Hello LB!

Answering a message from 01.04.97 04.29.06 from LB to All:

 L> From: l...@ix.netcom.com (LB)

 L> Hi , I`m a correspondence CS student and I need to write a program
 L> which reads integers out of a txt file using the "Val" function. My
 L> problem is that my books don`t give me any detail about standard
 L> functions.  Could anybody post a brief explanation about  how and what
 L> this function does?                Thanks in advance. LB

My Borland-Pascal 7.0 Online Help ( German version ) says :

val   :

 Val (Prozedur)
 ###############
Interpretiert einen String als numerischen
Wert.

 Deklaration:
 procedure Val(S; var V; var Code: Integer);
 Es gilt:
  S          ist eine Variable des Typs String, die eine Zeichenfolge
             speichert, die einen numerischen Wert (mit Vorzeichen) ergibt.
  V          ist eine Variable mit einem Integer- oder Real-Typ.
  Code       ist eine Variable des Typs Integer.

 Zielsystem:
Windows, Real, Protected

 Bemerkungen:
Konvertiert den Wert des String (S) in seine
numerische Entsprechung, so als ob dieser
String mittels Read aus einer Textdatei
gelesen wuerde.

 Siehe auch:
  Str

 Beispielprogramm:

   {Val.PAS}

  {Beispielcode fuer die Prozedur Val }

  var I, Code: Integer;
  begin
  { Get text from command line }
    Val(ParamStr(1), I, Code);
    { Error during cnversion to integer? }
    if code <> 0 then
      Writeln('Error at positon: ', Code)
    else
      Writeln('Value = ', I);
  end.

     thanks again for your time.

LB <l...@ix.netcom.com> wrote in article
<334052d9.4104...@news.supernews.com>...

 Declaration:  procedure Val(S; var V; var Code: Integer);
  S     string-type variable
  V     integer-type or real-type variable
  Code  variable of type Integer.

Converts the string value (S) to its numeric representation, as if it were
read from a text file with Read.

  The use of Val procedure is:
        " Val(s,n,error) "
   where:
        s is a string when you obtain your number as a string.
        n is the integer or real number you want to convert to a string.
        error is one integer where the procedure reports you  the possible
errors in operation. If error is 0 the operation is ok.

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