c++图书管理系统的代码问题啊啊啊

为什么增加借阅者信息之后安回车自己就退了。还有，程序哪里有问题，谢谢

链接打不开，建议把代码贴上来，帮你看看

#include
using namespace std;
#include
#include
#include

const int Maxr=300;

const int Maxb=300;

const int Maxbor=10;

class Reader
{
private:
int tag;
int No;
char name[20];
int borbook[Maxbor];
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=n;
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(10) << No <<setw(15) << name<<"借书检索号：[";
for(int i=0;i<Maxbor;i++)
if(borbook[i]!=0)
cout << borbook[i] << "|";
cout << "]"<<endl;
}
};
class RDatabase
{
private:
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()
{
char choice;
char rname[20];
int readerid;
Reader *r;

cout <<"\n\n\t\t\t借阅者信息\n\n\n\t\t 1 增加借阅者信息\n\n\t\t 2 修改借阅者信息\n\n\t\t 3 删除借阅者信息\n\n\t\t 4 查询借阅者信息\n\n\t\t 0 退出"< cin >> choice;
switch (choice)
{
case '1':
cout << "输入借阅者学号:";
cin >> readerid;
cin >> rname;
addreader (readerid,rname);
break;
case '2':
cout << "输入借阅者学号:";
cin >> readerid;
r=query(readerid);
if (r==NULL)
cout << " 借阅者信息错误"<<endl;
break;

cout << "重新输入姓名:"; cin >> rname;
r->setname(rname);
break;
case '3':
cout << " 输入借阅者学号:";
cin >> readerid; r=query(readerid);
if (r==NULL)
cout <<" 借阅者信息错误" << endl;
break;
r->delbook();
break;
case '4':
cout << "输入借阅者学号:";
cin >> readerid;
r=query(readerid);
if (r==NULL)
{
cout <<"学号信息错误"<< endl;
} r->disp();
break;
break;
case '5':
disp();
break;

default:cout<<"信息错误，请重新输入：";
break;
}
}

class Book
{
private:
float price;
char author[10];
int tag;
int No;
char place[40];
char name[20];
int onshelf;
public:
Book(){}
char *getname() { return name; }
int getNo(){ return No; }
char *getplace(){ return place;}
int gettag(){ return tag; }
char*getauthor(){return author;}
char getprice(){return price;}
void setname(char na[])
{
strcpy(name,na);
}
void setauthor(char au[])
{
strcpy(author,au);}
void delbook(){ tag=1;}
void addbook(int N,char *na,char*au,int pr,char *bp)
{
tag=0;
No=N;
price=pr;
strcpy(author,au);
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)<< "检索号: " << No << setw(18) <<"书名: "<< name << setw(10) <<"作者: "<<author<<setw(18)<<"单价: "<<price<<setw(10) <<(onshelf==1? "有现存":"已借完") <<endl;
}
};

class BDatabase
{

private:
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,char*au,int pr,char *bp)
{
Book *p=query(n);
if (NULL==p)
{
top++;
book[top].addbook(n,na,au,pr,bp);
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()
{
char choice;
char bauthor[10];
int bprice;
char bname[40];
int bookid;
char bplace[40];
Book *b;

cout <<"\n\n\n\t\t\t图书信息"< cin >> choice;
switch (choice)
{
case '1':
cout << "输入图书检索号:"< cin >> bookid;
cout << "输入图书书名:"< cin >> bname;
cout<<" 输入作者名:";
cin>>bauthor;
cout << "输入图书价格:"< cin >> bprice;
cout << "输入图书出版社:"< cin >> bplace;
addbook(bookid,bname,bauthor,bprice,bplace);
break;
case '2':
cout << "输入图书检索号:"< cin >> bookid;
b=query(bookid);
if (b==NULL)
{
cout << " 信息错误"< break;
}
cout cin >> bname;
b->setname(bname);
break;
case '3':
cout <<" 读入图书检索号:"< cin >> bookid;
b=query(bookid);
if (b==NULL)
{
cout <<" 信息错误" << endl;
break;
}
b->delbook();
break;
case '4':
cout << " 读入图书检索号:"< cin >> bookid;
b=query(bookid);
if (b==NULL)
{
cout <<" 信息错误"<< endl;
break;
}
b->disp();
break;

default:cout<<"信息错误，请重新输入:";
}
}

void main()
{
char choice;
int bookid,readerid;
RDatabase ReaderDB;
Reader *r;
BDatabase BookDB;
Book *b;

cout <<endl<<endl<<"\t\t\t 图书管理系统\n\n\n";

cout <<"\t\t\t1 借还情况\n\n\t\t\t2 图书信息表\n\n\t\t\t3 借阅者信息表\n\n\t\t\t0 退出"< cin >> choice;
switch (choice)
{
case '1':
cout <<"\t\t\t1 借书\n\n\t\t\t2 还书\n\n\t\t\t0 退出"< cin>>choice;
switch(choice)
{

case '1':
cout <<" 借阅者学号:";
cin >>readerid;
cout <<" 图书检索号：";
cin >>bookid;
r=ReaderDB.query(readerid);
if (NULL==r)
{
cout <<" 借阅者信息错误，不能借书"<< endl;
break;
}
b=BookDB.query(bookid);
if (b==NULL)
{

cout<<"图书信息错误，不能借书"<<endl;
break;

}
if(b->borrowbook()==0)
{
cout<<"该图书没有现存，不能借书"< break;
}
r->borrowbook(b->getNo());
break;
case '2':
cout<<"借阅者学号:";
cin>>readerid;
cout<<"图书检索号：";
cin>>bookid;
r=ReaderDB.query(readerid);
if(r==NULL)
{
cout<<"借阅者信息错误，不能还书"< break;
}
b=BookDB.query(bookid);
if(b==NULL)
{
cout break;
}
b->retbook();
r->retbook(b->getNo());
break;
}

case '2':
BookDB.bookdata();
break;
case '3':
ReaderDB.readerdata();
break;
default:cout<<"信息错误，请从新输入：";
}
}

 #include <iostream> 
using namespace std;
#include <string> 
#include <fstream>
#include <iomanip>  


const int Maxr=300; 

const int Maxb=300; 

const int Maxbor=10;








class Reader 
{ 
private: 
int tag; 
int No; 
char name[20]; 
int borbook[Maxbor]; 
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=n; 
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(10) << No <<setw(15) << name<<"借书检索号：[";
for(int i=0;i<Maxbor;i++) 
if(borbook[i]!=0) 
cout << borbook[i] << "|"; 
cout << "]"<<endl; 
} 
}; 
class RDatabase 
{ 
private: 
    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() 
{ 
char choice; 
char rname[20]; 
int readerid; 
Reader *r; 




cout <<"\n\n\t\t\t借阅者信息\n\n\n\t\t 1 增加借阅者信息\n\n\t\t 2 修改借阅者信息\n\n\t\t 3 删除借阅者信息\n\n\t\t 4 查询借阅者信息\n\n\t\t 0 退出"<<endl; 
cin >> choice; 
switch (choice) 
{ 
case '1': 
cout << "输入借阅者学号:"; 
cin >> readerid; 
cin >> rname; 
addreader (readerid,rname); 
break; 
case '2': 
cout << "输入借阅者学号:"; 
cin >> readerid; 
 r=query(readerid); 
if (r==NULL) 
cout << " 借阅者信息错误"<<endl; 
break; 

cout << "重新输入姓名:"; cin >> rname;
r->setname(rname); 
break; 
case '3': 
    cout << " 输入借阅者学号:"; 
cin >> readerid; r=query(readerid); 
if (r==NULL) 
cout <<" 借阅者信息错误" << endl; 
break; 
r->delbook(); 
break;
case '4': 
cout << "输入借阅者学号:"; 
cin >> readerid; 
r=query(readerid); 
if (r==NULL) 
{ 
cout <<"学号信息错误"<< endl; 
} r->disp(); 
break; 
break; 
case '5': 
disp(); 
break; 

default:cout<<"信息错误，请重新输入：";
    break; 
} 
} 

class Book 
{ 
private: 
float price; 
char author[10]; 
int tag; 
int No; 
char place[40];
char name[20]; 
int onshelf; 
public: 
Book(){} 
char *getname() { return name; } 
int getNo(){ return No; } 
char *getplace(){ return place;}
int gettag(){ return tag; } 
char*getauthor(){return author;} 
char getprice(){return price;} 
void setname(char na[]) 
{ 
strcpy(name,na); 
} 
void setauthor(char au[]) 
{ 
strcpy(author,au);} 
void delbook(){ tag=1;} 
void addbook(int N,char *na,char*au,int pr,char *bp)
{ 
tag=0; 
No=N; 
price=pr; 
strcpy(author,au); 
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)<< "检索号: " << No << setw(18) <<"书名: "<< name << setw(10) <<"作者: "<<author<<setw(18)<<"单价: "<<price<<setw(10) <<(onshelf==1? "有现存":"已借完") <<endl; 
} 
};  
class BDatabase 
{ 

private: 
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,char*au,int pr,char *bp) 
{ 
Book *p=query(n); 
if (NULL==p) 
{ 
top++; 
book[top].addbook(n,na,au,pr,bp); 
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() 
{ 
char choice; 
char bauthor[10];
int bprice; 
char bname[40]; 
int bookid; 
char bplace[40];
Book *b; 



cout <<"\n\n\n\t\t\t图书信息"<<endl<<endl; cout<<"\t\t1 增加图书信息\n \t\t2 修改图书信息\n\t\t3 删除图书信息\n\t\t4 查询图书信息\n\t\t0 退出"<<endl; 
cin >> choice; 
switch (choice) 
{ 
case '1': 
cout << "输入图书检索号:"<<endl; 
cin >> bookid; 
cout << "输入图书书名:"<<endl; 
cin >> bname; 
cout<<" 输入作者名:"; 
cin>>bauthor;
cout << "输入图书价格:"<<endl; 
cin >> bprice; 
cout << "输入图书出版社:"<<endl; 
cin >> bplace; 
addbook(bookid,bname,bauthor,bprice,bplace); 
break;
case '2': 
cout << "输入图书检索号:"<<endl; 
cin >> bookid; 
b=query(bookid); 
if (b==NULL) 
{ 
cout << " 信息错误"<<endl; 
break; 
} 
cout << "重新输入书名:"<<endl; 
cin >> bname; 
b->setname(bname); 
break; 
case '3': 
cout <<" 读入图书检索号:"<<endl; 
cin >> bookid; 
b=query(bookid); 
if (b==NULL) 
{ 
cout <<" 信息错误" << endl; 
break; 
} 
b->delbook(); 
break; 
case '4': 
cout << " 读入图书检索号:"<<endl; 
cin >> bookid; 
b=query(bookid); 
if (b==NULL) 
{ 
cout <<" 信息错误"<< endl; 
break; 
} 
b->disp(); 
break; 

default:cout<<"信息错误，请重新输入:"; 
} 
} 

void main()
{ 
char choice; 
int bookid,readerid; 
RDatabase ReaderDB; 
Reader *r; 
BDatabase BookDB; 
Book *b; 



cout <<endl<<endl<<"\t\t\t 图书管理系统\n\n\n"; 

cout <<"\t\t\t1 借还情况\n\n\t\t\t2 图书信息表\n\n\t\t\t3 借阅者信息表\n\n\t\t\t0 退出"<<endl; 
cin >> choice; 
switch (choice) 
{ 
case '1': 
cout <<"\t\t\t1 借书\n\n\t\t\t2 还书\n\n\t\t\t0 退出"<<endl;
cin>>choice;
switch(choice)
{

case '1':
cout <<" 借阅者学号:"; 
cin >>readerid; 
cout <<" 图书检索号："; 
cin >>bookid; 
r=ReaderDB.query(readerid); 
if (NULL==r) 
{ 
cout <<" 借阅者信息错误，不能借书"<< endl; 
break; 
} 
b=BookDB.query(bookid); 
if (b==NULL) 
{ 

    cout<<"图书信息错误，不能借书"<<endl;
    break;
}
if(b->borrowbook()==0)
{
    cout<<"该图书没有现存，不能借书"<<endl;
    break;
}
r->borrowbook(b->getNo());
break;
case '2':
    cout<<"借阅者学号:";
    cin>>readerid;
    cout<<"图书检索号：";
    cin>>bookid;
    r=ReaderDB.query(readerid);
    if(r==NULL)
    {
        cout<<"借阅者信息错误，不能还书"<<endl;
        break;
    }
    b=BookDB.query(bookid);
    if(b==NULL)
    {
        cout<<"图书信息错误，不能还书"<<endl;
        break;
    }
    b->retbook();
    r->retbook(b->getNo());
    break;
}



case '2':
    BookDB.bookdata();
break; 
case '3': 
ReaderDB.readerdata(); 
break; 
default:cout<<"信息错误，请从新输入："; 
} 
}

自己不能断点单步调试一下？

http://ask.csdn.net/questions/161501
和那个问题是一个问题么？

如果不是，请指出。否则我的回答集中在那里。

那我在此不再重复回答。

看看为什么增加借阅者信息之后安回车自己就退了。还有，程序哪里有问题我不会了