反弹问题

<span style="font-size:32px;">#include<stdio.h>int main()  {      int i;      int h=100;      double hi=0.0;      double ht=h/2;      double sum=0.0;      for(i=1;i<=9;i++)      {          sum=sum+2*ht;          ht=ht/2;                }      printf("sum+100=%f,  ht=%f\n",sum,ht);      return 0;  }</span>