exam5.cpp
来自「C++语言程序设计题典」· C++ 代码 · 共 412 行
CPP
412 行
#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; //每位读者最多值5本书
class Reader //读者类
{
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() //输出读者信息
{
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 //读者库类
{
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[]写入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 << " 输入读者编号:";
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
{
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; //是否在架 1:在架 0: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
{
int top; //图书记录指针
Book book[Maxb]; //图书记录
public:
BDatabase() //构造函数,从book.txt->book[]
{
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 (p==NULL)
{
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,book[]->book.txt
{
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 << " 输入图书编号:";
cin >> bookid;
b=query(bookid);
if (b==NULL)
{
cout << " 该图书不存在" << endl;
break;
}
b->delbook();
break;
case 4:
cout << " 输入图书编号:";
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 << "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 (r==NULL)
{
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;
}
}
}
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