library.txt

一个用VC开发的图书馆管理系统,一定有得于学习.

#include<iostream.h>
#include<iomanip.h>
#include<string.h>
#include<fstream.h>
const int Maxr=30;//最大读者数
const int Maxb=100;//书库最大存书
const int Maxbor=2;//读者最大借书2本
class Reader
{
	friend class Book;
	int tag;//读者删除标记
	int no;//读者号
	char name[20];//读者名
	int borbook[Maxbor];//所借书
public:
	char *getname() {return name;}//获取读者名
	int gettag() {return tag;}//获取删除标记
	int getno() {return no;}//获取读者号
	void setname (char na[])//设置读者名
	{
		strcpy (name,na);
	}
	void delbook() {tag=1;}//设置删除标记1
	void addreader (int n,char *na)//增增读者
	{
		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
	{
		int k=0;
		for(int i=0;i<Maxbor;i++)
		{
			if (borbook[i]==0)
			{
				borbook[i]=bookid;
				k++;
				cout<<"借书成功!"<<endl;
				break;
			}
		}
		if(k==0)cout<<"你已借够2本书,无法在借!"<<endl;
	}
	int retbook(int bookid)//还书操作
	{
		for(int i=0;i<Maxbor;i++)
		{
			if(borbook[i]=bookid)
			{
				borbook[i]=0;
				cout<<"还书成功!"<<endl;
				return 1;
			}
		}
		return 0;
	}
	void disp()//显示借书者信息
	{
		if(gettag()==0)
		{
		cout<<setw(15)<<no<<setw(15)<<name<<"借书编号:[";
		for(int i=0;i<Maxbor;i++)
			if(borbook!=0)
				cout<<borbook[i]<<"|";
			cout<<"]"<<endl;
		}
	}
};
class Book//图书类
{
	int tag;//图书删除 
	int no;//图书号
	char name[20];//书名
	int onshelf;//查找图书是否在架
public:  
	char *getname() {return name ;}//
	int getno() {return no;}//
	int gettag() {return tag;}//
	void setname(char na[])//
	{
		strcpy(name,na);
	}
	void delbook() {tag=1;}//删除图书
	void addbook(int n,char *na)// 加书操作
	{
		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()//显示图书信息
	{
		cout<<setw(6)<<"图书信息"<<setw(6)<<no<<setw(15)<<name<<setw(15)<<(onshelf==1?"在书架":"已借出")<<endl;
	}
};
class RDatabase//读者信息库
{
	int top;//读者记录指针
	Reader read[Maxr];
public:
	RDatabase()
	{
		top=-1;
		fstream file;
		file.open("reader.txt",ios::in|ios::binary);//从磁盘的reader.txt文件中读取读者信息
		while(1)
		{
			if(!file) break;
			top++;
			file.read((char *)&read[top],sizeof(read[top]));
		}
		file.close();
		top++;
	}
	int addreader(int n,char *na)//添加读者
	{
		Reader *p=query(n);
		if(p==NULL)
		{
			read[top].addreader(n,na);
			top++;
			return 1;
		}
		return 0;
	}
	Reader * query (int readerid)
	{
		for(int i=0;i<top;i++)
			if(read[i].getno()==readerid&&read[i].gettag()==0)
			{
				return &read[i];				
			}
		return NULL;
	}
	void disp()
	{
		for(int i=1;i<top;i++)
			read[i].disp();
	}
	void readerdata();
	~RDatabase()//将读者信息写入reader.txt
	{
		fstream file;
		file.open("reader.txt",ios::out|ios::binary);
		for(int i=0;i<top;i++)
				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<<"读者管理:"<<endl;
		cout<<"1:新增读者"<<endl;
		cout<<"2:更改读者名"<<endl;
		cout<<"3:删除读者"<<endl;
		cout<<"4:查找读者"<<endl;
		cout<<"5:显示所有读者"<<endl;
		cout<<"0:退出"<<endl;
		cin>>choice;
		switch(choice)
		{
		case 1:cout<<"请输入新读者的编号"<<endl;
			cin>>readerid;
			cout<<"请输入新读者的姓名:"<<endl;
			cin>>rname;
			addreader(readerid,rname);
			break;
		case 2:cout<<"请输入你的读者编号:"<<endl;
			cin>>readerid;
			r=query(readerid);
				if(r==NULL)
				{
					cout<<"对不起!您的编号有误,请核实后在再输"<<endl;
					break;
				}
				cout<<"请输入你的新姓名:"<<endl;
				cin>>rname;
				r->setname(rname);
				break;
		case 3:cout<<"!!!想删除一个读者吗?输入你想删除的读者编号:"<<endl;
			cin>>readerid;
			r=query(readerid);
			if(r==NULL)
			{
				cout<<"该读者不存在,无须删除,请核实后再操作"<<endl;
				break;
			}
			r->delbook();
			break;
		case 4:cout<<"请输入你想查找的读者编号:";
			cin>>readerid;
			r=query(readerid);
			if(r==NULL)
			{
				cout<<"该读者不存在,无法取得相关信息:";
				break;
			}
			r->disp();
			break;
		case 5:
			disp();
			break;
		}
	}
}
class BDatabase//图书库管理类
{
	int top;
	Book book[Maxb];
public:
	BDatabase()//构造函数
	{
		top=-1;
		fstream file;
		file.open("book.txt",ios::in|ios::binary);
			while(1)
			{
				if(!file) break;
				top++;
				file.read((char*)&book[top],sizeof(book[top]));
			}
		file.close();
		top++;
	}
	int addbook(int n,char *na)// 添加图书,加前先查找
	{
		Book *p=query(n);
		if (p==NULL)
		{
			book[top].addbook(n,na);
			top++;
			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[i]写入文件
	{
		fstream file("book.txt",ios::out|ios::binary);
		for (int i=0;i<top;i++)
				file.write((char *)&book[i],sizeof(book[i]));
			file.close();
	}
};
void BDatabase::bookdata()//函数说明
{
	int choice=1;
	char bname[40];
	int bookid;
	Book *b;
	while (choice!=0)
	{
		cout<<"图书管理:"<<endl;
		cout<<"1:新增图书"<<endl;
		cout<<"2:更改图书名"<<endl;
		cout<<"3:删除图书"<<endl;
		cout<<"4:查找图书"<<endl;
		cout<<"5:显示所有图书"<<endl;
		cout<<"0:退出"<<endl;
		cin>>choice;
		switch(choice)
		{
		case 1:
			cout<<"输入你要新加图书编号:"<<endl;
			cin>>bookid;
			cout<<"输入新的图书名:"<<endl;
				cin>>bname;
				addbook(bookid,bname);
				break;
		case 2:
			cout<<"输入原图书编号:"<<endl;
			cin>>bookid;
			b=query(bookid);
			if(b==NULL)
			{
				cout<<"该书不存在"<<endl;
				break;
			}
			cout<<"输入新的书名:"<<endl;
			cin>>bname;
			b->setname(bname);
			break;
		case 3:
			cout<<"输入图书编号:"<<endl;
			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:"<<endl;
			cin>>bookid;
			b=query(bookid);
			if(b==NULL)
			{
				cout<<"该图书不存在"<<endl;
				break;
			}
			b->disp();
			break;
		case 5:
			disp();
			break;
		}
	}
}
void main()
{
	int choice=1;
	int bookid;
	int readerid;
	RDatabase ReaderDB;
	Reader *r;
	BDatabase BookDB;
	Book *b;
	while (choice!=0)
	{
		cout<<"1:借书:"<<"\n执行读者借书的操作"<<endl;
		cout<<"2:还书:"<<"\n执行读者还书的操作"<<endl;
		cout<<"3:图书管理:"<<"\n对图书进行新增,更改,删除,查找,显示的操作"<<endl;
		cout<<"4:读者管理:"<<"\n对读者进行新增,更改,删除,查找,显示的操作"<<endl;
		cout<<"0:离开:"<<"\n退出本操作到上一层"<<endl;;
		cin>>choice;
		switch(choice)
		{
		case 1:
			cout<<"借书者编号:"<<endl;
			cin>>readerid;
			cout<<"图书编号:"<<endl;
			cin>>bookid;
	        r=ReaderDB.query(readerid);
			b=BookDB.query(bookid);
			if (r==NULL)
			{
				cout<<"读者不存在,不能借书:"<<endl;
					break;
			}
			if (b==NULL)
			{
				cout<<"不存在图书.不能借书"<<endl;
					break;
			}
			if(b->borrowbook()==0)
			{
			cout<<"图书已借出"<<endl;
			break;
			}
			r->borrowbook(b->getno());
			break;
		case 2:
			cout<<"还书者编号"<<endl;
			cin>>readerid;
			cout<<"图书编号"<<endl;
			cin>>bookid;
			r=ReaderDB.query(readerid);
			if(r==NULL)
			{
				cout<<"不存在读者,不能还书"<<endl;
				break;
			}
			b=BookDB.query(bookid);
			if(b==NULL)
			{
				cout<<"不存在图书,无法还书"<<endl;
				break;
			}
			b->retbook();
			r->retbook(b->getno());
			break;
		case 3:
			BookDB.bookdata();
			break;
		case 4:
			ReaderDB.readerdata();
			break;
		}
	}
}