探索更好的方法:访问基类的私有成员
修改程序,我是加了两个函数,想知道有没有更好的修改方法
修改前:
#include <iostream.h>
class base
{
private:
int n1;
protected:
int k1;
public:
base(){n1=0;k1=1;}
void fun1(){cout<<n1<<k1<<endl;}
};
class d1:public base
{
private:
int n2;
protected:
int k2;
public:
d1(){n2=10;k1=11;}
void fun2(){cout<<n1<<k1<<endl; cout<<n2<<k2<<endl;}//
};
class d2:public d1
{
private:
int n3;
protected:
int k3;
public:
d2(){n3=20;k3=21;}
void fun3(){cout<<n1<<k1<<endl;cout<<n2<<k2<<endl; cout<<n3<<k3<<endl;}
};
void main()
{
base baseobj;
d1 d1obj;
d2 d2obj;
baseobj.fun1();
d1obj.fun2();
d2obj.fun3();
}
修改后:
#include <iostream.h>
class base
{
private:
int n1;
protected:
int k1;
public:
base(){n1=0;k1=1;}
int get_n1(){return n1;}
void fun1(){cout<<"class base:"<<endl;
cout<<"n1="<<n1<<","<<"k1="<<k1<<endl;}
};
class d1:public base
{
private:
int n2;
protected:
int k2;
public:
d1(){n2=10;k2=11;}
int get_n2(){return n2;}
void fun2(){cout<<"class d1:"<<endl;
cout<<"n1="<<base::get_n1()<<","<<"k1="<<k1<<endl;
cout<<"n2="<<n2<<","<<"k2="<<k2<<endl;}
};
class d2:public d1
{
private:
int n3;
protected:
int k3;
public:
d2(){n3=20;k3=21;}
void fun3(){cout<<"class d2:"<<endl;
cout<<"n1="<<base::get_n1()<<","<<"k1="<<k1<<endl;
cout<<"n2="<<d1::get_n2()<<","<<"k2="<<k2<<endl;
cout<<"n3="<<n3<<","<<"k3="<<k3<<endl;}
};
void main()
{
base baseobj;
d1 d1obj;
d2 d2obj;
baseobj.fun1();
d1obj.fun2();
d2obj.fun3();
}