chapter 7

#include <iostream>
#include <string>
#include <cctype>
using namespace std;

int main()
{
  string subject;
  char grade;
  double gradePoint;
  ofstream fout;
  while(true)
  {
    cout << "What is the subject? ";
    getline(cin,subject);
    cout << "What is your grade [A-F]? ";
    cin >> grade;
    cin.ignore(1000,10);
    if (toupper(grade) == 'A')
    {
      gradePoint = 4.0;
    }
    else
    {
      if (toupper(grade) == 'B')
      {
        gradePoint = 3.0;
      }
      else
      {
        if (toupper(grade) == 'C')
        {
          gradePoint = 2.0;
        }
        else
        {
          if (grade == 'D' || grade == 'd')
          {
            gradePoint = 1.0;
          }
          else
          {
            gradePoint = 0;
            break;
          }
        }
      }
    } // A !A
    cout << "your grade point is " << gradePoint << endl;
    fout.open("gradePointList.txt", ios::app);
//    if(!fout.good()){ throw "I/O Error";}
    if(!fout.good()) throw "I/O Error";
    fout << gradePoint << endl;
    fout.close();
   
  } // while
  return 0;
}