#include <stdio.h>double fnFun(double x);double fnFun(double x){double i;if(x>1)i=x*x+1;else if(x<=1&&x>=-1)i=x*x;elsei=x*x-1;return (i);}void main(){double x;printf("請輸入x的值\n");scanf("%f",&x);printf("%.2f\n",fnFun(x);}