#include<iostream>
#include<string>
using namespace std;
string mark[2]={"is not","is"};
class Brand
{public:
string name;
int year;
public:
Brand(string s,int n)
{name=s;year=n;
cout<<"class Brand is created"<<endl;}
~Brand(){cout<<"class Brand is destroyed"<<endl;}
};
class writeTool
{
（ 1 ）
bool isHard;
public:
writeTool(bool iH)
{isHard=iH;
cout<<"class writeTool is created"<<endl;}
~writeTool(){cout<<"class writeTool is destroyed"<<endl;}
};
class Pen:（ 2 ）
{Brand brand;
int colorcode;
public:
Pen ( 3 ):writeTool(iH),brand(ss,yy)
{colorcode=cc;
cout<<"class pen is created"<<endl;}
void show()
{
cout<<"colorcode:"<<colorcode<<endl;
cout<<"This writing tool"<<mark[isHard]<<"hard for thin papers."endl;
cout<<"The brand"<<brand.name<<"has exist for"<<hrand.year <<"year"<<endl;}
~Pen(){cout<<"class pen is destroyed"<<endl;}
};
int main()
{Pen pen(10,true,"handsome",1950);
( 4 );
return 0;}
1 public:
2 public Brand
3 int cc, bool iH, string ss, int yy
4 pen.show();
1 public :
2 public writeTool , public Brand
3 int cc ,bool iH,string ss, int yy
4 pen.show();