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【单选题】
有函数关系如下,能正确表示该关系的是 。 x y x<0 x-1 x=0 x x>0 x+1
A.
y=x+1; if(x>=0) if(x= =0) y=x; else y=x-1;
B.
y=x-1; if(x!=0) if (x>0) y=x+1; else  y=x;
C.
if (x<=0) if (x<0) y=x-1; else y=x; else y=x+1;
D.
D) y=x; if(x<=0) if (x<0) y=x-1; else y=x+1;
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