🍒 racket - Scheme - Blackjack Program (SICP) / Learning to program - Stack Overflow

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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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I have decided to learn to program reading/doing SICP. I'm using DrRacket and rating.bonusmoneygames.site I wrote a blackjack program.


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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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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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I have decided to learn to program reading/doing SICP. I'm using DrRacket and rating.bonusmoneygames.site I wrote a blackjack program.


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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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(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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Or perhaps i'm missing the point? Yes, with a cherry on top! The Racket implementation is straightforward: define adjacent-difference f lst if null? Thus this should work in the R7RS "red edition":! I'm not sure if this is the answer you want, but you can write append using primitives: define append l1 l2 cond null? How can I do this? Did I put too many comments? I am not sure how to translate this into scheme. Write tests! The key insight from this function is that fold is a very powerful operation, and should be part of any Schemer's toolkit. And, as seen in the code above, it's so simple to build from first principles! Add signatures and purpose statements to each of your functions. I'm not familiar with the Little Schemer primitives, so you may need to flavor this to suit. It's less complex than what an implementation needs to do to support syntax-rules or call-with-current-continuation. This should be enough to get you to a solution; I don't want to give away the final answer, though :. I think let would be my first choice for the local binding. Sometimes it rewrites the list then just calls flatten again. Per my understanding of tail recursion, the following function is not a tail recursive function. It works. Since cdr xs is the shorter than xs the loop ends when there is no more elements in cdr xs. Try using rackunit, documented here Let me focus on a single function show-deck. 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?

Home About Us Contact Us. I can cheat like this: map f append cdr lst ' 0 lst ; do not use the last element but it is a dirty solution. 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?

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 consreally would become tail recursive.

I will do the same and compare code. The call to generate the return should be the original function or a mutually tail recursive function like so define even? The "left-left lambda" pattern can be more difficult to read, as you note, so I prefer let.

Not sure if this is outside the rules or not : Here's an attempt. I have a version that uses only blackjack program in scheme operations and is efficient does not require more than one blackjack program in scheme through any of the lists, unlike append-based solutions.

In the map defined in SRFI-1 List library different sized lists are allowed with the requirement that at least one is finite.

That answer apparently wasn't long enough for Stack Exchange. I thought it would be easy but I haven't been able to come up with a solution.

Or do you always want to pull in default elements? Any ideas how to do it blackjack program in scheme writing a new function? 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'm also throwing down the gauntlet. Def not the most efficient way. In Exercise Are there situations where the lambda version would be preferred?

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. Can blackjack program in scheme make this program more Readable and succinct?

Is this tail recursive? In the case of add-to-each, you want to add a particular number to each element.

The first idea was: map f cdr lst lst Oops, the sizes of the lists are different, we cannot use map in this way.

Your lambda example uses a common pattern that simulates let using lambda and application: let [x e] body Blackjack program in scheme 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?

For a three-item list you should only have two differences, right? You should define your reduce as explicitly lazy, since the article is all about the importance and utility of laziness.

Not enough comments? Poker770 foldrbut let's define a paramorphism for generality: define para f z lst if null? Making it easier to read might be slightly less efficient, but we're talking about 52 read more here Here's one version that disentangles them: define show-deck1 first-list second-list define outer-loop first-list second-list cond null?

Common Lisp reduce is a general fold. How about making your own map? Thank you. 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.

Such an implementation could achieve blackjack program in scheme by transforming your code to something similar to the code below:! In Scheme you have fold-right that does elements in order. Tail recursion is when the recursive call is in the tail position. See here for an explanation. The key, then, is to pass map an f that does what you want to do to each element.

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The rest of this post assumes that's the case, and just takes out that incrementing. Avoid redefining built-in functions, like length. It will only step as many times as the shortest list. I see what it's doing, but the recursion can be simplified a bit. 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. Personally, if I'm writing in full Racket, I'd just code it with for loops. Yes, it's not tail recursive. The usual reduce is a right fold, i. How do I make this program "better"? Idiomatic usage of local vs lambda? Fixed code: define flatten x cond null? Can you make a program that uses "optimal" strategy and determines what the probability of the player winning against the dealer using n sample size? I can see that the target result can be made with: define doubleandcons lambda lst if null? Your u-reduce works just like a right fold with it's arguments in the same order. That prevents it from being tail recursive. Am I right? 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.