Average Grade Checker in C++ with Remarks

#include <iostream>
#include <conio.h>

using namespace std;

int main() {
    int grade;
    int sum = 0;
    int count = 0;

    cout << "\n\n\tAverage Grade Checker in C++ with Remarks\n\n";
    cout << "\n\tEnter grades (enter -1 to finish):\n";

    while (true) {
        cout << "\n\tEnter grade: ";
        cin >> grade;

        if (grade == -1) {
            break;
        }

        sum += grade;
        count++;
    }

    if (count == 0) {
        cout << "\nNo grades entered. Exiting...\n";
        return 0;
    }

    double average = static_cast<double>(sum) / count;

    cout << "\n\tAverage grade: " << average << "\n\n";

    // Determine the corresponding grade category
    if (average == 100) {
        cout << "\n\tExcellent\n";
    } else if (average >= 95 && average <= 99) {
        cout << "\n\tVery Satisfactory\n";
    } else if (average >= 90 && average <= 94) {
        cout << "\n\tSatisfactory\n";
    } else if (average >= 85 && average <= 89) {
        cout << "\n\tOutstanding\n";
    } else if (average >= 80 && average <= 84) {
        cout << "\n\tGood\n";
    } else if (average >= 75 && average <= 79) {
        cout << "\n\tPass\n";
    } else {
        cout << "\n\tFail\n";
    }

    cout << "\n\n";
    cout << "\tEnd of Program\n\n";
    getche();
}