单项选择题

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