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Today's Topics:
1. formatting? (Alexander Chen)
2. Re: formatting? (Magnus Therning)
----------------------------------------------------------------------
Message: 1
Date: Thu, 7 May 2020 19:01:43 +0200 (CEST)
From: Alexander Chen <alexan...@chenjia.nl>
To: beginners@haskell.org
Subject: [Haskell-beginners] formatting?
Message-ID: <1914130608.288460.1588870903...@ichabod.co-bxl>
Content-Type: text/plain; charset="utf-8"
Hi,
tensDigit.hs
tensDigit :: Integral a => a ->a
tensDigit x = d
where xLast = x `div` 10
d = xLast `mod` 10
prelude> load tensDigit.hs
parse error on input ‘=’
Perhaps you need a 'let' in a 'do' block?
e.g. 'let x = 5' instead of 'x = 5'
4 | d = xLast `mod` 10 | ^
[1 of 1] Compiling Main ( chapter7_8.hs, interpreted )
Failed, no modules loaded.
I suspect this has something to do with the spacing (since this is example
code) if so could someone explain to me what the rules on spacing are so I can
get past this. I am using a simple text editor so if someone has a
recommendation for an IDE that simply takes care of this, much obliged!!
best,
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Message: 2
Date: Thu, 07 May 2020 19:23:55 +0200
From: Magnus Therning <mag...@therning.org>
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] formatting?
Message-ID: <87368bodzo....@therning.org>
Content-Type: text/plain; charset="utf-8"
Alexander Chen <alexan...@chenjia.nl> writes:
> Hi,
>
> tensDigit.hs
>
> tensDigit :: Integral a => a ->a
> tensDigit x = d
> where xLast = x `div` 10
> d = xLast `mod` 10
>
> prelude> load tensDigit.hs
> parse error on input ‘=’
> Perhaps you need a 'let' in a 'do' block?
> e.g. 'let x = 5' instead of 'x = 5'
> 4 | d = xLast `mod` 10 | ^
> [1 of 1] Compiling Main ( chapter7_8.hs, interpreted )
> Failed, no modules loaded.
>
> I suspect this has something to do with the spacing (since this is
> example code) if so could someone explain to me what the rules on
> spacing are so I can get past this. I am using a simple text editor so
> if someone has a recommendation for an IDE that simply takes care of
> this, much obliged!!
>
Try lining up the definitions in the where-clause. That'll do it.
tensDigit :: Integral a => a ->a
tensDigit x = d
where xLast = x `div` 10
d = xLast `mod` 10
/M
--
Magnus Therning OpenPGP: 0x927912051716CE39
email: mag...@therning.org
twitter: magthe http://magnus.therning.org/
If you can tell the truth, you don't have to remember anything.
— Mark Twain
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