A simple program to solve the grades of the students using a  C programming language.

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Program Listing

#include <stdio.h>
#include <stdlib.h>

int sum_of_array(int array[], int size)
{
	int sum = 0;

	for (int i = 0; i < size; ++i)
		sum += array[i];

	return sum;
}

char getGrade(int grade)
{
	 if (grade >= 91 && grade <= 100)
			return 'A';
	 else if (grade >= 81 && grade <= 90)
			return 'B';
	 else if (grade >= 71 && grade <= 80)
			return 'C';
	 else if (grade >= 61 && grade <= 70)
			return 'D';
	 else if (grade <= 60)
			return 'E';

	 return 0;
}

int main()
{
	printf("\n");
	printf("\tComputation of Grades in C");
	printf("\n\n");
	printf("How many grades: ");
	int num_grades;
	scanf("%d", &num_grades);
	int *grades = malloc(num_grades * sizeof(int));
	for (int i = 0; i < num_grades; ++i)
	{
		printf("Enter grade %d: ", i + 1);
		scanf("%d", &grades[i]);
	}
	int total_sum = sum_of_array(grades, num_grades);
  int avg = (total_sum / num_grades) * 10;
  printf("\n");
  printf("Your Grade is %d: \tDescriptive Rating: %c", avg, getGrade(avg));
  printf("\n");
  free(grades);

	return 0;
}