# Convert octal to decimal

How do i convert a octal number to decimal?
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Commented:
This is a unit with an example of a procedure which could help

Ad to edit-compnents and one button to a form :

Here's the code :

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;

type
TForm1 = class(TForm)
Edit1: TEdit;
Edit2: TEdit;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{\$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
octal : string;
decimalstring : string;
decimal : longint;
i : integer;
tempnumber : string[1];
lngth : longint;
mult : longint;
begin
octal:=edit1.text;
lngth := length(octal);
mult:=1;
decimal:=1;
for i:=1 to lngth-1 do
mult:=mult*8;
for i:=1 to lngth do
begin
tempnumber:=copy(octal,i,1);
decimal:=decimal+(strtoint(tempnumber)*mult);
mult:=trunc(mult/8);
end;
decimal:=decimal-1;
decimalstring:=inttostr(decimal);
edit2.text:=decimalstring;

end;

end.

Regards
Batalf
0
Commented:
This is a unit with an example of a procedure which could help

Ad to edit-compnents and one button to a form :

Here's the code :

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;

type
TForm1 = class(TForm)
Edit1: TEdit;
Edit2: TEdit;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{\$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
octal : string;
decimalstring : string;
decimal : longint;
i : integer;
tempnumber : string[1];
lngth : longint;
mult : longint;
begin
octal:=edit1.text;
lngth := length(octal);
mult:=1;
decimal:=1;
for i:=1 to lngth-1 do
mult:=mult*8;
for i:=1 to lngth do
begin
tempnumber:=copy(octal,i,1);
decimal:=decimal+(strtoint(tempnumber)*mult);
mult:=trunc(mult/8);
end;
decimal:=decimal-1;
decimalstring:=inttostr(decimal);
edit2.text:=decimalstring;

end;

end.

Regards
Batalf
0
Commented:
I don't know any function in Delphi for converting of Octal to Decimals. Maybe a procedure like above could help you.
0

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Author Commented:
thanks man
0
Author Commented:
How do I convert the integer back to octal?
0
Commented:
Hi

Give me some time and I would give you the source code for this, that means extend the program above to also include conversion from octal to numbers.

It a little bit more complex than converting octal numbers to decimals :

As far as I know each digit must be diverted by 8, and we spare the reminders :

ex : decimal 174

174 /8 = 21(dec. deleted), 21 times 8 = 168, 174-168 = 6
21/8 = 2(dec. deleted), 2 times 8 = 16, 21-16 = 5
2/8 = 0, 0 times 8 = 0, 2-0 = 2

The reminders was 2, 5 and 6 = octal number 256

Well, I get back to you

Regards
BATALF

0
Commented:
Hi I have the code here :
I think you could add a new button to your existing form with caption (Dec2Oct) or something like that

I would appreciate if you would offer me some points for this code. (ex : post a question with subject xxx points to Batalf). Do what you feel like :-)

Well, here's the code, I have tested that it's working :

procedure TForm1.Button1Click(Sender: TObject);
type
remindertype = array[1..10] of byte;
var
octal : string;
decimalstring : string;
reminder:remindertype;

rest : integer;
tempno : integer;
remno : integer;
divid : integer;

begin
decimalstring:=edit1.text;
lngth:=length(decimalstring); {counts numbers of digits in octal number}

remno:=1;
rest:=strtoint(decimalstring);
REPEAT
divid := trunc(rest/8);
tempno := divid*8;
reminder[remno] := rest - tempno;
rest := divid;
inc(remno);
UNTIL REST=0;
dec(remno);
decimalstring:='';
repeat
decimalstring:=decimalstring+inttostr(reminder[remno]);
dec(remno);
until remno=0;
edit2.text:=decimalstring;
end;

Best Regards
Batalf
0
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