[프로그래머스] 짝수의 합_Lv.0

https://school.programmers.co.kr/learn/courses/30/lessons/120831

using System;

public class Solution {
    public int solution(int n) {
        int answer = 0;
        int i = 0;
        while (i<= n)
        {
           answer += i;
           i += 2;
        }
            
        return answer;
    }
}