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Java Program to Find the Sum of All Even Numbers

Write a Java program to find the sum of all even numbers between 1 to n. Suppose, if the value of n is 10 then we will calculate the sum of all the even numbers between 1 to 10.

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What is Even Number ?

A even number is a number which is divisible by 2.  For example - 2, 4, 6, 8 etc.

Logic to Find the Sum of all even numbers

i) Take a value of n as input from a user.

ii) Run a loop from 1 to n and check whether a number is divisible by 2. If it's a divisible by 2 then add the value.

Java Program to Find the Sum of All Even Numbers


import java.util.*;

public class EvenNumbers {

    
    public static void main(String[] args) {
        
        int n, sum = 0;
        
        System.out.println("Enter a number");
        
        Scanner in = new Scanner(System.in);
        n = in.nextInt();
        
        //Sum of all even numbers between 1 to n
        
        for(int i = 2; i <= n; i++) {
            
            /*If number is divisible by 2, 
             *then it's a even number
             */       
            if(i % 2 == 0) {
                sum = sum + i;
            }
        }
        
        System.out.println("The sum of all even numbers between 1 
                             to " + n + " is " + sum);
    }
    
}



Output :

Enter a number
20

The sum of all even numbers between 1 to 20 is 110

Program to add two numbers in Java

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