练习44

#include <iostream>
using namespace std;


class BaseClass
{
public:
    void fn1();
void fn2();
};
void BaseClass::fn1()
{
    cout << "调用基类的函数fn1()" << endl;
}
void BaseClass::fn2()
{
    cout << "调用基类的函数fn2()" << endl;
}




class DerivedClass : public BaseClass
{
public:
    void fn1();
    void fn2();
};
void DerivedClass::fn1()
{
    cout << "调用派生类的函数fn1()" << endl;
}


void DerivedClass::fn2()
{
    cout << "调用派生类的函数fn2()" << endl;
}


int main()
{
    DerivedClass aDerivedClass;
    DerivedClass *pDerivedClass = &aDerivedClass;
    BaseClass    *pBaseClass    = &aDerivedClass;
    
    aDerivedClass.fn1();
    aDerivedClass.fn2();
pBaseClass->fn1();
    pBaseClass->fn2();
    pDerivedClass->fn1();
    pDerivedClass->fn2();
return 0;
}