[Haskell-cafe] HELP

[Brian Troutwine]

I'm not sure what you're asking for; it looks like you have to
implement the functions from the specifications.

On Thu, Oct 21, 2010 at 6:11 PM, Yaadallah Khan <yk232 at hotmail.com> wrote:
> I am Studying for an exam, and i have just come accross the following 3
> questions, i am not familiar with the functions, therefore i would
> appreciate any help.
> !! i have already created painting 2 & 3 all i need is the 3 functions, for
> the three different tasks as shown below. the functions are the showPic,
> sizeRaw and isPic.
> questions are:
> 1)  – Define showPic :: Canvas -> IO () for displaying pictures on the
> terminal. Examples:
> Cw2010> showPic (painting 2)
> +---+---+---+---+---+
> | a | n | e | x | a |
> +---+---+---+---+---+
> | m | p | l | e | t |
> +---+---+---+---+---+
> | e | x | t | i | s |
> +---+---+---+---+---+
> | s | h | o | w | n |
> +---+---+---+---+---+
> Cw2010> showPic (painting 3)
> +---+---+---+---+---+---+---+
> | A | n | o | t | h | e | r |
> +---+---+---+---+---+---+---+
> | | t | e | s | t | ! | |
> +---+---+---+---+---+---+---+
> 2)  – Furthermore, define sizeRaw :: Canvas -> (Int, Int) for finding
> out the size of a raw picture as demonstrated here.
> Cw2010> sizeRaw ["anexa","mplet","extis","shown"]
> (5,4)
> 3)  – Finally, define isPic :: Canvas -> Bool for checking a particular
> necessary condition which items of type Canvas must satisfy (full or
> raw). The condition you should check for is whether all the ‘rows’ of
> the input have the same length. (It may be assumed that the input
> of isPic is of type Canvas.) Examples:
> Cw2010> isPic (painting 3)
> True
> Cw2010> isPic (painting 4)
> False
> Suggestion. I found it useful in my implementation to define and use
> here the auxiliary function isEqual :: [Int] -> Bool; example:
> Cw2008> isEqual [8,8,8,8]
> True
> Cw2008> isEqual [8,8,4,8]
> False
> You may wish to define and use isEqual in your implementation of
> isPic too.
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