题型:单项选择题 以下if语句书写正确的是 ( )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); 查看答案