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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Word counting
References: <vSvCb.379036$ao4.1266025@attbi_s51>
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Xref: archiver1.google.com comp.lang.ada:3433
Date: 2003-12-13T06:09:28+00:00
List-Id: <comp.lang.ada>

You need to read in a line.
You want to scan the line, including just off both ends,
looking for word/non-word transitions.
On the non-word => word transitions, you want to note the start of the word.
On the word => non-word transitions, you want to see how long it's been
since the last non-word => word transition,
and increment a counter for that length.

--You need to read in a line.
  Line : String(1 .. 80);
  Last : Natural;
  --You want to scan the line, including just off both ends,
  --looking for word/non-word transitions.
  Currently_In_Word: Boolean;
  --On the non-word => word transitions, you want to note the start of the word.
  Start_Index: Positive;
  --On the word => non-word transitions, you want to see how long it's been
  --since the last non-word => word transition,
  Length  : Integer range Line'range;
  --and increment a counter for that length.
  Counter : array (Line'range) of Natural := (others => 0);
begin
  while not Ada.Text_Io.End_Of_File loop
    --You need to read in a line.
    Ada.Text_Io.Get_Line(Line, Last);
    Currently_In_Word := False;
    --You want to scan the line
    for I in 0 .. Last + 1 loop
      --looking for word/non-word transitions.
      if (I in 1 .. Last and then Line(I) /= ' ') then
        if not Currently_In_Word then
          --On the non-word => word transitions,
          Currently_In_Word := True;
          --you want to note the start of the word.
          Start_Index := I;
        end if;
      else
        if Currently_In_Word then
          --On the word => non-word transitions,
          Currently_In_Word := False;
          --you want to see how long it's been since the last non-word => word
          --transition,
          Length := I - Start_Index;
          --and increment a counter for that length.
          Counter(Length) := Counter(Length) + 1;
        end if;
      end if;
    end loop;
  end loop;