If문 -> p.98 -> 조건식의 다양한 예 (p.99)
switch문 :
for문 : 예제 중 "%2d"는 무엇인가? -> p.112 (참고 : https://www.basic4mcu.com/bbs/board.php?bo_table=gac&wr_id=2824, https://www.todayhumor.co.kr/board/view.php?table=jisik&no=146123)
while문