it can help you use C++ program we

				// a.h，类A、B和C的定义及实现
				#include 
				using namespace std;
				
				class A
				{
				public:
					void Display() {
						cout 					}
				};
				
				class B : public A
				{
				public: 
					void Display() {   //重载基类A的Display( )函数
						cout 					}
				};
				
				class C : public A
				{
				public:
					void Display() {   //重载基类A的Display( )函数
						cout 					}
				};