#include "stdio.h"class parent {public:	parent() { index_ = 999;}protected:	int index_;};class son : public parent {public:	son() { index_ = 303;}	int get_index() {		return index_;	}};int main() {//	son *son_;//	printf("The index_ of son pointer is %d\n", son_->get_index());	son *son_entity = new son();	printf("The index_ of son entity is %d\n", son_entity->get_index());	return 0;}