From: Samir Benmendil <me@rmz.io>
Date: Sat, 13 Jan 2018 22:06:26 +0000 (+0000)
Subject: Print the sum of two arguments
X-Git-Url: https://git.rmz.io/my-scheme.git/commitdiff_plain/0742b9f77a6fe617f929e21e143e35cd6e3d3ed6?hp=5bd76ea90313c3b469e1b7fce192f3cd54c57a33

Print the sum of two arguments

`read`'s type is defined as `read :: (Read a) => String -> a`, i.e.
`read` takes as `String` and returns an `a` (number?). I don't know what
`=>` means. (`(Read a)` is an instance of class Read ?)

`show`'s type is a bit more complicated it seems as it has multiple
instances for various types of input. But in essence it takes a type and
returns a `String`.
---

diff --git a/app/Main.hs b/app/Main.hs
index cdd564b..16e4939 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -4,4 +4,4 @@ import System.Environment
 main :: IO ()
 main = do
     args <- getArgs
-    putStrLn (args !! 0 ++ args !! 1)
+    putStrLn (show (read (args !! 0) + read (args !! 1)))