Haskell：将 Int 转换为 String
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Haskell: Converting Int to String
提问by Squirrelsama
I know you can convert a Stringto an number with read:
我知道你可以将 a 转换String为一个数字read：
Prelude> read "3" :: Int
3
Prelude> read "3" :: Double
3.0
But how do you grab the Stringrepresentation of an Intvalue?
但是你如何获取String一个Int值的表示呢？
回答by Chuck
The opposite of readis show.
的反义词read是show。
Prelude> show 3
"3"
Prelude> read $ show 3 :: Int
3
回答by prasad_
An example based on Chuck's answer:
一个基于查克回答的例子：
myIntToStr :: Int -> String
myIntToStr x
| x < 3 = show x ++ " is less than three"
| otherwise = "normal"
Note that without the showthe third line will not compile.
请注意，没有show第三行将无法编译。
回答by Arlind
Anyone who is just starting with Haskell and trying to print an Int, use:
任何刚开始使用 Haskell 并尝试打印 Int 的人，请使用：
module Lib
( someFunc
) where
someFunc :: IO ()
x = 123
someFunc = putStrLn (show x)
