[Haskell]How to read in haskell and solve simple problems

Question

Hello,
I'm an experienced C/C++ programmer and I would like to use Haskell to solve some problems.
But it is hard to me to write a simple way to read input from a file and analyze it, so I ask you how to do this. I didn't find how to do this around google or this forum, that's why I came to here.
Suppose we are given this problem:
"We're analyzing numbers and we want to know which numbers are even. The input consists on a number, N, and then N lines which contain a single integer. You are to say what numbers are even."
INPUT EXAMPLE:
3
1234
5555555
123044390581349287182
OUTPUT EXAMPLE:
yes
no
yes
I wrote the module that returns a string depending on if the number is even or not... But I would like to know how to repeat that function for N numbers. I don't want a superoptimized way or a strange way, I just want a simple and readable one...
In C++ i would do:
for (int i = 0; i < cases; i++)
cin >> number;
cout << analyze(number) << endl; // analyze returns a string
Can you iluminate with your knowledge, archers?
Thank you.

Answer 1

Well, you said that the first line has the number N, followed by N lines. Given your description the program would always test the whole file.
If you have a file with X lines and you'd only like to test N <= X  lines, this should do it:
module Main where
import System.IO
import Control.Applicative
main = do
let test x = if even (read x) then "yes" else "no"
withFile "test" ReadMode $ \handle -> do
nlines <- read <$> hGetLine handle
content <- hGetContents handle
mapM_ ( putStrLn . test )
. take nlines
. lines
$ content