &rd) {output<<rd.no; output<< "";
output<<endl;
return output;}

Char *getname () {//Get name return name; 
int Gettag () {//Get delete tag return tag; 
int Getno () {//Get reader number return no; 
} void SetName (char na[]) {//Set name strcpy (Name,na);
 void Delbook () {//Set deletion Mark 1: deleted 0: not deleted char i; cout<< "OK delete?" y/n? "
 <<endl;
 cin>>i; if (i== ' y ') | | 
i== ' Y ') tag=1; 
  } void Addreader (int n,char *na) {//Add reader tag=0; 
  No=n; 
  strcpy (Name,na); 
for (int i=0;i<maxbor;i++) borbook[i]=0; } void Borrowbook (int bookid) {//library operation for (int i=0;i<maxbor;i++) {if (borbook[i]==0) {Borbook[i]=book
   Id 
  return; 
        {Retbook int bookid) {//book return operation for (int i=0;i<maxbor;i++) {if (Borbook[i]==bookid) { Borbook[i]=0; cout<< "book Success!"
   <<endl; 
  return 1; } cout<< "did not borrow the book, The return failed!"
  <<endl; 
return 0;
  } void Disp () {//Read reader information int have=0;
  int bz=0;
  COUT&LT;&LT;SETW (5) &LT;&LT;NO&LT;&LT;SETW &LT;&LT;NAME&LT;&LT;SETW (15);
   for (int i=0;i<maxbor;i++) if (borbook[i]!=0) {if (bz==0) {have=1;      
   cout<< "[" <<borbook[i]<< "]\t\t" <<endl;
   bz++; 
   else {cout<< "\r\t\t\t\t\t" "[" <<borbook[i]<< "]\t\t" &LT;&LT;SETW () <<endl;
} if (have==0) cout<< "\ t has not yet borrowed a book" <<endl;

}
}; Class Rdatabase {//Reader class library, to achieve the establishment of the reader's personal data private:int top;//reader record pointer reader READ[MAXR];//reader Record public:rdatabase () {//construct 
  Create a function to read Reader.txt to read[] in reader s;  
  Top=-1; FStream file ("Reader.txt", ios::in); 
  Opens an input file while (1) {File.read ((char *) &s,sizeof (s)); 
  if (!file) break; 
  top++; 
  Read[top]=s; } file.close (); Turn off Reader.txt file} void Clear () {//deleteAll reader information char i; cout<< "OK to delete all?" y/n? "
 <<endl;
 cin>>i; if (i== ' y ') | | 
i== ' Y ') top=-1; 
  int addreader (int n,char *na) {/////Add reader first to find reader *p=queryid (n); 
  if (p==null) {top++; 
  Read[top].addreader (N,na); 
  return 1;
  else cout<< "The number already exists!"; 
return 0; Reader *queryid (int readerid) {//find for by Reader ID for (int i=0;i<=top;i++) if (Read[i].getno () ==readerid&&read 
  [I].gettag () ==0) {return &read[i];
return NULL; Reader *queryname (char readername[10]) {//lookup by Reader name for (int i=0;i<=top;i++) if (strcmp Read[i].getnam 
  E (), readername) ==0 && Read[i].gettag () ==0) {return &read[i]; 
return NULL; void disp () {//output all reader information for (int i=0;i<=top;i++) if (Read[i].gettag () ==0) read[i 
].disp (); } void Readerdata (); 
  Reader Library Information ~rdatabase () {//destructor, writes read[] to the Reader.txt file FStream files ("Reader.txt", ios::out); for (int i=0;i<=top;i++) IF (Read[i].gettag () ==0) file.write ((char *) &read[i],sizeof (read[i)); 
File.close ();

} 
}; 
void Rdatabase::readerdata () {char choice1; 
Char rname[20];
int Readerid;
Char readername[10];
int choice2; 
Reader *r;
  while (choice1!= ' 0 ') {cout<< "\n\t\t\t** reader information **\n" <<endl; cout<< "\t\t\t** 1.
  Add * * "<<endl; cout<< "\t\t\t** 2.
  Change * * <<endl; cout<< "\t\t\t** 3.
  Delete * * "<<endl; cout<< "\t\t\t** 4.
  Find * * <<endl; cout<< "\t\t\t** 5.
  Show * * <<endl; cout<< "\t\t\t** 6.
  Delete all * * * <<endl; cout<< "\t\t\t** 0. 
  Back to * * <<endl;
  cout<< "\t\t\t Please choose:"; 
  cin>>choice1; 
  Switch (CHOICE1) {case ' 1 ': cout<< "Please enter reader number:";
  cin>>readerid; 
  cout<< "Please enter the reader's name:";
  cin>>rname;
  Addreader (Readerid,rname); cout<< "Add reader success!"
  <<endl;
  Getch ();
  Break 
  Case ' 2 ': cout<< "Please input reader number:"; 
  cin>>readerid; R=Queryid (Readerid); if (r==null) {cout<< "The reader does not exist!" 
   "<<endl; 
  Break 
  cout<< "Please enter a new name:"; 
  cin>>rname; 
  R->setname (Rname); cout<< "Modify reader success!"
  <<endl;
  Getch ();
  Break 
  Case ' 3 ': cout<< "Please input reader number:"; 
  cin>>readerid; 
  R=queryid (Readerid); 
   if (r==null) {cout<< "The reader does not exist!") << Endl; 
  Break
  } r->delbook (); cout<< "Delete Successful!"
  <<endl;
    Getch (); 
  Break
  Case ' 4 ': cout<< ' \n\t\t\t** 1. Find by Reader number * * <<endl;
  cout<< "\t\t\t** 2. Search by Reader name * * <<endl;
  cout<< "\t\t\t** 0. Return * * <<endl; 
  cout<< "\t\t\t Please choose:";
  cin>>choice2; 
   Switch (CHOICE2) {case 1:cout<< "Please enter reader number:";
   cin>>readerid; 
   R=queryid (Readerid); if (r==null) {cout<< "The reader does not exist!") 
   << Endl; 
   Break
    COUT&LT;&LT;SETW << "Reader id" <<setw << "reader's name" &LT;&LT;SETW (a) << "library number" <<endl; r-&Gt;disp ();   
  Break 
   Case 2:cout<< "Please enter the reader's name:"; 
   cin>>readername; 
   R=queryname (Readername); if (r==null) {cout<< "The reader does not exist!")
   <<endl; 
   Break
    COUT&LT;&LT;SETW << "Reader id" <<setw << "reader's name" &LT;&LT;SETW (a) << "library number" <<endl;
    R->disp ();
   Break
  Case 0:break;
  } break; Case ' 5 ': COUT&LT;&LT;SETW << "Reader ID" &LT;&LT;SETW (s) << "reader's name" &LT;&LT;SETW () << "Library number" <
  <endl;
  Disp (); 
  Getch (); 
  Break
  Case ' 6 ': Clear (); 
  Break 
  Default:break; 
 }} class Maindesk//Implementing the main interface of the program {char choice5;
 Char Choice2;
  Double xh,mm; 
  int Bookid,readerid; 
  Rdatabase Readerdb; 
  Reader *r; 
  Bdatabase bookdb;
Book *b;

Public:maindesk () {;} int Denglu () {int k=0; cout<< "\n\t\t\t Welcome to the Library Management system!"
<<endl;
cout<< "\t\t\t you a total of 3 landing opportunities" <<endl; while (choice2!= ' 0 ') {++k; cout<< "\t\t\t * * * 1. Login * *" <<eNdl cout<< "\t\t\t * * 0.
Exit * * <<endl;
cout<< "\t\t\t Please choose:";
cin>>choice2;
  Switch (CHOICE2) {case ' 1 ': cout<< "Please enter school number and password" <<endl;
  

  
  cin>>xh>>mm; 
   if ((xh>=138325039) && (xh<=138325039) && (xh==mm)) {cout<< Login succeeded <<endl;
  Enterdesk (); } if ((xh<138325039) | | (xh>138325039) | |
  (XH!=MM))
   {cout<< "Login failed: You also have" <<3-k<< "Landing Opportunities" <<endl; if (k>=3) {cout<< "You have exceeded the maximum number of logins, the system automatically exits!"
  <<endl;
 
 return 1;
 } continue;

} break;
Case ' 0 ': break;}
return 1;
return 0; 
  } void Enterdesk () {while (choice5!= ' 0 ') {cout<< "\n\t\t\t**** Book Management system ****\n\n";
  cout<< "\t\t\t** 1. Book Info * * <<endl;
  cout<< "\t\t\t** 2. Reader Information * * <<endl;
  cout<< "\t\t\t** 3. Borrow Books * *" <<endl;
  cout<< "\t\t\t** 4. Return of Books * *" <<endl;   cout<< "\t\t\t** 0. 
  Exit * * <<endl; cout<< "\t\t\t Please choose: "; 
    cin>>choice5; 
  Switch (choice5) {case ' 1 ': Bookdb.bookdata (); 
  Break 
  Case ' 2 ': Readerdb.readerdata (); 
  Break
  Case ' 3 ': cout<< "\t\t\t\t Library operation" <<endl; 
  cout<< "Please enter the Library reader number:";
  cin>>readerid;      
  R=readerdb.queryid (Readerid); if (null==r) {//by number find out if there is a reader cout<< "there is no such reader, you cannot borrow books!"
   <<endl; 
  Break 
      cout<< "Please enter the book number to borrow:";  
      cin>>bookid;       
      B=bookdb.query1 (BookID); if (b==null) {//by number find out whether there is the book cout<< "does not exist in the book, can not borrow books!"
   <<endl; 
  Break if (B->borrowbook () ==0) {cout<< "The book has been borrowed and cannot borrow books!"
   <<endl; 
  Break cout<< "Readers to borrow books successfully!"
  <<endl;
    R->borrowbook (B->getno ());  
  Break
  Case ' 4 ': cout<< "\t\t\t\t book operation" <<endl; 
  cout<< "Please enter the book Reader number:";
      cin>>readerid;
  R=readerdb.queryid (Readerid);
   if (r==null) {cout<< "does not exist the reader, cannot return the book" <<endl;Break 
  cout<< "Please enter the book number to return:"; 
  cin>>bookid; 
  B=bookdb.query1 (BookID); 
   if (b==null) {cout<< "does not exist this book, cannot return books" <<endl; 
  Break 
      } b->retbook ();
  R->retbook (B->getno ());
  Break
  Case ' 0 ': break; 
  Default:break;
} 
} 
}
};
 void main ()//main function {Maindesk yourdesk; if (Yourdesk.denglu ()) cout<< "\t\t Thank you for using, Goodbye!"

<<endl;

 }

Run Effect chart:

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