Question

Write a Java program that will first ask the user how many grades they want to enter. Then use a do…while loop to populate an array of that size with grades entered by the user. Then sort the array. In a for loop read through that array, display the grades and total the grades. After the loop, calculate the average of those grades and display that average.

Specifications

• Prompt the user for the number of grades they would like to find the average of. This will be the length of the array you want to create.
• Create an array of the proper size to hold the grades the user will enter.
• Set up a do…while loop to read in the grades that will populate the array.
• Sort the array using the Arrays.sort method.
• Set up a for loop to iterate through the array you just created and accumulate those grades.
• Find the average of those grades.
• Use: good variable names, indentations of four spaces, comments within the program code, and label the output appropriately.

Answer 1

import java.util.Arrays;
import java.util.Scanner;
public class ArraySumAvg{

   public static void main (String args[])
   {
       double sum=0;
      
           Scanner sc = new Scanner (System.in);
           System.out.print("Enter how many grades you want: ");
           int n=sc.nextInt();
           System.out.print("Enter Array elements: ");
           int[] arr=new int[n];
           for(int i=0;i<n;i++)
           {
               arr[i]=sc.nextInt();
           }
           //sort array
           Arrays.sort(arr);
          
           System.out.println("Array is after sort: ");
           int i=0;
          
           //populate the array using do..while loop
           do
           {  
               System.out.print(arr[i]+" ");
               i++;
           }
           while(i<n);
          
          
          
          
          
           //average of grade
           for(i=0;i<n;i++)
           {
               sum+=arr[i];
           }
           double avg=sum/n;
           System.out.println();
          
           System.out.println("Average is: "+avg);
  
   }
     
}