5.4.3 : Print the sum and average of an array\'s elements. Modify the program to

Question

5.4.3 : Print the sum and average of an array's elements.

Modify the program to print the average as well as the sum. Hint: You don't actually have to change the loop, but rather change what you print.

import java.util.Scanner;

public class ArraySum {
   public static void main(String[] args) {
      Scanner scnr = new Scanner(System.in);
      final int NUM_ELEMENTS = 8;             // Number of elements
      int[] userVals = new int[NUM_ELEMENTS]; // User numbers
      int i = 0;                              // Loop index
      int sumVal = 0;                         // For computing sum

      // Prompt user to populate array
      System.out.println("Enter " + NUM_ELEMENTS + " integer values...");
     
      for (i = 0; i < NUM_ELEMENTS; ++i) {
         System.out.println("Value: ");
         userVals[i] = scnr.nextInt();
      }

      // Determine sum
      sumVal = 0;
     
      for (i = 0; i < NUM_ELEMENTS; ++i) {
         sumVal = sumVal + userVals[i];
      }
      System.out.println("Sum: " + sumVal);
     

      return;
   }
}

Explanation / Answer

/**
* @author Srinivas Palli
*
*/
import java.util.Scanner;

public class ArraySum {
   /**
   * @param args
   */
   public static void main(String[] args) {
       Scanner scnr = new Scanner(System.in);
       final int NUM_ELEMENTS = 8; // Number of elements
       int[] userVals = new int[NUM_ELEMENTS]; // User numbers
       int i = 0; // Loop index
       int sumVal = 0; // For computing sum

       // Prompt user to populate array
       System.out.println("Enter " + NUM_ELEMENTS + " integer values...");

       for (i = 0; i < NUM_ELEMENTS; ++i) {
           System.out.print("Value " + (i + 1) + ": ");
           userVals[i] = scnr.nextInt();
       }

       // Determine sum
       sumVal = 0;

       for (i = 0; i < NUM_ELEMENTS; ++i) {
           sumVal = sumVal + userVals[i];
       }
       System.out.println("Sum : " + sumVal);
       System.out
               .println("Average : " + (float) sumVal / (float) NUM_ELEMENTS);

       return;
   }
}

OUTPUT:

Enter 8 integer values...
Value 1: 1
Value 2: 2
Value 3: 3
Value 4: 4
Value 5: 5
Value 6: 6
Value 7: 7
Value 8: 8
Sum : 36
Average : 4.5

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