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loops

natdomi (6)
how would i display the amount of letter grades there are for example if there are three As in the finally section it should display A's: 3. im not very sure how to do that what my code has is a skeleton any help appreciated thanks. 
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  #include <iostream>

using namespace std;

int main()

{
    const int MIN_VALUE = 1;
    const int MAX_VALUE = 10;
    const int SENTINEL = 999;

    char letterGrade = ' ';
    string teacherName = " ";
    string studentName = " ";
    string className = " ";

    int numStudents = 0;
    int numTest = 0;
    int counter = 0;


    double testScore = 0;
    double studentAverage = 0;
    double classAverage = 0;
    double totalGrade;



    cout << "Enter the teachers name: ";
    cin >> teacherName;
    getline (cin, teacherName);

    cout << "Enter the class designation: ";
    cin >> className;



    cout << "Enter the number of students: ";
    cin >> numStudents;
    while (numStudents < 0)
    {
        cout << "Please enter a positive number: ";
        cin >> numStudents;
    }


    for (int x = 1; x <= numStudents; x++)
    {
        cout << "Enter students name: ";
        cin >> studentName;
        getline (cin, studentName);


        for (double loopCounter = 1, total = 0; loopCounter < MAX_VALUE; loopCounter++)
        {

            cout << "Please enter a number from 0 - 100 or type 999 to stop: ";
            cin >> testScore;


            if (testScore != SENTINEL)
            {
                total += testScore;
                studentAverage = total / loopCounter;
                numTest++;

            }

            else
            {
                break;
            }

            totalGrade = totalGrade + total;

        }

        cout << "Student Average: " << studentAverage << endl;

    }


    if (studentAverage > 90)
        letterGrade = 'A';
    else if (studentAverage >= 80)
        letterGrade = 'B';
    else if (studentAverage >= 70)
        letterGrade = 'C';
    else if (studentAverage >= 60 )
        letterGrade = 'D';
    else if (studentAverage <= 50)
        letterGrade = 'F';

    classAverage = totalGrade / numStudents;
    cout << "Class average: " << classAverage << endl;

    cout << "Teacher: " << teacherName << endl;
    cout << "Class: " << className << endl;


while (counter > 1)
{
    cout << "Student: " << studentName ;
    cout << "\t\t Average: " << studentAverage ;
    cout << " \t\tGrade: " << letterGrade << endl;
    counter++;

}
cout << "Student count: " << numStudents << endl;
    cout <<"Student average: " << classAverage << endl;

    cout << "A's: "  << endl;
    cout << "B's: " << endl;
    cout << "C's: " << endl;
    cout << "D's: " << endl;
    cout << "F's: " << endl;



}
natdomi (6)
also for this area im supposed to show the out put of more than one student along with his/her grade and average and its only showing me the output of one student, i know the loop is wrong but im not quite sure which loop to use ive used a while loop, do while loop and for loop, although i believe i may be formatting the for loop incorrectly 
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while (counter > 1)
{
    cout << "Student: " << studentName ;
    cout << "\t\t Average: " << studentAverage ;
    cout << " \t\tGrade: " << letterGrade << endl;
    counter++;

}
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