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C语言相关程序

#include<iostream.h>
#include<iomanip.h>
#include<string.h>
#include<fstream.h>
const int Maxr=100;		//最多读者数
const int Maxb=100;		//最多图书数
const int Maxbor=5;		//每位读者最多借五本书


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];//所借读书
public:
	Reader()  {}
	char *getname()  {return name;}
	int gettag()     {return tag;}
	int getno()      {return no;}
	void setname(char na[])
	{
		strcpy(name,na);
	}

	void delbook() {tag=1;}
	void addreader(int n,char *na)
	{
		tag=0;
		no=0;
		strcpy(name,na);
		for(int i=0;i<Maxbor;i++)
			borbook[i]=0;
	}
	void borrowbook(int bookid)
	{
		for(int i=0;i<Maxbor;i++)
		{
			if(borbook[i]==0)
			{
				borbook[i]=bookid;
				return;
			}
		}
	}
int retbook(int bookid)
{
	for(int i=0;i<Maxbor;i++)
	{
		if(borbook[i]==bookid)
		{
			borbook[i]=0;
			return 1;
		}
	}
	return 0;
}
void disp()
{
	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]<<endl;
}

};
class RDatabase
{
	int top;
	Reader read[Maxr];
public:
	RDatabase()
	{
		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()
	{
		top=-1;
	}
	int addreader(int n,char *na)
	{
		Reader *p=query(n);
		if(p==NULL)
		{
			top++;
			read[top].addreader(n,na);
			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=0;i<=top;i++)
		read[i].disp();
}
void readerdata();
~RDatabase()
{
	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<<"输入读者姓名：";
			cin>>readerid;
			r=query(readerid);
			if(r==NULL)
			{
				cout<<"该读者不存在！"<<endl;
				break;
			}
			cout<<"请输入新的姓名";
			cin>>rname;
			r->setname(rname);
			break;
		case 3:
			cout<<"请输入读者编号";
			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
{
	int tag;
	int no;
	char name[20];
	int onshelf;
public:
	Book() {}
	char *getname() {return name;}
	int getno() {return no;}
	int gettag() {return tag;}
	void setname(char na[])
	{
		strcpy(name,na);
	}

	void delbook()  {tag=1;}
	void addbook(int n,char *na)
	{
		tag=0;
		no=0;
		strcpy(name,na);
		onshelf=1;

	}
int borrowbook()
{
	if(onshelf==1)
	{
		onshelf==0;
		return 1;
	}
	return 0;
}
void retbook()
{
	onshelf=1;
}
void disp()
{
	cout<<setw(6)<<no<<setw(18)<<name<<setw(10)
		<<(onshelf==1?"在架":"已借")<<endl;
}
};
class BDatabase
{
	int top;
	Book book[Maxb];
public:
	BDatabase()
	{
		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()
{
	top=-1;
}
int addbook(int n,char *na)
{
	Book *p=query(n);
	if(p==NULL)
	{
		top++;
		book[top].addbook(n,na);
		return 1;
	}
	return 0;
}
Book *query(int bookid)
{
	for(int i=0;i<=top;i++)
		if(book[i].getno()==bookid&&book[i].gettag()==0)
			return &book[i];
		return NULL;
}
void bookdata();
void disp()
{
	for(int i=0;i<=top;i++)
		if(book[i].gettag()==0)
			book[i].disp();
}
~BDatabase()
{
	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<<"输入新的全名:";
			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，不能还书。"<<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;
		}
	}
}