Example: Sum of Even Numbers in Range in Java

// Sum of Even Numbers in Range
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Create a Scanner object to read user input
        Scanner scanner = new Scanner(System.in);

        // Step 2: Prompt the user to enter the start of the range
        System.out.print("Enter the start of the range: ");
        int start = scanner.nextInt();

        // Step 3: Prompt the user to enter the end of the range
        System.out.print("Enter the end of the range: ");
        int end = scanner.nextInt();

        // Step 4: Initialize a variable to store the sum of even numbers
        int sumOfEvens = 0;

        // Step 5: Loop through each number in the given range
        for (int i = start; i <= end; i++) {
            // Step 6: Check if the current number is even
            // A number is even if it is perfectly divisible by 2 (remainder is 0)
            if (i % 2 == 0) {
                // Step 7: If the number is even, add it to the sum
                sumOfEvens += i;
            }
        }

        // Step 8: Print the final sum of even numbers
        System.out.println("The sum of even numbers in the range " + start + " to " + end + " is: " + sumOfEvens);

        // Step 9: Close the scanner to prevent resource leaks
        scanner.close();
    }
}