#include<iostream> using namespace std; class Base public: virtual void Show( )cout<<'B';; ,; class Derived:public Base 1 public: void Show( ) cout< <'D';- ,; int main( ) 1 Base *pl=new Derived; Derived *p2=new Derived; p1->Show0; p2->Show0; delete p1; delete p2; return 0; ｝ 运行这个程序的输出结果是_

这个程序存在语法错误，无法通过编译。具体地说，class Base的定义缺少了一个左花括号，应该修改为class Base{。同时，class Derived的定义也缺少了一个左花括号，应该修改为class Derived:public Base{。修改后的程序如下：

#include<iostream>
using namespace std;

class Base {
public:
    virtual void Show() { 
        cout << 'B'; 
    }
};

class Derived:public Base {
public:
    void Show() { 
        cout << 'D'; 
    }
};

int main() {
    Base *p1 = new Derived;
    Derived *p2 = new Derived;
    p1->Show();
    p2->Show();
    delete p1;
    delete p2;
    return 0;
}

运行这个程序的输出结果是：

D
D