Java/07-Java-Programs/035-Sum-of-First-N-Numbers.java at main · shaikbasha-dev/Java · GitHub

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* ============================================================================

* Program Name : Sum of First N Numbers

* File Name : 035-Sum-of-First-N-Numbers.java

* Class Name : SumOfFirstNNumbers

* Description:

* This program accepts a positive integer from the user and calculates

* the sum of the first N natural numbers using the for loop.

* Objective:

* - Understand user input using the Scanner class.

* - Learn how to use the for loop.

* - Calculate the sum of the first N natural numbers.

* Author : Shaik Mahaboob Basha

* Repository : 01-Core-Java

* Folder : 08-Java-Programs

* ============================================================================

import java.util.Scanner;

public class SumOfFirstNNumbers {

// The main() method is the entry point of every Java application.

public static void main(String[] args) {

// Create a Scanner object to read input from the keyboard.

Scanner scanner = new Scanner(System.in);

// Ask the user to enter the value of N.

System.out.print("Enter the Value of N: ");

// Read the value entered by the user.

int n = scanner.nextInt();

// Declare and initialize a variable to store the sum.

int sum = 0;

// Check whether the entered value is valid.

if (n <= 0) {

// Display an error message.

System.out.println("Please enter a positive integer.");

// Example Output: Please enter a positive integer.

} else {

// Iterate from 1 to N using the for loop.

for (int i = 1; i <= n; i++) {

// Add the current number to the sum.

sum = sum + i;

}

// Display the calculated sum.

System.out.println("Sum of First " + n + " Natural Numbers = " + sum);

// Example Output:

// Enter the Value of N: 10

// Sum of First 10 Natural Numbers = 55

}

// Close the Scanner object to release system resources.

scanner.close();

}

Java/07-Java-Programs/035-Sum-of-First-N-Numbers.java at main · shaikbasha-dev/Java · GitHub

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