void addreader(int n,char *na) //增加读者
{
}
tag=0;
no=n;
strcpy(name,na);
for (int i=0;i
};
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"<>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"<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"<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;} //获得书名
int getno() {return no;} //获得书编号
int gettag() {return tag;} //获得删除标记
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<
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()
{