A.if(x==0.0)orif(x!=0.0) B.if(x>=0.0) C.if(x<=0.0) D.constfloatEPSINON=0.00001;if((x>=-EPSINON)&&(x<=EPSINON)
A.base->C->C2->C1 B.base->C1->C2->C C.C1->C2->base->C
A.0 B.10 C.11 D.9