— CPSC 312 – 2019 – Lists in Haskell module Lists3 where — To run it, try: — ghci — :load Lists3 — sum [a1,a2,..an] = a1+a2+…+an mysum [] = 0 mysum (h:r) = h + mysum r — product [a1,a2,..an] = a1*a2*…*an myproduct [] = 1 myproduct (h:r) = h * myproduct r — […]
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Quotation for the day … “computer science” is not a science and .. its significance has little to do with computers. The computer revolution is a revolution in the way we think and in the way we express what we think. — Harold Abelson and Gerald Jay Sussman, “Structure and Interpretation of Computer Programs”, 1985
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CPSC 312 — Functional and Logic Programming Assignment 5 is available Midterm #3 next week — more details on web site soon “Contrariwise,” continued Tweedledee, “if it was so, it might be; and if it were so, it would be; but as it isn’t, it ain’t. That’s logic.” – Lewis Carroll, Through the Looking-Glass CPSC
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— Solution to Midterm #1 2019 — (Or the Haskell to generate the solution) module Mid12019 where — Question 1 dw _ [] = [] dw p (h:t) | p h = dw p t | otherwise = (h:t) — dw (>2) [7,3,1,4,1,2,1] — dw (/= ‘ ‘) “CS312? Real fun?” — Question 2 —
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— CPSC 312 – 2021 – Games in Haskell module MagicSum where — To run it, try: — ghci — :load MagicSum data State = State InternalState [Action] — internal_state available_actions deriving (Ord, Eq, Show) data Result = EndOfGame Double State — end of game: value, starting state | ContinueGame State — continue with new
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— CPSC 312 – 2021 – Games in Haskell —– Same as Magic_sum except that the state has ordered lists module MagicSum_ord where — To run it, try: — ghci — :load MagicSum_ord data State = State InternalState [Action] — internal_state available_actions deriving (Ord, Eq, Show) data Result = EndOfGame Double State — end of
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— CPSC 312 2021 – Final Exam Practice Questions — Solutions that relate to Haskell — Question 5 — del1 e lst — returns a list with one instance of e removed from list lst — need to make a choice of what happens if e is not in lst — it could —- return
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Thought for the day “…there are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies and the other way is to make it so complicated there are no obvious deficiencies. The first method is far more difficult.” — Tony Hoare, 1980 ACM Turing
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Announcements Project proposals due by end of this week “Pascal [Java] is for building pyramids …. Lisp [Haskell] is for building organisms – …. The organizing principles used are the same in both cases, except for one extraordinarily important difference: The discretionary exportable functionality entrusted to the individual Lisp programmer is more than an order
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Some Haskell Classes and Types Bool (&&, ||, not) Num (+, −, ∗, abs) Integral (div, mod) Int Integer Fractional (/) Floating (log, sin, exp, …) Double Eq (==, /=) Ord (>, >=, y = x | otherwise = y It evaluates the guards; the first one succeeding, the corresponding expression is returned CPSC 312
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