eiffelroom - beginner - Comments

Thanks Manu

DonTHB — Tue, 11 Sep 2007 11:22:02 -0700

Looks like some of my questions have been answered over at http://groups.eiffel.com.

Thanks again.

Best place is

manus_eiffel — Mon, 10 Sep 2007 10:35:00 -0700

For the moment, I believe it is best to subscribe to the Eiffel Software mailing list at http://groups.eiffel.com for such questions. The blog was not exactly designed for that purpose.

Porting the Eiffel runtime to a new platform is usually relatively easy assuming that your platform has a decent C compiler (i.e. ANSI C) and that the platform provides some of the basic API that you can find on most operating systems, i.e:

malloc, free for memory allocation
read/write/fopen/... for file/network access
other APIs that the runtime may need can also be excluded

Currently, Eiffel Software supports the VxWorks tool chain for embedded development. It has been successfully used on HPPA and PowerPC architecture.

The way we do it is that you develop on either your platform of choice with EiffelStudio. Then you take the C generated code and compile it for your target platform. Debugging is somewhat limited to C debugging but the generated code is following pretty closely your Eiffel code. If you can define some macros with your debugger then it makes it even easier.

Hope this helps, Manu

Typo?

colin-adams — Thu, 19 Apr 2007 22:49:43 -0700

Hello Jasmine,

Firstly, it would be easier to read your code if you included it within eiffel XML tags (see MediaWiki syntax when posting).

I can see a few problems with your code.

Firstly, it should be io.last_string (you omitted the io.). Secondly, I think you need to call io.last_string.twin, which will copy the last string. The problem is that io.last_string is re-used, so all the entries in your array point to the same object.

Thirdly, since you know the size of the array, it would be better to size it correctly, and use put, not force.

Also, avoid loops when you can (not always possible). Agents are better.

So something like this:

feature -- Test

test is

  -- Test reading multiple words from standard input

local

 my_array: ARRAY [STRING]

 i: INTEGER

do

 create my_array.make (1, 10)

 from

  i := 1

 until

  i > 10

 loop

  io.read_word

  my_array.put (io.last_string.twin, i)

  i := i + 1

 end

 my_array.do_all (agent print_line)

end

print_line (a_string: STRING) is

  -- Print `a_string' on standard output followed by a new line.

require

 a_string_not_void: a_string /= Void

do

 print (a_string + "%N")

end

Colin Adams