Utasítások
Ebben a feladatban olyan kódot kell írnod, amely visszaadja a(z) »The Twelve Days of Christmas« című dal szövegét.
A »The Twelve Days of Christmas« egy közismert angol karácsonyi dal.
A dal minden további versszaka az előző versszakra épül.
A kódod által visszaadott dalszövegnek pontosan meg kell egyeznie az alább látható teljes dalszöveggel.
Dalszöveg
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.
Tippek
Meg kell valósítanod a recite függvényt, amely kiírja a „The Twelve Days of Christmas” dal szövegét. Használhatod a megadott szignatúrát, ha bizonytalan vagy a típusokban, de ne hagyd, hogy korlátozza a kreativitásodat.
Ez a feladat szöveges adatokkal dolgozik. Történelmi okokból a Haskell String típusa ugyanaz, mint a [Char], azaz karakterek listája. A szöveges adatok hatékonyabb kezeléséhez a Text típus használható.
A feladat opcionális kiterjesztéseként
import qualified Data.Text as T
import Data.Text (Text)
- írhatsz például
recite :: Int -> Int -> [Text]-et, és például T.pack néven hivatkozhatsz a Data.Text kombinatorokra.
- kikeresheted a
Data.Text dokumentációját.
- lecserélheted a
String összes előfordulását Text-re a TwelveDays.hs fájlban, azaz:
recite :: Int -> Int -> [Text]
Ez a rész teljesen opcionális.
