Forum: Ruby fixnum problem plz help

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Guy D. (Guest)
on 2009-03-03 23:30
hy

i am new to ruby i am trieng to get some skils but i have a problem when
i use a fixnum :

years = ask("")
days = years * 365
puts days


my answer is
222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222

but i should be 730

i have an screenshot  as an attachment plz help me
Dominik H. (Guest)
on 2009-03-03 23:34
(Received via mailing list)
On [Wed, 04.03.2009 06:28], Guy D. wrote:
> my answer is
> 
222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
>
> but i should be 730
>
> i have an screenshot  as an attachment plz help me
Thats the character "2" (not the number) repeated 365 times. you
probably want years = ask("").to_i
Michael M. (Guest)
on 2009-03-03 23:36
(Received via mailing list)
Guy D. wrote:
> my answer is
> 
222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
>
> but i should be 730
>
> i have an screenshot  as an attachment plz help me
>
Please paste your ask() Method.  That appears to be where the problem
is.

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Pascal J. Bourguignon (Guest)
on 2009-03-03 23:45
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Guy D. <removed_email_address@domain.invalid> writes:

> my answer is
> 
222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
>
> but i should be 730


I think you are lying. Twice.

First, the answer is probably not what you're telling but rather:

22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222

Then it should NOT be 730, but what you get.

This is because for all we know, ask("") is returning "2" and 365
times "2" is a string containing 365 2s.  At least in such a inferior
language as Ruby.



In more strongly typed programming languages such as Common Lisp,
you'd get an error:

C/USER[929]> (* "2" 365)

*** - *: "2" is not a number



> i have an screenshot  as an attachment plz help me

Good for you!
Michael M. (Guest)
on 2009-03-03 23:52
(Received via mailing list)
Pascal J. Bourguignon wrote:
>> puts days
>
>
Unsuccessful troll is unsuccessful.
>
>> i have an screenshot  as an attachment plz help me
>>
>
> Good for you!
>
>
>


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addressee.  It is subject to copyright, is confidential and may be
the subject of legal or other privilege, none of which is waived or
lost by reason of this transmission.
If the receiver is not the intended addressee, please accept our
apologies, notify us by return, delete all copies and perform no
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Ken B. (Guest)
on 2009-03-04 01:14
(Received via mailing list)
On Tue, 03 Mar 2009 16:28:48 -0500, Guy D. wrote:

> my answer is
>
222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
>
> but i should be 730
>
> i have an screenshot  as an attachment plz help me

Ask is returning the string "2" instead of the number 2.
When you use the multiplication operator on a string, it creates a
longer
string with that many copies of the string concatenated back to back, so
instead of multiplying the number 2 by 365 to give 730, you got a string
containing exactly 365 twos.

years=ask("").to_i

--Ken
Tom C. (Guest)
on 2009-03-04 02:21
(Received via mailing list)
Pascal J. Bourguignon wrote:
>> puts days
>
>
>
>> i have an screenshot  as an attachment plz help me
>>
>
> Good for you!
>
>
>
And for the benefits, such as they are, of strong typing, we get to a
whole other level of detail to attend to. No thanks. Did that for a time
with Pascal. I prefer the mindless grace of waterfowl.

t.

--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Bellingham, Washington, U.S.A: (360) 920-1226
<< removed_email_address@domain.invalid >> (email)
<< TomCloyd.com >> (website)
<< sleightmind.wordpress.com >> (mental health weblog)
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William J. (Guest)
on 2009-03-04 10:05
(Received via mailing list)
Pascal J. Bourguignon wrote:

> This is because for all we know, ask("") is returning "2" and 365
> times "2" is a string containing 365 2s.  At least in such a inferior
> language as Ruby.
>
>
>
> In more strongly typed programming languages such as Common Lisp,

Typo.  Should be Commune Lisp.

> you'd get an error:
>
> C/USER[929]> (* "2" 365)
>
> *** - *: "2" is not a number

Commune Lisp:
  (* "2" 9)
  *** ERROR!!! ***

Awk:
  "2" * 9
  18

Ruby:
  "2" * 9
  "222222222"

Now, which is the lowest-level language?
Brian C. (Guest)
on 2009-03-04 11:00
Pascal J. Bourguignon wrote:
> In more strongly typed programming languages such as Common Lisp,
> you'd get an error:
>
> C/USER[929]> (* "2" 365)
>
> *** - *: "2" is not a number

This is nothing to do with "strongly typed". Ruby's concept of the
difference between a string and an integer is just as strict as LISP's.

Rather, Ruby provides semantics to the '*' operator/function for strings
which LISP doesn't.

You can get exactly the behaviour you desire by _removing_ some Ruby
functionality.

irb(main):001:0> String.class_eval { undef_method(:*) }
=> String
irb(main):002:0> "2" * 365
NoMethodError: undefined method `*' for "2":String
  from (irb):2
  from :0
Pascal J. Bourguignon (Guest)
on 2009-03-04 11:50
(Received via mailing list)
Brian C. <removed_email_address@domain.invalid> writes:

>
>   from (irb):2
>   from :0

Right, it is too much overloading, not weak typing.  Sorry for the
confusion.
Thomas P. (Guest)
on 2009-03-04 15:07
(Received via mailing list)
2009/3/4 William J. <removed_email_address@domain.invalid>:
> Typo.  Should be Commune Lisp.
>
> Awk:
>  "2" * 9
>  18
>
> Ruby:
>  "2" * 9
>  "222222222"

C:
printf("%d\n",'2'*9);
450
Yossef M. (Guest)
on 2009-03-04 19:53
(Received via mailing list)
On Mar 3, 3:49 pm, Michael M. <removed_email_address@domain.invalid> wrote:
> Unsuccessful troll is unsuccessful.

I had to re-read the post to be sure it actually came from Pascal.
After all, there were no nested parens in the entire thing.
Robert D. (Guest)
on 2009-03-05 23:24
(Received via mailing list)
On Tue, Mar 3, 2009 at 10:43 PM, Pascal J. Bourguignon
<removed_email_address@domain.invalid> wrote:
> language as Ruby.
> In more strongly typed programming languages such as Common Lisp,
What?? There are other languages than CL??? You must be kidding? I
warn you I might report you to the CL-ML.
Some things are just too serious to joke with!!

And BTW, seems you posted this by error to ruby talk, well I'm sure
that was just a stupid mistake you will take of correcting very soon.

Thank you in advance.

Cheers
Robert
Robert D. (Guest)
on 2009-03-05 23:26
(Received via mailing list)
On Wed, Mar 4, 2009 at 6:51 PM, Yossef M. <removed_email_address@domain.invalid>
wrote:
> On Mar 3, 3:49 pm, Michael M. <removed_email_address@domain.invalid> wrote:
>> Unsuccessful troll is unsuccessful.
>
> I had to re-read the post to be sure it actually came from Pascal.
> After all, there were no nested parens in the entire thing.

But the nested parens occur in Lisp, right, Pascal is the thing with
":=" or am I confused here? (Maybe I should go to Delphi to seek some
guidance)

R.
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