如何让我的字符串重复x次？ [英] How to get my string repeated x times?

问题描述

我是Haskell的完全noob，我无法让我的代码工作，我不知道如何解决它！我需要帮助:)如果有人有一个想法，我需要看看为了解决我的问题，我会非常有益的想法和推动正确的方向。

我试图创建一个C＃string.Format类型，直到列表完成。这个列表是由userinput创建的，然后我只想要一个字符串被重复直到列表完成。

  test ::整数 - > String 
 let list_n [0..k] 
 test k = putStrLn（r * r）| r<  -  list_n  - 我的想法是，我强制
  - 将整个列表放到r上，并且只要
 --list中有更多的重复列表，但我甚至不会确定这是可能的：任何人有更好的想法如何做到这一点？我想所有的结果是一行而不是一行，因此我尝试创建ittereration，但是在HaskeLL中，说起来容易，然后完成：/ $ / $> 
 
解决方案
这里有两个建议：一个试图匹配你发布的代码，另一个试图匹配你发布的英语。这似乎主要是一个关于语法的问题，所以我不确定有很多有意义的解释可以去 
 
 
   - 匹配代码
 test :: Int  - > ; String 
 test k = concat [show（r * r）| r < -  [0..k]] 
 
  - 匹配英文
 test :: Int - >字符串 - >字符串
 test ks = concat [s | r<  -  [0..k]] 
  
 
I'm a complete noob to Haskell I cant get my code working at all and i have no clue on how to fix it! I need help :) If someone has an idea of where i need to look in order to fix my issue i would be extremly greatful for ideas and nudges in the right direction.


I am trying to create a type of C# string.Format that repeats until a list is finished. The list is created by the userinput and then i just want a string to be repeated untill the list is finished.
    test :: Integer -> String
    let list_n [0..k]
    test k = putStrLn (r * r) | r <- list_n   --My idea here is that i am forcing 
    --the entire list onto r and making it repeated as long as there is more in the
    --list, But im not even sure that is possible :(
Anyone has a better idea on how to do this? I want all the results in a line and not a row therefore im trying to create ittereration but in HaskeLL that is easier said then done :/
解决方案
Here are two proposals; one tries to match the code you posted, and the other tries to match the English you posted. This seems to be mostly a question about syntax, so I'm not sure there's a lot of meaningful explanation that can go along with this other than "read a tutorial".
-- match the code
test :: Int -> String
test k = concat [show (r * r) | r <- [0..k]]

-- match the English
test :: Int -> String -> String
test k s = concat [s | r <- [0..k]]


                        
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