#include<math.h>
int main(){
float x,y;
printf("请输入一个数：");
scanf（“%f”,&x);
if(x<0)y=x*x;
else if(x>0)
y=sinx;
else y=1-2*x;
printf("%f",y);
return 0;
}本回答被提问者和网友采纳
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