void GradeInfo::PrintBarGraph()
{
    int k,index;
    char ch;

    for(ch = 'A'; ch <= 'D'; ch++)
    {
        index = CharToIndex(ch);

        for(k=0; k < myGrades[index]; k++)
        {
            cout << ch;
        }
        cout << endl;
    }

    cout << "Total Grades = " << myCount << endl;
}