💰 Scheme - Blackjack Program (SICP) / Learning to program - scheme

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(define (code-to-english-letter letter match-list) (car (rassoc letter match-list))) ​2 Exercises Write a program that determines the value of a BlackJack hand.


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blackjack program in scheme

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On the contrary, blackjack requires Player decisions that have a great influence Thorp proposed a specific scanning scheme, or count, which he claimed could Thorp had also written a program for electronic computer that improved on the.


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blackjack program in scheme

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One direction where we can take our programming skills is game development. Here, we'll build a text based Blackjack engine that allows us to play against a.


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Mel's job was to re-write the blackjack program for the RPC (Port? What does that mean?) The new computer had a one-plus-one addressing scheme.


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(define (code-to-english-letter letter match-list) (car (rassoc letter match-list))) ​2 Exercises Write a program that determines the value of a BlackJack hand.


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Mel's job was to re-write the blackjack program for the RPC (Port? What does that mean?) The new computer had a one-plus-one addressing scheme.


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I have decided to learn to program reading/doing SICP. I'm using DrRacket and big-pizza-eao.ru I wrote a blackjack program.


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they enter advertising orders for business clients into a software program. It was quite an ingenious scheme, actually, having to do with changing the codes.


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Network Universal Frame Forge, A Scheme-based programming environment designed for Hoyte BlackJack Labs, Analysis of the casino game of BlackJack.


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Mel's job was to re-write the blackjack program for the RPC (Port? What does that mean?) The new computer had a one-plus-one addressing scheme.


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blackjack program in scheme

Idiomatic usage of local vs lambda? I think let would be my first choice for the local binding. And, as seen in the code above, it's so simple to build from first principles! Thank you. Write tests! The first idea was: map f cdr lst lst Oops, the sizes of the lists are different, we cannot use map in this way. Personally, if I'm writing in full Racket, I'd just code it with for loops. How about making your own map? That of course doesn't deny anyone from actually implementing TRMCO in their Scheme implementation so that your definition of map, which is almost tail recursive except for that cons , really would become tail recursive. Try using rackunit, documented here Let me focus on a single function show-deck. I can see that the target result can be made with: define doubleandcons lambda lst if null? In the case of add-to-each, you want to add a particular number to each element. It will only step as many times as the shortest list. Not enough comments? In the map defined in SRFI-1 List library different sized lists are allowed with the requirement that at least one is finite. That prevents it from being tail recursive. Such an implementation could achieve this by transforming your code to something similar to the code below:! Thus this should work in the R7RS "red edition":! The "left-left lambda" pattern can be more difficult to read, as you note, so I prefer let. Add signatures and purpose statements to each of your functions. First off, I think you might be getting relativeabsolute confused with add-to-each, since add-to-each just adds the same number to each element of the list, rather than incrementing an accumulator. Sometimes it rewrites the list then just calls flatten again. How can I do this? The Racket implementation is straightforward: define adjacent-difference f lst if null? Your u-reduce works just like a right fold with it's arguments in the same order. See here for an explanation. Your lambda example uses a common pattern that simulates let using lambda and application: let [x e] body Is equivalent to: lambda x body e If you use this transformation from lambda to let in your example, you get: define add-to-each5 n a-list cond [ empty? Fixed code: define flatten x cond null? However, Exercise Let's look at a simple definition of map to see how it might be helpful, rather than painful, for this problem: define map f ls cond [ empty? The first higher order function he defines is reduce, which i've defined in Scheme as follows: define u-reduce lambda ff init lst if null? Or perhaps i'm missing the point? The key insight from this function is that fold is a very powerful operation, and should be part of any Schemer's toolkit. This should be enough to get you to a solution; I don't want to give away the final answer, though :. The key, then, is to pass map an f that does what you want to do to each element. Am I right? L ' cons f car L map f cdr L cons will have to wait until map f cdr L returns to finish its job. I see what it's doing, but the recursion can be simplified a bit. Def not the most efficient way. It is safe to assume that it is not tail recursive since the standard RNRS, including the latest R7RS doesn't require tail recursion modulo cons optimization. It works. How do I make this program "better"? Yes, with a cherry on top! Can you make this program more Readable and succinct? I have a version that uses only "first-principles" operations and is efficient does not require more than one pass through any of the lists, unlike append-based solutions. I thought it would be easy but I haven't been able to come up with a solution. Making it easier to read might be slightly less efficient, but we're talking about 52 cards here Here's one version that disentangles them: define show-deck1 first-list second-list define outer-loop first-list second-list cond null? I can cheat like this: map f append cdr lst ' 0 lst ; do not use the last element but it is a dirty solution.

Home About Us Contact Us. I'm not familiar with the Little Schemer primitives, so you may need to flavor this to suit. The call to generate the return should be the original function or a mutually tail recursive function like so define even?

It's less complex than what an implementation needs to do to support syntax-rules or call-with-current-continuation. Haskell's foldrbut let's define a paramorphism for generality: define para f z lst if null?

That answer apparently wasn't long enough for Stack Exchange. I will do the same and compare code. Any ideas how to blackjack program in scheme it without blackjack program in scheme a new function? We can take map one step further, and use it for both the inner and outer loopings, and use apply append One way to avoid the apply append It relegates the loopness to foldr, though, so that all those iter functions disappear into uses of foldr.

The usual reduce is a right fold, i. Avoid redefining built-in should you split 6s in blackjack, like length.

Or do you always want to pull in default elements? Not sure if this is outside the rules or not : Here's blackjack program in scheme attempt. For a three-item list you should only have two differences, right? Can you make a program that uses "optimal" strategy and determines what the probability of the player winning against the blackjack program in scheme using n sample size?

Did I put too many comments? Categories HOME msbuild rebus python Resources javascript android java csharp blackjack program in scheme python ios click here html sql.

I'm not sure if this is the answer you want, but you can write append using primitives: define append l1 l2 cond null? Per my understanding of tail recursion, the following function is not a tail recursive function. I'm also throwing down the gauntlet. Tail recursion is when the recursive call is in the tail position. Since cdr xs is the shorter than xs the loop ends when there is no more elements in cdr xs. In Scheme you have fold-right that does elements in order. It gets away with using cons and avoiding append, because it only chips away the first non-pair it can get to and conses that to the flatten of a new tail it has built. In Exercise Are there situations where the lambda version would be preferred? Is this tail recursive? Common Lisp reduce is a general fold. You should define your reduce as explicitly lazy, since the article is all about the importance and utility of laziness. I am not sure how to translate this into scheme. Yes, it's not tail recursive. The rest of this post assumes that's the case, and just takes out that incrementing.