c继承经典例子.docVIP

c++继承经典例子 #include iostream.hclass Base{private:? ? ? ? int b_number;public:? ? ? ? Base( ){}? ? ? ? Base(int i) : b_number (i) { }? ? ? ? int get_number( ) {return b_number;}? ? ? ? void print( ) {cout b_number endl;}? ? ? ? };class Derived : public Base{private:? ? ? ? int d_number;public:// constructor, initializer used to initialize the base part of a Derived object.? ? ? ? Derived( int i, int j ) : Base(i), d_number(j) { };? ? ? ? ? ? ? ? // a new member function that overrides the print( ) function in Base? ? ? ? void print( ) ? ? ? ? {? ? ? ? ? ? ? ? cout get_number( ) ;? ? ? ? ? ? ? ? ? ? ? ? // access number through get_number( )? ? ? ? ? ? ? ? cout d_number endl;? ? ? ? }};int main( ){? ? ? ? Base a(2);? ? ? ? Derived b(3, 4);? ? ? ? cout a is ;? ? ? ? a.print( );? ? ? ? ? ? ? ? // print( ) in Base? ? ? ? cout b is ;? ? ? ? b.print( );? ? ? ? ? ? ? ? // print( ) in Derived? ? ? ? cout base part of b is ; ? ? ? ? b.Base::print( );? ? ? ? ? ? ? ? // print( ) in Base? ? ? ? return 0;  sdb 新手上路UID 1050精华 0积分 0帖子 25阅读权限 10注册 2007-4-2状态 离线 #2 使用道具?? 发表于 2007-7-11 14:16? 资料? 个人空间? 短消息? 加为好友? 没有虚析构函数，继承类没有析构 //Example:??non- virtual destructors for dynamically allocated objects.#include iostream.h#include string.hclass Thing{ public:virtual void what_Am_I( ) {cout I am a Thing.\n;}~Thing(){coutThing destructorendl;}};class Animal : public Thing{??public:virtual void what_Am_I( ) {cout I am an Animal.\n;}~Animal(){coutAnimal destructorendl;}};void main( ){? ?Thing *t =new Thing;? ?? ?? ?Animal*x = new Animal;? ?Thing* array[2];? ?array[0] = t;?// base pointer? ?array[1] = x;? ? ? ? ? ? ? ?  ? for (int i=0; i2; i++)? ?array-what_Am_I( ) ;? ?delete array[0];? ?delete array[1];? ?return ;}  sdb 新手上路UID 1050精华 0积分 0帖子 25阅读权限 10注册 2007-4-2状态 离线 #3 使用道具?? 发表于 2007-7-11 14:20? 资料? 个人空间? 短消息? 加为好友? 纯虚函数，多态 #include iostream.h#include math