Read two arguments from commandline

`!!` is the "list indexing" operator. It returns the value in the list
on the lhs at the index on the rhs.

`++` concatenates two lists.

A string is a list of chars.

diff --git a/app/Main.hs b/app/Main.hs
index c0766c1faa3645d237fed54bc0e83d3dbcdd4d08..cdd564b7550b29999e1707a7a0dc8d76aa5e4119 100644 (file)
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -4,4 +4,4 @@ import System.Environment
 main :: IO ()
 main = do
     args <- getArgs
-    putStrLn ("Hello, " ++ args !! 0)
+    putStrLn (args !! 0 ++ args !! 1)