Java Program to Find Sum of Natural Numbers using While Loop

This is a Java Program to Find Sum of Natural Numbers Using While Loop.

Enter the number upto which you want to calculate the sum. Now we use while loops till the given number to get the desired output.

Here is the source code of the Java Program to Find Sum of Natural Numbers Using While Loop. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. public class Natural 
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int x, i = 1 ;
  6.         int sum = 0;
  7.         System.out.println("Enter Number of items :");
  8.         Scanner s = new Scanner(;
  9.         x = s.nextInt();
  10.         while(i <= x)
  11.         {
  12.             sum = sum +i;
  13.             i++;
  14.         }
  15.         System.out.println("Sum of "+x+" numbers is :"+sum);
  16.     } 
  17. }


$ javac
$ java Natural
Enter Number of items :
Sum of 55 numbers is :1540

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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