From: chrissy_brady1@yahoo.com (chrissy)
Subject: Re: Octal Conversion in VB
Date: 7 Sep 2003 19:46:54 -0700
Date: 2003-09-08T02:46:55+00:00 [thread overview]
Message-ID: <f8f1b420.0309071846.3f2d1bb3@posting.google.com> (raw)
In-Reply-To: 3F5B91AA.4040203@attbi.com
"Robert I. Eachus" <rieachus@attbi.com> wrote in message news:<3F5B91AA.4040203@attbi.com>...
> Ludovic Brenta wrote:
>
> > Here is a general algorithm that does what you want. Note that you
> > need some mathematical background to understand why there are
> > log(N)/log(8) octal digits in any integer number.
>
> I think chrissy was actually looking to convert (ASCII?) characters into
> octal triplets. Something more like what follows.
I actually wanted to produce a string of alphanumerics representing
the integer value of a Base 10 integer, converted to Base 8. Thus the
ASCII string entered to a text box in VB "94" ultimately returns the
string "136".
Thanks so much for the suggestion. It's ingenious, but I'm stuck with
VB for the moment. Another friend suggested the following for VB:
Dim DecimalStr As String
Dim OctalStr As String
Dim HexadecimalStr As String
DecimalStr = InputBox ("Enter decimal value")
OctalStr = Oct$(DecimalStr)
HexadecimalStr = Hex$(DecimalStr)
MsgBox (OctalStr)
MsgBox (HexadecimalStr)
As a safety mechanism to avoid problems with null values, you could
use these lines instead of the corresponding ones above:
OctalStr = Oct$(DecimalStr & " ")
HexadecimalStr = Hex$(DecimalStr & " ")
This of course does much more than I'd asked, as it's handling
hexadecimals as well.
The same friend also offered me a solution in Pascal:
I've attached a generic base conversion program in Pascal for bases
from 2 to 36 but there's no error handling. These are fairly standard
algorithms. The programing term is 'cliches'. It converts from any
base to any base.
Louie.
-----------------------------------------------------------------------------
Tabs set to 4 spaces
{
baseconvert.pas - Base convertor of integers
Luis Esteban 8 September 2003
Created without error checking
}
program BaseConvertor (input, output);
var
InputNumber : string;
OutputNumber : string;
InputBase : integer;
OutputBase : integer;
Value : longint;
function StringToInteger (Number : string; Base : integer) : longint;
var
Accumulator : longint;
i : integer;
begin
Accumulator := 0;
for i := 1 to Length(Number) do
begin
{writeln ('Number[', i:1, '] = ', Number[i]);}
if Number[i] in ['0'..'9'] then
begin
Accumulator := Accumulator * Base +
(ord(Number[i]) - ord('0'));
end
else
if Number[i] in ['A'..'Z'] then
begin
Accumulator := Accumulator * Base + (10 +
ord(Number[i]) - ord('A'));
end
else
if Number[i] in ['a'..'z'] then
begin
Accumulator := Accumulator * Base + (10 +
ord(Number[i]) - ord('a'));
end
else
begin
writeln ('Ignoring ''', Number[i], '''');
end;
end;
StringToInteger := Accumulator;
end;
function ReverseString (s : string) : string;
var
i : integer;
t : string;
begin
t := '';
for i := Length(s) downto 1 do
begin
t := t + s[i];
end;
ReverseString := t;
end;
function IntegerToString (Number : longint; Base : integer) : string;
var
r : string;
NewDigit : integer;
begin
r := '';
while Number > 0 do
begin
NewDigit := Number mod Base;
if NewDigit < 10 then
begin
r := r + chr(NewDigit+ord('0'));
end
else
if NewDigit < 36 then
begin
r := r + chr(NewDigit+ord('A')-10);
end;
Number := Number div Base;
end;
IntegerToString := ReverseString (r);
end;
begin
write ('Enter number: ');
readln (InputNumber);
write ('Enter input base: ');
readln (InputBase);
write ('Enter output base: ');
readln (OutputBase);
writeln;
Value := StringToInteger(InputNumber, InputBase);
OutputNumber := IntegerToString(Value, OutputBase);
writeln (InputNumber,'(',InputBase,') = ',Value,'(10) =
',OutputNumber,'(',OutputBase,')');
end.
Again this is more than I'd asked for. I'm so impressed with the
software community. You guys are just so generous!!
With Lots of Thanks and other Sincere signals of fratitude
Chrissy
prev parent reply other threads:[~2003-09-08 2:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-07 15:30 Octal Conversion in VB chrissy
2003-09-07 16:08 ` Ludovic Brenta
2003-09-07 20:14 ` Robert I. Eachus
2003-09-07 20:22 ` David C. Hoos
2003-09-07 23:07 ` Robert I. Eachus
2003-09-08 2:46 ` chrissy [this message]
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox