Java Program to Find Sum of Elements of an Array

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Enhancing programming skills is very important no matter what language you have chosen. So, practice frequently with these simple java programs examples and excel in coding the complex logic.

Java Program to Find Sum of Elements of an Array

  • How to add all elements of an array using loop in Java.
  • Write a Java program to calculate sum of all array elements.

Given an array of N integers. We have to find the sum of all elements of array from index 0 to N-1.

Input Array
3 7 2 9 4 10 11 0 -1
Sum of Array Elements
45

Algorithm to find sum of all array elements
Let inputArray is an integer array having N elements.

  • Declare an integer variable ‘sum’ and initialize it to 0. We will use ‘sum’ variable to store sum of elements of array.
  • Using for-each loop, we will traverse inputArray and add each element to sum variable.
  • After termination of for-each loop, “sum” variable will contain the sum of all array elements.

Java program to add all elements of an array

Java program to add all elements of an array

package com.tcc.java.programs;
 
import java.util.*;
 
public class ArrayElementSum {
    public static void main(String args[]) {
        int count, sum = 0, i;
        int[] inputArray = new int[500];
        Scanner in = new Scanner(System.in);
 
        System.out.println("Enter number of elements");
        count = in .nextInt();
        System.out.println("Enter " + count + "elements");
        for (i = 0; i < count; i++) {
            inputArray[i] = in .nextInt();
        }
 
        for (int num: inputArray) {
            sum = sum + num;
        }
 
        System.out.println("Sum of all elements = " + sum);
    }
}

Output

Enter number of elements
5
Enter 5elements
3 8 1 7 2
Sum of all elements = 21