题目内容

能够完成如下函数计算的程序段是_( )___. ┌ -1 x<0 y= ┤ 0 x=0 └ 1 x>0

A. y=1;
B. if (x>=0) if(x!=0) if(x>0) y=1; if(x>0) y=1; else y=0; else y=0; else y=-1;
C. y=0;
D. y=-1; if (x>=0) if (x>0) y=1; if (x>0) y=1; else y=0; else y=-1;

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