Java program to print sum of first n natural numbers

In this article we will learn to implement a Java program to print sum of first n natural numbers. A Java program is provided below which reads n and prints the sum of the first n natural numbers.

Following program reads a number n from the user and displays the sum of first n natural numbers:

import java.util.Scanner;

public class Driver
{	
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.println("Enter a number: ");
		int n = input.nextInt();
		int sum = 0;
		for(int i = 1; i <= n; i++)
			sum = sum + i;
		System.out.println("Sum of the digits in the given number is: " + sum);
		input.close();
	}
}

Input and output for the above program is as follows:

Enter a number: 
10
Sum of the digits in the given number is: 55

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.