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题目：键盘输入X值时,求其相应的Y值* ┌ -1 (X<0)* │* Y=├ 0 (X=0)* │* └ 1 (X>0)SET TALK OFFFOUNDACCEPT “请输入一个数：” TO XFOUNDDO WHILECASE X<0Y=-1CASE X=0Y=0FOUNDDEFAULT X>0Y=1ENDCASE? YSET TALK OFF

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