Java Program to Find Sum and Average of All Elements in an Array

In this post, you will learn how to find the sum and average of all elements in an array using the Java programming language.

Algorithm

1. Start
2. Initialize
   sum = 0
   n = size of the array
3. Input the elements of the array.
4. For each element i in the array (from index 0 to n-1)
   • Add the element to sum.
   • sum = sum + array[i]
5. Calculate the average: average = sum / n
6. Output the sum and average.
7. End

import java.util.Scanner;

public class SumAndAverage {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // Input: Size of the array
        System.out.print("Enter the number of elements in the array: ");
        int n = scanner.nextInt();
        
        // Input: Elements of the array
        int[] array = new int[n];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < n; i++) {
            array[i] = scanner.nextInt();
        }
        
        // Calculate sum of elements
        int sum = 0;
        for (int i = 0; i < n; i++) {
            sum += array[i];
        }
        
        // Calculate average of elements
        double average = (double) sum / n;
        
        // Output the results
        System.out.println("Sum of all elements: " + sum);
        System.out.println("Average of all elements: " + average);
        
        scanner.close();
    }
}

Enter the number of elements in the array: 5
Enter the elements of the array:
10
20
30
40
50
Sum of all elements: 150
Average of all elements: 30.0

Explanation:

Step 1: We start by initializing the sum to 0 and determining the size of the array n.
Step 2: The elements of the array are read from the user or input source.
Step 3: We iterate through each element in the array, adding its value to the sum.
Step 4: After computing the total sum, we calculate the average by dividing the sum by the total number of elements n.
Step 5: Finally, we output the calculated sum and average.

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