Average Grade Checker in C with Remarks

#include <stdio.h>

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

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

    while (1) {
        printf("\n\tEnter grade: ");
        scanf("%d", &grade);

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

        sum += grade;
        count++;
    }

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

    double average = (double)sum / count;

    printf("\n\tAverage grade: %.0f\n", average);
    printf("\n");

    // Determine the corresponding grade category
    if (average == 100) {
        printf("\n\tExcellent\n");
    } else if (average >= 95 && average <= 99) {
        printf("\n\tVery Satisfactory\n");
    } else if (average >= 90 && average <= 94) {
        printf("\n\tSatisfactory\n");
    } else if (average >= 85 && average <= 89) {
        printf("\n\tOutstanding\n");
    } else if (average >= 80 && average <= 84) {
        printf("\n\tGood\n");
    } else if (average >= 75 && average <= 79) {
        printf("\n\tPass\n");
    } else {
        printf("\n\tFail\n");
    }
    printf("\n\n");
    printf("\tEnd of Program\n\n");
    return 0;

}