82虚函数 (++ C+十 4+十 ++ 例2:用多态性解决例1中的问题 #include<iostream. h> class base public virtual void print(){cout<“base”;}};∥定义了虚函数 P的/n、 public base{/定义派生类 class first void print(){cout<<“frst”;}};∥重新定义 print(() class second: public base{/定义派生类 public void print(){cout<<" second";}};∥重新定义 print()§8.2 虚函数 例2：用多态性解决例1中的问题 #include<iostream.h> class base { public: virtual void print( ) { cout << “base ”; } }; //定义了虚函数 class first:public base { //定义派生类 public: void print( ) { cout << “ first ”; } }; //重新定义print( ) class second:public base { //定义派生类 public: void print( ) { cout << " second "; } }; //重新定义print( )