1에서
Warning: Undefined array key "n" in /users/2018/i1858026/public_html/2019/webprog/ch08/exam08-05.php on line 19
까지 자연수의 합은
Warning: Undefined array key "n" in /users/2018/i1858026/public_html/2019/webprog/ch08/exam08-05.php on line 20
0 입니다.