题目：键盘输入X值时,求其相应的Y值P74* ┌ -1 (X<0)* │* Y=├ 0 (X=0)* │* └ 1 (X>0)SET TALK OFF**********FOUND**********ACCEPT “请输入一个数：” TO X**********FOUND**********DO WHILECASE X<0Y=-1CASE X=0Y=0**********FOUND**********DEFAULT X>0Y=1ENDCASE? YSET TALK OFF