int main(void) /* main function begins execution */
{
	int grade[10], counter; /* grade is the array of input grades, counter keeps track of the number of nonzero elements of the array: it's 'size' for our purposes*/
	char sentinel; /* a reusability sentinel */
	
	/* printing the welcome message and prompting for input */
	printf("Welcome to the automatic grading system:\n");
	printf("Do you want to average a student's grade? (y/n) ");
	
	/* inputting the sentinel */
	scanf("%c", &sentinel);

	/* while our reusability condition is met, repeat the program */
	while(sentinel == 'y' || sentinel == 'Y') {
		counter = 0;

		do {
			printf("Enter grade\t");
			scanf(" %d", &grade[counter]);
			counter++;
			printf("counter is %d", counter);
		} while(grade[counter - 1] != 0 && counter < 9);

	}


    
    return 0;
}