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how pad you pad a string with leading spaces?

Posted on 1998-12-04
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Last Modified: 2012-05-04
I have a SSN variable
I want it fixed length of 9 with spaces padded in front.
example:
SSN 123       before
SSN       123 after
-----------------------
SSN 1234      before
SSN      1234 after

i guess i want it right justified with leading spaces.
anybody have any clue? Do I use LPAD???? if so, do i need
to find out the lenght of the SSN first?
thanks
0
Comment
Question by:waipahu
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9 Comments
 
LVL 4

Expert Comment

by:erajoj
ID: 1349304
Is something like this what you want?:

function PadString(str: string; len:Integer; ch: Char):string;
begin
  Result := '';
  for iIndex := 1 to len-Length(str) do
    AppendStr(Result, ch);
  AppendStr(Result, str);
end;

/// John
0
 
LVL 35

Expert Comment

by:TimYates
ID: 1349305
Or : (a bit faster)

function PadString(str: string; len:Integer; ch: Char):string;
begin
  result := Trim( str ) ;
  while( Length( str ) < len ) do
    result := ch + result ;
end;

0
 

Author Comment

by:waipahu
ID: 1349306
I got it!
I used TOPAZ LPAD to do the left pad with spaces!
THank you all!

Can delphi be web enabled?  How would you do it?
Do i need a webserver of some sort?
Do I need the client-server version of delphi?

0
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LVL 4

Expert Comment

by:erajoj
ID: 1349307
Tim, could you please tell me in what way your code is faster?
Have you tested it? I don't think so.

/// John
0
 
LVL 35

Expert Comment

by:TimYates
ID: 1349308
Hmmm, thought it should be, due to one less assign being required...  I'll test it now...

It might have been a fraudulent assumption *grin*

Tim.
0
 
LVL 35

Expert Comment

by:TimYates
ID: 1349309
Heh...
sorry about that...
yours was faster than mine...

Hmmm...what can I say....

I apologise for my big mouth...

And here is an _even faster_ bit of code to make up for it :)

function MyPadString( str : string; len : Integer; ch : Char ):string;
var
  p : pChar ;
  l, ll : longint ;
begin
  p := allocMem( len + 1 ) ;
  FillChar( p^, len, ch ) ;
  l := len - Length( str ) ;
  ll := Length( str ) ;
  if( ll > len ) then ll := len ;
  if( l < 0 ) then l := 0 ;
  CopyMemory( pChar( integer( p ) + l ), @str[ 1 ], ll ) ;
  result := strpas( p ) ;
  Freemem( p, len + 1 ) ;
end;

Now, that _is_ fast :)

Cheers, and sorry again,

Tim.
0
 
LVL 2

Expert Comment

by:lortega
ID: 1349310
KISS concept...

function PadLString(mString :String; Spaces :Integer):String;
begin
   result := StringOfChar(' ', Spaces) + Trim(mString)
end;

function PadRString(mString :String; Spaces :Integer):String;
begin
   result := Trim(mString) + StringOfChar(' ', Spaces);
end;


good luck,
luis
0
 

Accepted Solution

by:
teechong earned 40 total points
ID: 1349311
Don't you think using Format will do the job?
Format ('SSN %9d', [ssnnum] );

Of course, your labels or controls should use a fixed pitch font for proper display.
0
 

Author Comment

by:waipahu
ID: 1349312
Thanks for everybody who contributed!!!
I really appreciate it a lot!
This website is the best!
This is very helpful!
Go public....make big bucks (IPO)...

bye

0

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