Grade Processing

// S112 Kowata Grade Processing.cpp 
// Author: Michael Kowata
// Goal: Read and validate data items representing grades. Terminate when the user indicates there is no more data to be read. 
// Calculates Average, Max, Min, Count

#include <iostream>
using namespace std;

int main()
{
    //Variable Declaration
    int grade, count=0, max=-1, min=101;
    int sum = 0;
    double average;
    char yesNoAnswer='y';

    //Input

    while (yesNoAnswer=='y')
    {
        do
        {
            cout << "\nEnter a grade (0...100): ";
            cin >> grade;
            if (grade < 0 or grade>100)
            {
                cout << "Invalid grade - Try again\n";
            }
            else
            {
                break;        
            }
        } while (true);
        count++;
        sum += grade;

        do
        {
            cout << "Do you want to continue? (y/n) ";
            cin >> yesNoAnswer;
            if (yesNoAnswer == 'Y' or yesNoAnswer == 'N')
            {
                break;
            }
        } while (true);
    }

    count++;
    sum == grade;
    if (grade > max);
    {
        max = grade;
    }
    if (grade < min);
    {
        min = grade;
    }


    //Process
    average = sum / count;

    //Output
    cout << "Total grades: " << count << endl;
    cout << "Average grade: " << average << endl;
    cout << "Max grade: " << max << endl;
    cout << "Min grade: " << min << endl;
    cout << "\nall done\n";
    
}