The Big Programming Thread - Page 531

On October 18 2014 04:49 FFGenerations wrote:
any of you guys use a saddle style chair?

this looks like the affordable UK website (150-165)

what the fuck is up with this website design tho? who makes a website like this??
http://www.beautelle.co.uk/company/

direct link http://www.beautelle.co.uk/water/ergonomic posture saddle stools.htm

maybe this one is better
http://www.tronus.eu/en/saddlestool-standard.html?id=8538440

On October 18 2014 12:09 Birdie wrote:
Homework question for Haskell. I'm trying to take a list and return a new list of every value which is not the same as the next value, e.g. notEqual [1,1,2,3,4,4,5,6] returns [1,2,3,4,5,6]. The trick is I have to do it only using list comprehension and inbuilt library functions. I can do it using recursion easily enough but I guess I don't understand list comprehension well enough to know how to do it.

On October 18 2014 21:02 MinoMoto wrote:
Guys i need help again
I need to create program using "do...while" in C#
1 program is asking you to enter a number(how much times it will do match)
2 program is asking you to enter a number, what will sum with previously entered sum.

int iteration = 0;
int maxIterations;
int sum = 0;
int inputValue;

maxIterations := <take value>

do 
    inputValue := <take value>
    Print Sum[iteration]=sum+inputValue
    sum += inputValue
    ++iteration
while iteration < maxIterations

Print Sum[iteration]=sum

On October 19 2014 00:51 Nesserev wrote:


Well, only problem with using a do-while loop in this case is that you only check for the amount of iterations after asking for the first value. So, when the user wants zero iterations, he/she still has to give input; it won't work as intended, it's semantically incorrect.

On October 18 2014 20:04 Nesserev wrote:

notEqual :: Eq a => [ a ]  -> [ a ]
notEqual []					= []
notEqual (x:xs)	| xs == []		= [ x ]
				| x /= next  	= [ x ] ++ notEqual(xs)
                    		| x == next  	= notEqual(xs)
                    		where
                    		{ 	next = head(xs)
                    		}

- Use the (x:xs) notation to split head and tail (just like prolog).
- There's a wide range of list functions that are really nice, like head(), tail(), etc.
- '++' operator is used for appending lists

The first case is to handle empty lists, the second case has three more subcases:
- deal with last number (when tail is an empty list)
- when head != next number
- when head == next number

On October 19 2014 04:59 Birdie wrote:

I'm trying to do it without recursion, only using list comprehension and built in functions. I've already done it using recursion.

On October 19 2014 05:13 Liebig wrote:

notEqual l = concat $ map head $ group l

?

On October 19 2014 05:26 Birdie wrote:

I could be wrong but does that actually remove anything from the list?

On October 19 2014 05:44 Liebig wrote:

Made a mistake.

notEqual = map head . group

λ map head $ group [1,1,2,3,4,4,5,6]
[1,2,3,4,5,6]

Basically, it just groups consecutive things that are equal, then you just take the first element of each new list and it makes the new list.

On October 19 2014 08:05 delHospital wrote:
If you really want to use list comprehensions, you could do something like

notEqual [] = []
notEqual (x:xs) = x : [cur | (prev, cur) <- zip (x:xs) xs, prev /= cur]

This walks through two copies of the same list, but one of them (xs) is always one step ahead of the other (x:xs). It yields an element every time the heads of these lists differ.

On October 19 2014 00:47 goody153 wrote:
Hello Sir's,

Me and my friends are planning to put some kind of website that has a drawing app inbound. And i am planning to code a drawing application for the website.

I did some googling and there are i found the HTML canvass + Javascript is an easy way to code such tool.

However i am not sure if this is enough for the long run since we may want to build a more powerful and flexible drawing app than our current plans.

Is there any language, library or framework or something that i should know that is for this certain task drawing webapp and should work better than the html5 + javascript ?

Thanks ..

my current knowledge for web development are html, css, js , php and mysql. I'm also not an expert of those.