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chrisbrown

Wed Mar 03, 2010 5:44 pm


You think you can Turing?

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proc map (fcn f (x : real) : real, var arr : array 0 .. * of real)
    for i : 0 .. upper (arr)
        arr (i) := f (arr (i))
    end for
end map

fcn square (x : real) : real
    result x ** 2
end square

fcn random (x : real) : real
    result Rand.Real ()
end random

proc print (a : array 0 .. * of real)
    for i : 0 .. upper (a)
        put a (i), " " ..
    end for
    put ""
end print

var a : array 0 .. * of real := init (0, 1, 2, 3, 4, 5);
print (a)

map (square, a)
print (a)

map (random, a)
print (a)

% Sadly, this does not work
% map (sin, a)


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DemonWasp

Wed Mar 03, 2010 6:35 pm


RE:You think you can Turing?

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Very clever.

Interestingly, if you alias sin as another method, for example sine, it works fine. I wonder why Turing won't let you pass built-in methods around, but will let you pass around your own methods.


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TheGuardian001

Wed Mar 03, 2010 7:03 pm


Re: You think you can Turing?

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That is pretty weird... I can't see any reason why it wouldn't let you pass a built in function... Wonder if it only opposes the trig commands, or all built in functions...


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DtY

Wed Mar 03, 2010 9:07 pm


Re: RE:You think you can Turing?

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Very clever.

Interestingly, if you alias sin as another method, for example sine, it works fine. I wonder why Turing won't let you pass built-in methods around, but will let you pass around your own methods.Probably something to make the language easier to implement.


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DemonWasp

Wed Mar 03, 2010 9:14 pm


RE:You think you can Turing?

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Ah, laziness, my constant foe.


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chrisbrown

Wed Mar 03, 2010 9:34 pm


RE:You think you can Turing?

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If you look at the source, all the builtins are external functions, probably written in C++... Turing's creators didn't even want to use their own language!

Side note: haven't touched Turing in 3 years; after learning other languages, you really notice the flaws in this one.


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DemonWasp

Wed Mar 03, 2010 9:47 pm


RE:You think you can Turing?

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This holds true in all languages - after going somewhere else, you notice the flaws in your old favourites.

Some languages have their faults more apparent up-front, however.


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[Gandalf]

Thu Mar 04, 2010 2:02 am


RE:You think you can Turing?

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On the other hand, after exploring other languages you begin to understand why Turing was designed the way it was, and why many of its shortcomings exist.