Re: LOGO-L> Numbers or Words?

[tlbelding@htcomp.net (Tony Belding)]

>> > make "a "1
>> > make "b 2
>> > show :a+:b
>> > And you'll get 3!

>> The above code you listed should generate a bug because you usually do
>> not want to mix datatypes unless you explicity tell it you want to.

So who is mixing datatypes?  Logo only has two datatypes: words and lists!
All the above are words.

>> It's
>> helping you to stay out of trouble. For example the code you wrote
>> above in many lauguages would give the ascii value of 1 plus 2 and the
>> answer would be "c :-).

Logo doesn't give you the ASCII value unless you ask for it.  Anyhow, "many
languages" do things in a way that is natural for computers, not for human
beings.  Logo tries to work more like people.


>Find all "happy" 6-digital (? sorry if the terminology isn't
>correct) integers. The integer is called "happy" if the sum of the
>first three digits is equal to the sum of the last three ones.

>My proposal for a solution:

>to happy
>ct
>for [i 100000 999999][if happy.test :i [pr :i]]
>end

>to happy.test :i
>localmake "s1 0
>localmake "s2 0
>repeat 3 [make "s1 :s1+remainder :i 10
>          make "i int :i/10]
>repeat 3 [make "s2 :s2+remainder :i 10
>          make "i int :i/10]
>op :s1=:s2
>end

That's about the way I would do it in C.  I think the nature of Logo
suggests a different approach, though.  Try this...

to happy.test :i
   op equalp (sum first :i first bf :i first bf bf :i) ~
             (sum last :i last bl :i last bl bl :i)
end


--
   Tony Belding
   http://hamilton.htcomp.net/tbelding/

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