单项选择题

与y=(x＞01:x＜0-1:0)：的功能相同的if语句是 ( )
A) if(x＞0)y=1;
else if(x＜0)y=-1;
else y=0;
else y=0;
B) if(x)
if(x＞0)y=1;
else if(x＜0)y=-1;
C) y=-1;
if(x)
if(x＞0)y=1;
else if(x==0)y=0;
else y=-1;
D) y=0;
if(x＞=0)
if(x＞0)y=1;
else y=-1;