Java Program to find sum and average of N numbers

Java / java programming

In this post, we will write a two java program to Find Sum and Average of N numbers using an array. The first program finds the average of specified array elements. The second program takes the value of N and the numbers provided by the user and finds the average of them using an array.

To understand these programs you should have knowledge of following concepts:

Java Arrays
For loop

How the program will work?

First of all, accept an array.
Now using loop we calculate the sum of elements of the array.
Hence we have sum the divide it by array count to get average.

Example:

Input:
Enter the array size: 5
Enter the 5 array elements
6
4
5
8
6
Output:
Sum of 5 number is 29.
Average is 5.8.

Example 1: Program to Calculate average using Array

In this program, we have a predefined value of array which will get add using for loop and then calculate the average by dividing the sum by count of array count.

public class demo {
    public static void main(String[] args) {
        int arr[] = {5,6,48,6,78,20,65};
        int len = arr.length;
      	double avg =0;

        double sum = 0;

        for (int i=0;i<len;i++){
            sum += arr[i];
        }
        avg = sum/len;
        System.out.println("Sum of "+len+" number in "+sum);
        System.out.println("Average is "+avg);
    }
}

Output:

Sum of 7 number in 228.0
Average is 32.57

Example 2: Program to Calculate the average of numbers entered by the user

In this program, we are using a Scanner to get the value of n and all the numbers from the user. First of all, take the array size for the user and then accept the array value using a loop. After that calculate the Sum of the array element using second for loop and divide it by array size to get the average of an array.

import java.util.Scanner;

public class sum_of_array {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the array size: ");
        int len = sc.nextInt();
        int arr[] = new int[len];
        double sum = 0;
        double avg = 0;

        System.out.println("Enter the 5 array element");
        for (int i=0;i<len;i++){
            arr[i] = sc.nextInt();
        }
        for (int i=0;i<len;i++){
            sum += arr[i];
        }
        avg = sum/len;
        System.out.println("Sum of "+len+" number in "+sum);
        System.out.println("Average is "+avg);
    }
}

Output:

Enter the array size: 5
Enter the 5 array element
45
48
65
35
48
Sum of 5 number in 241.0
Average is 48.2

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