[Haskell-cafe] IO platform for testing
ijones at syntaxpolice.org
Sun Jul 17 01:00:58 EDT 2005
yin <yin at atom.sk> writes:
> first I have to apologise for my English.
Don't worry about that.
> ./bundle01 <cmd> <arg1> <arg2> ...
> I more apoarches, but no one worked. Now I tried this:
> m01_mod :: Int -> Int -> Int
What's m01? You define b01 below:
> b01_mod a b = a mod b
You must type that "mod a b" or "a `mod` b".
> main = do
> (cmd:ss) <- getArgs
> putStrLn (
> if (cmd == "mod") then do
You don't need the "do" here. Since the type of the entire "if"
statement is a String (not an IO String) this is an error.
> show (b01_mod (read (ss!!1)) (read (ss!!2)))
> else do
> "unknown command!")
> Please, send me somethung like this (I need to understand it). I need
> runing more <cmd>s and with various argument counts and types. All
> functions "in a bundle" should be in one file.
Otherwise, looks roughly correct to me... The program will crash with
a meaningless error if they don't enter any args.
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