4.cpp

图书管理系统

#include <iostream.h>
#include <iomanip.h>
#include <string.h>
#include <fstream.h>
const int Maxr=100;//最多的读者
const int Maxb=100;//最多的图书
const int Maxbor=5;//每位读者最多借五本书
class Reader       //读者类
{   
    private:
 int tag;  //删除标记 1:已删 0:未删
 int no;   //读者编号
 char name[10];  //读者姓名
 int borbook[Maxbor];//所借图书
    public:
  Reader() {}
     char *getname() {return name;}      //获取姓名
  int gettag() {return tag;}         //获取删除标记
     int getno() {return no;}           //获取读者编号
     void setname(char na[])            //设置姓名
  { 
     strcpy(name,na);
  
  }
 void delbook(){  tag=1;  }//设置删除标记
 void addreader(int n,char *na)//增加读者
 { 
  tag=0;
  no=n;
  strcpy(name,na);
  for(int i=0;i<Maxbor;i++)
   borbook[i]=0;
 }
 void borrowbook(int bookid)//借书操作
 {
  for(int i=0;i<Maxbor;i++)
  { 
   if (borbook[i]==0)
   {
    borbook[i]=bookid;
    return;
    
   }
  }
  
 }
 int retbook(int bookid)//还书操作
 { 
  for(int i=0;i<Maxbor;i++)
  { 
   if(borbook[i]==bookid)
   {
   borbook[i]=0;
   return 1;
   
   }
  }
  return 0;
 }
 void disp()//读出读者信息
 { 
  cout << setw(5) << no <<setw(10) << name<<"借书编号：[";
  for(int i=0;i<Maxbor;i++)
   if(borbook[i]!=0)
    cout << borbook[i] << "|";
  cout << "]"<<endl;
   
 }
};
 class RDatabase//读者类库
{  
private:
   int top;       //读者记录指针
   Reader read[Maxr];//读者记录
public:
 RDatabase()   //构造函数，将reader.txt读到read[]中
 {
  Reader s;
  top=-1;
  fstream file("reader.txt",ios::in);
  while (1)
  {
   file.read((char *)&s,sizeof(s));
   if (!file)break;
   top++;
   read[top]=s;
  }
  file.close();
 }
    void clear()//删除所有读者信息
 {
  top=-1;
 }
 int addreader(int n,char *na)//添加读者时先查找是否存在
 {
  Reader *p=query(n);
  if (p==NULL)
  {
    top++;
    read[top].addreader(n,na);
    return 1;
  }
  return 0;

 }
 Reader *query(int readerid)//按编号查找
 {
  for (int i=0;i<=top;i++)
   if (read[i].getno()==readerid && 
   read[i].gettag()==0)
   {
    return &read[i];
   }
   return NULL;
 }
 void disp()  //输出所有读者信息
 {
           for (int i=0;i<=top;i++)
      read[i].disp();
 }
 void readerdata();//读者库维护
 ~RDatabase()  //析构函数，将read[]写到reader.txt文件中
 {
  fstream file("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()
{

    int choice=1;
 char rname[20];
 int readerid;
 Reader *r;
 while (choice!=0)
 {
  cout <<"读者维护 1: 新增 2: 更改 3:删除 4:查找 5:显示 6:全删 0:退出=>";
  cin >> choice;
  switch (choice)
  {
            case 1:
    cout << "输入读者编号:";
    cin >> readerid;
    cout << "输入读者姓名:";
    cin >> rname;
    addreader (readerid,rname);
    break;
            case 2:
    cout << "输入读者编号:";
    cin >> readerid;
    r=query(readerid);
    if (r==NULL)
    {
     cout << " 该读者不存在  "<<endl;
        break;
    }
    cout << "输入新的姓名:";
    cin >> rname;
    r->setname(rname);
     break;
            case 3:
        cout << " 输入读者编号:";
                    cin >> readerid;
     r=query(readerid);
     if (r==NULL)
     {
         cout <<" 该读者不存在" << endl;
         break;
     }
     r->delbook();
     break;
   case 4:
    cout << "读入读者编号:";
    cin >> readerid;
    r=query(readerid);
    if (r==NULL)
    {
     cout <<"该读者不存在"<< endl;
     break;
    }
    r->disp();
    break;
   case 5:
    disp();
    break;
   case 6:
    clear();
    break;
  }
 }
}

class Book//图书类
{
private:
    int tag;//删除标记 1:已删 0:未删
 int no;//图书编号
 char name[20];//书名
 int onshelf;//是否再架 1:再架 2:已借
public:
 Book(){}
 char *getname() { return name; }//获取姓名
 int getno(){ return no; }//获取图书编号
 int gettag(){ return tag; }//获取删除标记
 void setname(char na[])//设置书名
 {
  strcpy(name,na);
 }
 void delbook(){ tag=1;}//删除图书
 void addbook(int n,char *na)//增加图书
 {
  tag=0;
  no=n;
  strcpy(name,na);
  onshelf=1;
 }
 int borrowbook()//借书操作
 {
  if (onshelf==1)
  {
   onshelf=0;
   return 1;
  }
  return 0;
 }
 void retbook()//还书操作
 {
  onshelf=1;
 }
 void disp()//输出图书
 {
  cout << setw(6) << no << setw(18) << name << setw(10)
   <<(onshelf==1? "在架":"已借") <<endl;
 }
};
class BDatabase//图书库类
{
private:
    int top;         //图书记录指针
 Book book[Maxb]; //图书记录
public:
 BDatabase()//构造函数，将book.txt读到book[]中
 { 
   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()//全删
 {
  top=-1;
 }
    int addbook(int n,char *na)//增加图书
 {
  Book *p=query(n);
  if (NULL==p)
  {
   top++;
   book[top].addbook(n,na);
   return 1;
  }
  return 0;
 }
 Book *query(int bookid)//查找图书
 {
  for (int i=0;i<=top;i++)
   if (book[i].getno()==bookid &&book[i].gettag()==0)
   { 
    return &book[i];
   }
   return NULL;
 }
 void bookdata();//图书库维护
 void disp()
 {
   for (int i=0;i<=top;i++)
    if (book[i].gettag()==0)
     book[i].disp();
 }
 ~BDatabase()//析构函数，将book[]写到book.txt文件中
 {
  fstream file("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()
{
    int choice=1;
 char bname[40];
 int bookid;
 Book *b;
 while (choice!=0)
 {
  cout <<"图书维护 1: 新增 2: 更改 3:删除 4:查找 5:显示 6:全删 0:退出=>";
  cin >> choice;
  switch (choice)
  {
            case 1:
    cout << "输入图书编号:";
    cin >> bookid;
                cout << "输入图书书名:";
    cin >> bname;
    addbook(bookid,bname);
    break;
            case 2:
    cout << "输入图书编号:";
    cin >> bookid;
    b=query(bookid);
    if (b==NULL)
    {
     cout << " 该图书不存在  "<<endl;
        break;
    }
    cout << "输入新的书名:";
    cin >> bname;
    b->setname(bname);
     break;
            case 3:
        cout <<" 读入图书编号:";
                    cin >> bookid;
     b=query(bookid);
     if (b==NULL)
     {
         cout <<" 该图书不存在" << endl;
         break;
     }
     b->delbook();
     break;
   case 4:
    cout << "  读入图书编号:";
    cin >> bookid;
    b=query(bookid);
    if (b==NULL)
    {
     cout <<"  该图书不存在"<< endl;
     break;
    }
    b->disp();
    break;
   case 5:
    disp();
    break;
   case 6:
    clear();
    break;
  }
 }
}
void main()
{    
 int choice=1,bookid,readerid;
 RDatabase ReaderDB;
 Reader *r;
 BDatabase BookDB;
 Book *b;
 while(choice!=0)
 {       
            cout <<"*************************************************\n";
   cout <<"********************图书管理1.0******************\n";
   //cout <<"******************010444106  李志****************\n";
      
   cout <<"1:借书 2:还书 3:图书维护 4:读者维护 0:离开=>";
   cin >> choice;
   switch (choice)
   {
   case 1:
    cout <<"  借书 读者编号:";
    cin >>readerid;
    cout <<"  图书编号： ";
    cin >>bookid;
    r=ReaderDB.query(readerid);
    if (NULL==r)
    {
     cout <<"  不存在该读者，不能借书"<< endl;
     break;
    }
    b=BookDB.query(bookid);
    if (b==NULL)
    {
     cout <<"  不存在该图书，不能借书"<< endl;
     break;
    }
    if (b->borrowbook()==0)
    {
     cout << "  该图书已借出，不能借书"<< endl;
     break;
    }
    r->borrowbook(b->getno());
    break;
   case 2:
    cout<<"还书 读者编号:";
    cin >>readerid;
    cout << "   图书编号:";
    cin >>bookid;
    r=ReaderDB.query(readerid);
    if (r==NULL)
    {
     cout <<" 不存在该读者，不能还书" << endl;
     break;
    }
    b=BookDB.query(bookid);
    if (b==NULL)
    {
     cout <<"  不存在该图书，不能还书" <<endl;
     break;
    }
    b->retbook();
    r->retbook(b->getno());
    break;
   case 3:
     BookDB.bookdata();
     break;
   case 4:
        ReaderDB.readerdata();
        break;

   }
 }
}