G.C.Stavenga:
Hi, I'm just started to learn Haskell. Coming from a programming contest background (where it is important to be able to solve problems in a small amount of code) I'm wondering what the best way is for simple IO.
A typical input file (in a programming contest) is just a bunch of numbers which you want to read one by one (sometimes interspersed with strings). In C/C++ this is easily done with either scanf or cin which reads data separated by spaces. In Haskell I have not found an equally satisfactionary method. The methods I know of
1) Stay in the IO monad and write your own readInt readString functions. A lot of code for something easy.
2) Use interact together with words and put the list of lexemes in a State monad and define getInt where at least you can use read.
3) Use ByteString.Char8 which has readInt (but I couldn't find a readString). But one has to put it also in a State monad.
I think that there must be standard function that can do this. What do experienced Haskellers use?
map read . lines