1986. 지그재그 숫자

SW Expert 1986. 지그재그 숫자

* 문제의 저작권은 SW Expert에 있습니다 

import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Solution {
 
    static int answer;
 
    public static void main(String[] args) throws Exception {
 
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        //BufferedReader br = new BufferedReader(new FileReader("input.txt"));
 
        int T = Integer.parseInt(br.readLine());
        for(int test_case = 1; test_case <= T; test_case++) {
            answer = 0;
            int N = Integer.parseInt(br.readLine());
            int sum = 0;
            if (N>=1 && N<=10) {
                for (int i = 1; i <= N; i++) {
                    if (i%2 !=0) {
                        sum = sum +i;
                    } else {
                        sum = sum -i;
                    }
                }
                answer = sum;
            }
            System.out.println("#" + test_case +" " + answer );
        }
        br.close();
    }
}