range in ascii

range in ascii

[mieville]

Hi all, thanks for the message regarding packages, indeed this was the
problem.
Now I have another questions, I am reading from ada a .txt file and
counting the letters/word. But counting the letters I have declared my
subtype letters is Character range 'a' .. 'z', but I also want to count
upper case letters and other ASCII char.  How should I declare my range
of char.
Thanks for this help and apologies if my questions seems simple, easy
or obvious but I am starting w/ada.
Best, Sib

Re: range in ascii

[Peter Hermann]

mieville@mac.com wrote:
> counting the letters/word. But counting the letters I have declared my

kount : array(character) of natural := (others => 0);

mmmh?   ;-)

Re: range in ascii

[Martin Dowie]

mieville@mac.com wrote:
> Hi all, thanks for the message regarding packages, indeed this was the
> problem.
> Now I have another questions, I am reading from ada a .txt file and
> counting the letters/word. But counting the letters I have declared my
> subtype letters is Character range 'a' .. 'z', but I also want to count
> upper case letters and other ASCII char.  How should I declare my range
> of char.
> Thanks for this help and apologies if my questions seems simple, easy
> or obvious but I am starting w/ada.

So read a 'Character' and then decide what it is.

Cheers

-- Martin

Re: range in ascii

[mieville]

Hi all, I now have my code to count frequency of letters in a text but
I do not know how to read the command "enter" after I write my text.
What I have now is CTRL+Q but of course is not an elegant solution and
I know there is something easy but I cannot find it. Here below is my
code if someone could help me in that single question I would be
grateful. many thanks - sibyl

with Text_Io;
use Text_Io;

with Ada.Integer_Text_Io;
use Ada.Integer_Text_Io;

procedure Comptelettretest is

   Char , char2 : Character;
   cod: integer ;
   subtype Lettre is Integer range 20..255;
   type Freq_Lettre is array (Lettre) of Integer;
   Count : Freq_Lettre:= (others => 0);

begin

   Put_Line ("Entrer un text au choix et le terminer par 'CTRL/Q' et
'enter' ");
   loop
      Get(Char);

      --how to escape from this instruction, I want to hit enter and
have the list.
      exit when Char = ASCII.DC1;
      cod := CHARACTER'POS(CHAR);
      if cod in Lettre then
         Count(cod) := Count (cod) +1;
      end if;
   end loop;

New_Line;
   Put_Line("Frequence des lettres");
   New_Line;
   for cod in Lettre loop
      char2 := CHARACTER'VAL(cod);
      Put(char2);
      put(Count(cod));
      New_Line;
  end loop;
   
end Comptelettretest;

Re: range in ascii

[Anders Wirzenius]

mieville@mac.com writes:

> Hi all, I now have my code to count frequency of letters in a text but
> I do not know how to read the command "enter" after I write my text.
> What I have now is CTRL+Q but of course is not an elegant solution and
> I know there is something easy but I cannot find it. Here below is my
> code if someone could help me in that single question I would be
> grateful. many thanks - sibyl
> 
> with Text_Io;
> use Text_Io;
> 
> with Ada.Integer_Text_Io;
> use Ada.Integer_Text_Io;
> 
> procedure Comptelettretest is
> 
>    Char , char2 : Character;
>    cod: integer ;
>    subtype Lettre is Integer range 20..255;
>    type Freq_Lettre is array (Lettre) of Integer;
>    Count : Freq_Lettre:= (others => 0);
> 
> begin
> 
>    Put_Line ("Entrer un text au choix et le terminer par 'CTRL/Q' et
> 'enter' ");
>    loop

        Get_Immediate (Char);
        Put (Char);
        --  Get (Char)

>       Get(Char);
> 
>       --how to escape from this instruction, I want to hit enter and
> have the list.

        exit when Char = ASCII.CR;  --  Works at least on Windows


>       exit when Char = ASCII.DC1;
>       cod := CHARACTER'POS(CHAR);
>       if cod in Lettre then
>          Count(cod) := Count (cod) +1;
>       end if;
>    end loop;
> 
> New_Line;
>    Put_Line("Frequence des lettres");
>    New_Line;
>    for cod in Lettre loop
>       char2 := CHARACTER'VAL(cod);
>       Put(char2);
>       put(Count(cod));
>       New_Line;
>   end loop;
>    
> end Comptelettretest;

Anders

Re: range in ascii

[Alex R. Mosteo]

Anders Wirzenius wrote:
> mieville@mac.com writes:
> 
> 
>>Hi all, I now have my code to count frequency of letters in a text but
>>I do not know how to read the command "enter" after I write my text.
>>What I have now is CTRL+Q but of course is not an elegant solution and
>>I know there is something easy but I cannot find it. Here below is my
>>code if someone could help me in that single question I would be
>>grateful. many thanks - sibyl
>>
>>with Text_Io;
>>use Text_Io;
>>
>>with Ada.Integer_Text_Io;
>>use Ada.Integer_Text_Io;
>>
>>procedure Comptelettretest is
>>
>>   Char , char2 : Character;
>>   cod: integer ;
>>   subtype Lettre is Integer range 20..255;
>>   type Freq_Lettre is array (Lettre) of Integer;
>>   Count : Freq_Lettre:= (others => 0);
>>
>>begin
>>
>>   Put_Line ("Entrer un text au choix et le terminer par 'CTRL/Q' et
>>'enter' ");
>>   loop
> 
> 
>         Get_Immediate (Char);
>         Put (Char);
>         --  Get (Char)

Mmmmm, what about the old Get_Line? Isn't it just the thing to use for 
enter-finished inputs?

You'll get a string instead of a character, but iterating over its 
characters is just as easy.

> 
> 
>>      Get(Char);
>>
>>      --how to escape from this instruction, I want to hit enter and
>>have the list.
> 
> 
>         exit when Char = ASCII.CR;  --  Works at least on Windows
> 
> 
> 
>>      exit when Char = ASCII.DC1;
>>      cod := CHARACTER'POS(CHAR);
>>      if cod in Lettre then
>>         Count(cod) := Count (cod) +1;
>>      end if;
>>   end loop;
>>
>>New_Line;
>>   Put_Line("Frequence des lettres");
>>   New_Line;
>>   for cod in Lettre loop
>>      char2 := CHARACTER'VAL(cod);
>>      Put(char2);
>>      put(Count(cod));
>>      New_Line;
>>  end loop;
>>   
>>end Comptelettretest;
> 
> 
> Anders

Re: range in ascii

[Jeffrey Carter]

mieville@mac.com wrote:

>    type Freq_Lettre is array (Lettre) of Integer;

Integer allows negative values, so I guess negative frequencies are 
meaningful? If not, perhaps you should use Natural.

Why not use

    subtype Lettre is Character range 'x' ... 'z'; -- or whatever

and avoid the conversions between Characters and Integers?

>    Put_Line ("Entrer un text au choix et le terminer par 'CTRL/Q' et
> 'enter' ");

      Read_Input : declare
         Line : constant String := PragmARC.Get_Line;
      begin
         All_Chars : for I in Line'range loop
            if Line (I) in Lettre then
               Count (Line (I) ) := Count (Line (I) ) + 1;
            end if;
         end loop All_Chars;
      end Read_Input;

The PragmAda Reusable Components are available from

http://home.earthlink.net/~jrcarter010/pragmarc.htm

-- 
Jeff Carter
"I unclog my nose towards you."
Monty Python & the Holy Grail
11