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Java Source code example: How to Add Numbers in an Array using For Loop

Updated on October 31, 2013

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This is a Java source code on how to add numbers inside an array using for loop version, this program has also another version on how to add numbers in an array using recursion, if you want to see it too, here is the link to view the page..

In comparison of the other version, you would discover that adding numbers inside an array using for loop is easier to understand and the code is easy to trace. Although both of them has its own advantages, it is really important to know the depth of recursion for other complicated program can only be easily solved using recursion and much complicated on for loop, the best example is the tower of hanoi, it was program using recursion. So, to know how recursion works you can surf my other program which uses recursion, Below is the java source code on adding numbers in an array using for loop.

Java Source code: How to Add Numbers inside an Array using For Loop

//main class


import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the size of the input you want to enter: ");
        int size = input.nextInt();
        int[] numArr = new int[size];
        int sum=0;
        
	System.out.print("Enter "+ size +" numbers: ");
        
	for(int i=0; i<numArr.length; i++)
        {
          numArr[i]=input.nextInt();
          sum = sum + numArr[i];
        }
    
        System.out.print("The sum of the numbers is: " + sum);
    }
}
source:linux-mag.com
source:linux-mag.com

Sample Output:

Enter the size of the input you want to enter: 5

Enter 5 numbers: 34 2 5 3 6

The sum of the numbers is: 50

If you want to make a method and segregate the implementation of sum for the sake of practice in Object Oriented Programming, just simply code it this way.

//java class

public class ArraySum
{
    public int sumOfArray(int[] array)
    {
        int sum = 0;
        for(int i=0; i<array.length; i++)
        {
            sum = sum + array[i];
        }

        return sum;
    }
}

//main class


import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the size of the input you want to enter: ");
        int size = input.nextInt();
        int[] numArr = new int[size];
        
        System.out.print("Enter "+ size +" numbers: ");
        for(int i=0; i<numArr.length; i++)
        {
          numArr[i]=input.nextInt();
         
        }

        ArraySum access = new ArraySum();
        System.out.print("The sum of the numbers is:" + access.sumOfArray(numArr));        

    }
}

Here is the sample output for the code above.

Sample Output:

Enter the size of the input you want to enter: 5

Enter 5 numbers: 2 5 3 7 25

The sum of the numbers is:42




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    • aisha91 profile image
      Author

      Rasna Aisha 5 years ago from Manila, Philippines

      Thanks John Pitt :)

    • profile image

      charissa remol 4 years ago

      T.Y John pitt

    • profile image

      swati.g 4 years ago

      thank u soo much for clearing my dout....

    • aisha91 profile image
      Author

      Rasna Aisha 4 years ago from Manila, Philippines

      Your welcome. :)

      I know how hard it is to have a lack of comparison in codes, for beginners in java and other programming languages, the more you have the example codes available for comparison, the more you gain understanding about the certain programming language. Glad it helps :)

      Happy programming swati.g

    • profile image

      rollybantilan 4 years ago

      can you teach a program in variable and sum

    • Atz profile image

      Athul M R 4 years ago from Calicut, Kerala, INDIA

      Simple and easy to understand, thanks =)

    • aisha91 profile image
      Author

      Rasna Aisha 4 years ago from Manila, Philippines

      Hi rollybantilan,

      Sorry for the so late reply, I am busy lately on my own website, but I will put my whole attention now here, just wait for my other tutorials, they are on the way. I am planning to redesign all my tutorials here so that it would be more useful and understandable and funny too :) thank you for your continues interest. Happy programming.

    • aisha91 profile image
      Author

      Rasna Aisha 4 years ago from Manila, Philippines

      Hello atz,

      Thanks for your kind comment. Comment like that inspires me...:)

    • profile image

      versatile-citizen 4 years ago

      Nice. Easy for a beginner to grasp.

    • profile image

      sloka 3 years ago

      can v use 'println' instead of 'print'?

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