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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;}

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