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写结果。classBase{public:Base(){}virtualBaseafn(){cout<<"B";returnthis;}};classSubclass:publicBase{public:Subclass(){}virtualBaseafn(){cout<<"S";returnthis；}};voidtest(Base&x){Base*b;b=x.afn()；}int main(){Basebc；Subclasssc;test(bc);test(sc);}

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写结果。classpoint{public:point(inti=0,intj=0){x0=i;y0=j;}virtualvoidset()=0；virtualvoiddraw()=0;protected:intx0,y0;};classline:publicpoint{public:line(inti=0,intj=0,intm=0,intn=0):point(i,j){x1=m;y1=n;}voidset(){cout<<"LS";}voiddraw(){cout<<"LD";}protected:intx1,y1;};classellipse:publicpoint{public:ellipse(inti=0,intj=0,intp=0,intq=0):point(i,j){x2=p;y2=q;}voidset(){cout<<"ES"；}voiddraw(){cout<<“ED”;}protected:intx2,y2;};voiddrawobj(pointp){p->draw()；}voidsetobj(pointp){p->set()；}intmain(){linelineobj=newline;ellipseelliobj=newellipse;drawobj(lineobj);drawobj(elliobj);setobj(lineobj);setobj(elliobj);deletelineobj;deleteelliobj;}

转移到ch7综合。写结果。classA{intx,y;public:A(inta,intb){x=a;y=b;}voidDisplay(){cout<

写结果。classvehicle{intMaxSpeed;intWeight;public:vehicle(){MaxSpeed=0;Weight=0;}virtual~vehicle(){Stop();}virtualvoidStop(){cout<<"VS";}};classbicycle:virtualpublicvehicle{intHeight;public:~bicycle(){Stop();}voidStop(){cout<<"BS";}};classmotorcar:virtualpublicvehicle{intSeatNum;public:~motorcar(){Stop();}voidStop(){cout<<"MAS";}};classmotorcycle:publicbicycle,publicmotorcar{public:~motorcycle(){Stop();}voidStop(){cout<<"MYS";}};intmain(){vehicle*ptr;motorcycled;ptr=&d;ptr->Stop();}

写结果。classA{public:virtualvoidPrint()=0；}；classA1:publicA{public:voidPrint(){cout<<"A1P";} };classB1:publicA{public:voidPrint(){cout<<"B1P";} };voidfun(Ap){p->Print()；}intmain(){Aptr;A1a1;B1b1;ptr=&a1；fun(ptr);ptr=&b1；fun(ptr);return 0；}