A.if(a)printf("%d\n",x);elseprintf("%d\n",y);
B.if(a==0)printf("%d\n",y);elseprintf("%d\n",x);
C.if(a!=0)printf("%d\n",x)elseprintf("%d\n",y);
D.if(a==0)printf("%d\n",x)elseprintf("%d\n",y);