• Rahul Kumar

Sum of Even Numbers till N

Given a number N, print sum of all even numbers from 1 to N.


Input Format :
Integer N
Output Format :
Required Sum
Sample Input 1 :
6
Sample Output 1 :
12



Solution :

/*
	
	Pre-requisite to solve this problem:
	In this question, we have to find sum of all even numbers till n. To take sum of all the even numbers, we have to take a variable and initialize it to zero. Let us name this variable as sum. 
	Following code is used to add 2 to sum variable and update it to the same sum variable:
	sum = sum + 2 
	
	Hint to solve this problem: We will have to loop on even numbers only and add the even numbers to the same sum variable, described above.
*/  

import java.util.Scanner;
public class Solution {

	public static void main(String[] args) {
		
		/* Your class should be named Solution.
	 	* Read input as specified in the question.
	 	* Print output as specified in the question.
		*/
        Scanner input = new Scanner(System.in);
        
        int n = input.nextInt();
		 int i = 2;
		 int sum = 0;
		 
	        while (i <= n){
	        sum = sum+i;
	        i = i + 2;
		}
	        System.out.println(sum);  

	}

}

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