Haskell - 元组

简单玩一下元组

有意思的是Haskell中的元组，不仅如同Python中一样可以随便放东西，而且可以当作结构体用
如果元组有里面只有两个元素，就可以当作键值对用，真不错啊真不错~

numberAndNumber = (1,3)
triples = [(a,b,c) | a <- [1..10], b <- [1..10], c <- [1..10]]
rightTriangles = [(a,b,c) | c <- [1..10], a <- [1..c], b <- [1..a], a^2 + b^2 == c^2]
someItem = (1,'a', "HelloWorld", True)
main = do
    putStrLn "Hello, tuple!"
    print numberAndNumber
    print someItem
    --对于序队可使用
    print (fst numberAndNumber)
    print (snd numberAndNumber)

    --创建序对
    print (zip [x | x <- [1..10], odd x] ['a'..'z'])
    print (zip [1..] ["Python","C","C++","Java"])

    -- 打印0~10之类边长的三角形
    print rightTriangles