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写结果classA{intm;public:A(inta=0){m=a;}virtualvoidf(){cout<f();p->g();}

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写结果。classA{public:A(){}virtualvoidfunc(){cout<<"DA";}~A(){func();}};classB:publicA{public:B(){}voidfunc(){cout<<"DB";}~B(){func();}};intmain(){B b；A &a=b；return 0；}

写结果。classB{public:B(inti){b=i+50;show()；}B(){}virtualvoidshow(){cout<<"B"<

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);}

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;}