有以下程序 include <iostream> using namespace std; class Base { int a; public: Base(int x)

有以下程序

include ＜iostream＞

using namespace std;

class Base

{

int a;

public:

Base(int x){ a=x; }

void show(){ cout＜＜a; }

class Derived : public Base

{

int b;

public:

Derived(int i) :Base(i+1),b(i){}

void show() { cout＜＜b;

};

int main ()

{

Base b(5),*pb;

Derived d(1);

pb=&d;

pb-＞show ();

return 0;

}

运行后的打印结果是______。