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.
public class Natural
public static void main(String args)
int x, i = 1 ;
int sum = 0;
System.out.println("Enter Number of items :");
Scanner s = new Scanner(System.in);
x = s.nextInt();
while(i <= x)
sum = sum +i;
System.out.println("Sum of "+x+" numbers is :"+sum);
$ javac Natural.java $ java Natural Enter Number of items : 55 Sum of 55 numbers is :1540
Sanfoundry Global Education & Learning Series – 1000 Java Programs.