#include <iostream>
using namespace std;
class cCurrency
{
public:
    cCurrency(float fAmerican,float fEurope);
    virtual void Print_Exchange(){}
    void set();
protected:
    float fAmerican;
    float fEurope;
};

cCurrency::cCurrency(float fAmerican,float fEurope)
{
    this->fAmerican=fAmerican;
    this->fEurope=fEurope;
}

class cAmerican:public cCurrency
{
public:
    void Print_Exchange();
private:
    float RMB;
};
class cEurope:public cCurrency
{
public:
    void Print_Exchange();
private:
    float RMB;
};
void cAmerican::Print_Exchange()
{
    this->RMB=100*fAmerican;
    cout<<this->RMB<<endl;
}

void cEurope::Print_Exchange()
{
    this->RMB=100*fEurope;
    cout<<this->RMB<<endl;
}

void cCurrency::set()
{
    this->fAmerican=(float)6.3492;
    this->fEurope=(float)7.9365;
}

int main()
{
    cCurrency *pCurrency=new cCurrency(2,3);
    cAmerican A1;
    cEurope A2;
    pCurrency=&A1;
    pCurrency->set();
    pCurrency->Print_Exchange();
    pCurrency=&A2;
    pCurrency->set();
    pCurrency->Print_Exchange();
    system("pause");
    return 0;
}

你有本事,你改