这个代码有逻辑错误，修改下

Question

题目是：
输入三个点坐标
若该三点能构成三角形则输出周长和面积，否则输出Impossible;
现在只能输出Impossible。

#include <stdio.h>
int main()
{
   double a,b,c,d,e,f,g,h,i,k;
   scanf("%lf,%lf\n",&a,&b);
   scanf("%lf,%lf\n",&c,&d);
   scanf("%lf,%lf\n",&e,&f);
   g=sqrt((a-c)*(a-c)-(b-d)*(b-d));
   h=sqrt((c-e)*(c-e)-(d-f)*(d-f));
   i=sqrt((a-e)*(a-e)-(b-f)*(b-f));
   if(g+h<i&&g+i<h&&i+h<g){
       k=(g+h+i)/2;
       printf("primer=%.2f,area=%.2f",g+h+i,sqrt(k*(k-g)*(k-h)*(k-i)));
   }else{
       printf("Impossible");
   }
   return 0;
}

Answer 1

计算两点间距离有误，应该是相加，不是相减

g=sqrt((a-c)*(a-c)+(b-d)*(b-d));
   h=sqrt((c-e)*(c-e)+(d-f)*(d-f));
   i=sqrt((a-e)*(a-e)+(b-f)*(b-f));