c++继承与派生实验报告

第七章继承与派生实验目的学习声明和使用类的继承关系，声明派生类熟悉不同继承方式下对基类的访问控制学习使用虚基类解决二义性问题实验内容7．1#includeiostreamusingnamespacestd;classanimal{public:private:intage;};classdog:publicanimal{public:voidsetage(intn);private:};voiddog::setage(intn){age=n;}intmain(){dogd1;d1.setage(5);return0;}无法访问age，因为公有继承的继承规则是基类的私有类不可访问、#includeiostreamusingnamespacestd;classanimal{public:intage;private:};classdog:publicanimal{public:voidsetage(intn);private:};voiddog::setage(intn){age=n;}intmain(){dogd1;d1.setage(5);return0;}把age移到private里即可7.2#includeiostreamusingnamespacestd;classbaseclass{public:baseclass(intn){number=n;cout调用了基类的构造函数endl;}~baseclass(){cout调用了基类的析构函数endl;}private:intnumber;};classderivedclass:publicbaseclass{public:derivedclass(intn):baseclass(n){cout调用了派生类的构造函数endl;}~derivedclass(){cout调用了派生类的析构函数endl;}private:};intmain(){derivedclassd(3);return0;}7.3#includeiostreamusingnamespacestd;classvehicle{public:voidrun();voidstop();vehicle(intm,intw){maxspeed=m;weight=w;}private:intmaxspeed;intweight;};voidvehicle::run(){coutitisrunningendl;}voidvehicle::stop(){coutstopendl;}classbicycle:publicvehicle{public:bicycle(intm,intw,inth):vehicle(m,w){height=h;}private:intheight;};classmotorcar:publicvehicle{public:motorcar(intm,intw,ints):vehicle(m,w){seatnum=s;}private:intseatnum;};classmotorcycle:publicbicycle,publicmotorcar{public:motorcycle(intm,intw,inth,ints):vehicle(m,w),bicycle(m,w,h),motorcar(m,w,s){}};intmain(){motorcyclecat(1,2,3,4);cat.run();cat.stop();return0;}不设虚基类报错指代不明是哪一层函数#includeiostreamusingnamespacestd;classvehicle{public:voidrun();voidstop();vehicle(intm,intw){maxspeed=m;weight=w;}private:intmaxspeed;intweight;};voidvehicle::run(){coutitisrunningendl;}voidvehicle::stop(){coutstopendl;}classbicycle:virtualpublicvehicle{public:bicycle(intm,intw,inth):vehicle(m,w){height=h;}private:intheight;};classmotorcar:virtualpublicvehicle{public:motorcar(intm,intw,ints):vehicle(m,w){seatnum=s;}private:intseatnum;};classmotorcycle:publicbicycle,publicmotorcar{public:motorcycle(intm,intw,inth,ints):vehicle(m,w),bicycle(m,w,h),motorcar(m,w,s){}};intmain(){motorcyclecat(1,2,3,4);cat.run();cat.stop();return0;}