A. 对 B. 错
A. if(a) printf("%d\n",x); else printf("%d\n",y); B. if(a==0) printf("%d\n",x); else printf("%d\n",y); 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);
A) if (c B) if (a<3) x=3;else if (a<2) x=2;else x=1; C. if (a<3) x=3; if (a<2) x=2; if (a<1) x=1; D) if (a