지침
이 연습 문제에서 해야 할 일은 "The Twelve Days of Christmas"라는 노래의 가사를 반환하는 코드를 작성하는 거예요.
"The Twelve Days of Christmas"는 널리 알려진 영어 크리스마스 캐럴이에요.
노래의 각 절은 그 앞 절에 이어서 내용이 쌓여 가요.
코드가 반환하는 가사는 아래에 나온 전체 노랫말과 정확히 일치해야 해요.
가사
On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.
On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.
On the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the fourth day of Christmas my true love gave to me: four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the fifth day of Christmas my true love gave to me: five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the sixth day of Christmas my true love gave to me: six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the seventh day of Christmas my true love gave to me: seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the eighth day of Christmas my true love gave to me: eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the ninth day of Christmas my true love gave to me: nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the tenth day of Christmas my true love gave to me: ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the eleventh day of Christmas my true love gave to me: eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
On the twelfth day of Christmas my true love gave to me: twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.
테스트 주도 개발
테스트 파일 맨 위에 있는 주석을 꼭 확인해 봐요.
함수가 어떤 출력을 내야 하는지 이해하는 데 도움이 될 거예요.
이 연습 문제는 최소한의 코드와, 각 절 사이에 중복되는 많은 하드코딩된 텍스트만으로도 풀 수는 있어요.
그런데 이 노래는 누적 노래의 한 종류로, 새 절이 나올 때마다 앞의 절을 이어받아 만들어져요.
프로그래밍 연습을 좀 더 해 보고 싶다면, 각 절을 부분부분 모아서 조립해 보는 건 어때요?
예를 들어 각 절에서 요일이 바뀌고 선물이 바뀌며, 나머지 부분은 거의 똑같아요.
그럼 반복을 피하려면 어떤 방법이 좋을까요?
