A.if(x=0;) printf("%f",x); elseprintf("%f",-x);
B.if(x>0) {x=x+1;printf("%f",x);} else printf("%f",-x);
C.if(x>0); {x=x+1;printf("%f",x);} else printf("%f",-x);
D.if(x>0) {x=x+1;printf("%f",x)} else printf("%f",-x);