Letter Grades in Java

 A simple letter grades program in Java programming language.

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Program Listing
/* grades.java
 *
 * Author : Jake Rodriguez Pomperada, MAED-IT, MIT
 * www.jakerpomperada.com  and www.jakerpomperada.blogspot.com
 * jakerpomperada@gmail.com
 * Bacolod City, Negros Occidental Philipipines
 */

import java.util.Scanner;

public class letter_grades
{
  private static int sumOfArray(int [] arr)
  {
   int sum = 0;
  
   for (int i : arr)
       sum += i;
  
   return sum;          
  }
  private static 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;
  }
  public static void main(String[] args) 
  {
    System.out.println("\n\tLetter Grades in Java\n");
    System.out.print("# of grades: ");
    
    Scanner input = new Scanner(System.in);
    int numberOfGrades = input.nextInt();
    int[] scores = new int[numberOfGrades]; 
    
    for (int i = 0; i < scores.length; i++) 
    {
      System.out.printf("Grade (%d): ", i + 1);
      scores[i] = input.nextInt();        
    }
    int total_sum = sumOfArray(scores);
    int avg = (total_sum / numberOfGrades) * 10;
       
    String output = "";
    output += "Your Grade is " + avg + ": Descriptive Rating: " + getGrade(avg);
       
    System.out.println(output);
    input.close();
  }
}