第13周-程序阅读（3）

#include <iostream>
using namespace std;
class Base
{
public:
virtual void Who() =0;
};
class FirstDerived:public Base
{
public:
void Who() { cout<<"F"; }
};
class SecondDerived:public Base
{
public:
void Who() { cout<<"S"; }
};
int main()
{
FirstDerived first_obj;
SecondDerived second_obj;
Base &bref=first_obj;
bref.Who();
bref=second_obj;
bref.Who();
Base *bp;
bp=&first_obj;
bp->Who();
bp=&second_obj;
bp->Who();
return 0;
}

FFFS
Process returned 0 (0x0)   execution time : 0.016 s
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