شو الخطا في هالكوود؟

#include <iostream>

#include <iomanip>

using namespace std;

int main(void)

{

    int grade, total=0, count =0;

     double average;

   do

    {          cout<<"Please enter your grades one at a time (enter 0 to quit):";

          cin>>grade;

        total = total + grade;

      count++;

   {   while (grade !=0);

     average = total/count;

    cout<<"Your average is "<<average<<".";

     return 0;

}