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Date: Thu, 8 Aug 2002 19:55:26 +0200
From: Nicolas FRANCOIS (AKA El Bofo) <nicolas.francois@free.fr>
To: Caml List <caml-list@inria.fr>
Subject: [Caml-list] Some troubles with stdout
Message-Id: <20020808195526.6fe14fce.nicolas.francois@free.fr>
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This is a Matrice.print function that doesn't give me what I expect from
it :

  let print m =
    for i = 0 to D.lignes - 1 do
      print_string "(  ";
      for j = 0 to D.colonnes - 1 do
	A.print m.(i).(j);
	flush stdout;
	print_string "  "
      done;
      flush stdout;
      print_string ")";
      print_newline ()
    done;
    print_newline ()
      
m is of type A.elem array array (it's a matrix), and using it with 

A.elem = Num.num

and 

A.print n = print_string (string_of_big_int n)

i get this answer :

# let m = Matrice_Z.parse
    (Stream.of_string
       "[[ 3, 4, -2, 1, -2],[ 1, -1, 2, 2, 7],[ 4, -3, 4, -3, 2],[ -1, 1,
6, -1, 1]]");;
    val m : Matrice_Z.elem =
  [|[|<abstr>; <abstr>; <abstr>; <abstr>; <abstr>|];
    [|<abstr>; <abstr>; <abstr>; <abstr>; <abstr>|];
    [|<abstr>; <abstr>; <abstr>; <abstr>; <abstr>|];
    [|<abstr>; <abstr>; <abstr>; <abstr>; <abstr>|]|]

# Matrice_Z.print m;;
(            )
(            )
(            )
(            )

34-21-21-12274-34-32-116-11- : unit = ()
# 

instead of the wanted :

( 3 4 -2 1 -2 )
( 1 -1 2 2 7 )
( 4 -3 4 -3 2 )
( -1 1 6 -1 1 )

(which, I agree with you, is far from perfect).

Where do I get it wrong with stdout channel ? What's the exact purpose of
flush, and why does the outputs get mixed ?

\bye

-- 

                   Nicolas FRANCOIS
            http://nicolas.francois.free.fr
 A TRUE Klingon programmer does NOT comment his code
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