第十三周 阅读程序（2）

#include <iostream>
using namespace std;
class BASE
{
private:
char c;
public:
BASE(char n):c(n) {}
virtual ~BASE() { cout<<c; }
};
class DERIVED:public BASE
{
private:
char c;
public:
DERIVED(char n):BASE(n+1),c(n) {}
~DERIVED(){ cout<<c; }
};
int main(){
DERIVED d('X');
return 0;
}