摘要：
#include <iostream>using namespace std;class action{public: action(){} ~action(){} void forward(){cout<<"forward"<<endl;} void backward(){cout<<"backward"<<endl;}};class command{public: command(){} virtual ~command(){} virtual void execute()=0; virtu 阅读全文
摘要：
#include <iostream>#include <vector>using namespace std;class relatives{public: relatives(){} virtual ~relatives(){} virtual bool request(int)=0;};class brother : public relatives{public: brother(){} virtual ~brother(){} bool request(int num) { if (num<100) { ... 阅读全文