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Formating Numbers

Posted on 1997-07-10
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Last Modified: 2010-04-06
How do I format numbers in a label with commas, dollar sign, or percentages?  For example, I want the number 1200 to appears are either

1,000
$1,200.00
1200%

Code examples would be most useful.
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Question by:d4jaj1
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13 Comments
 
LVL 1

Expert Comment

by:kevinb062397
Comment Utility
This will add the commas every 3rd char:
var
tempsize:string;
begin
tempsize:=<string>
   if length(<string>) > 3 then
   insert(',',tempsize,length(tempsize)-2);

   if length(<string>) > 6 then
   insert(',',tempsize,length(tempsize)-6);

   if length(<string>) > 9 then
   insert(',',tempsize,length(tempsize)-10);

To add the decimal:
//adjust the values in the code above if you use this. add 2 to //each value.
insert('.',<string>,length(string)-2);

To add the '$':
string := '$' + string;

To add the '%':
string := string + %;
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Author Comment

by:d4jaj1
Comment Utility
I apologize for being vague with my question.  My problem really is formating numbers (not strings) in their correct type.  For example, my code sums the number of values in a database, which happen to be currency.  If the count returns a total of $12.78, the display in my label is 13!  How do I make the label show $12.78 instead of $13.00 -- which is what your example would produce?
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LVL 1

Expert Comment

by:kevinb062397
Comment Utility
This might be what you are looking for.

var
   S, T: string;
begin
   Str(1.4:2:1, T);
   S := T + ' rounds to ' + IntToStr(Round(1.4)) + #13#10;
   Str(1.5:2:1, T);
   S := S + T + ' rounds to ' + IntToStr(Round(1.5)) + #13#10;
   Str(-1.4:2:1, T);
   S := S + T + ' rounds to ' + IntToStr(Round(-1.4)) + #13#10;
   Str(-1.5:2:1, T);
   S := S + T + ' rounds to ' + IntToStr(Round(-1.5));
   MessageDlg(S, mtInformation, [mbOk], 0);
end;

If not let me know...

What label are you using?
Most labels only understand strings, therefore if you read a real number convert it to a string add a '.' between length(string)-2 and length(string)-3. You would have a decimal value to 2 places.  Adding the ','s to every 3rd position to the left of the decimal would give me standard notation.

If what you are looking four is how to change the notation in the db field then look at the Database Desktop.  There are options there for setting the "Money" Field.


Let me know how this works.
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LVL 3

Author Comment

by:d4jaj1
Comment Utility
Now I'm confused. I though you were going to provide me with information on the CurrencyString or CurrencyFormat constants.  All I'm trying to do is some up numbers from a DBGrid and display them to a user.  I really don't care if it's a label, db field, etc.  How can I do this?
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Expert Comment

by:danGynn
Comment Utility
Okay, if you have a real number all you have to do to display it as a string with formatting is use the FormatFloat(string, real) procedure.  If your num is the real value 12.78 then to display it as a string simply use:
FormatFloat('$#,##0.00', num) ;


Hope this is what you are looking for.
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Author Comment

by:d4jaj1
Comment Utility
Sorry for the delay, I've had trouble upgrading to D3 and finally had to re-install D2.

Having said that, I'm having a problem with your solution.  It compiles okay, but doesn't give me the results I'm looking for, which is displaying the sum of numbers from a table to the user in a specific format.  I really don't care if its a text box, a calculated field, etc.

I have included my code below.  The number is sumed correctly, but it is still in integer format.  Can you tell me what I'm doing wrong?

var
Total: Integer;
begin
Total := 0;
tblDateHist.disablecontrols;
tblDateHist.first;
while not tblDateHist.EOF do
  begin
    Total := Total + tblDateHist.FieldByName('$ Spent').AsInteger;
     tblDateHist.next;
  end;
tblDateHist.enablecontrols;
FormatFloat('$#,##0.00', Total);
Spent.Caption := Inttostr(Total);
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Author Comment

by:d4jaj1
Comment Utility
I don't understand why this is so difficult!  All I want to do to total a currency filed in a tabel and display it to the user.  My code is above.
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Accepted Solution

by:
ronit051397 earned 20 total points
Comment Utility
I think you should write:
Total := Total + tblDateHist.FieldByName('$ Spent').AsFloat;
This is not an Integer field, Am I right?
0
 
LVL 3

Author Comment

by:d4jaj1
Comment Utility
Didn't work.  Got an error stating - 'Incompatable Types - Integer and Real'.  I also tried to change Total to Currency in the VAR section and removed the 'Inttostr' at the end where I try to place the value in the label and got this error - 'Incompatible Types - string and Currency'.  Any suggestions?
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LVL 5

Expert Comment

by:ronit051397
Comment Utility
I don't understand, is the '$Spent' field is declared in the table as currency field?
If so, then you should use AsCurrency instead of AsInteger.
If not so, then how is it declared?
Beside, You should declare the 'Total' variable as Double and not as Integer.
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LVL 3

Author Comment

by:d4jaj1
Comment Utility
Okay, I changed the type of Total to Double and added the AsCurrency and stil recieve an error - Incompatable Types - Double and string.  '$ Spent' is a Paradox Money ($) field type.  An excerpt of my latest code is below;


var
Total: Double;
begin
Total := 0;
tblDateHist.disablecontrols;
tblDateHist.first;
while not tblDateHist.EOF do
  begin
    Total := Total + tblDateHist.FieldByName('$ Spent').AsCurrency;
    tblDateHist.next;
  end;
tblDateHist.enablecontrols;

FormatFloat('$#,##0.00', Total);
Spent.Caption := Total;   //This is were I get the above error.
0
 
LVL 5

Expert Comment

by:ronit051397
Comment Utility
That is becuase you should write:
Spent.Caption := FormatFloat('$#,##0.00', Total);
Caption and Float are differenet types (basic stuff).
Format of something always returns string.
0
 
LVL 3

Author Comment

by:d4jaj1
Comment Utility
That was it.  Thanks.  I realized they were of different types, I just didn't know how to convert the float to a string and display it.

From the questions I ask, it is obvious I don't know a lot about Delphi.  That's because I'm trying to re-write a Paradox application for distribution.  The folks at Borland said, "it would be 'really' easy to do with Delphi, all I had to do was re-create the forms and Pascal is soooo easy, you don't have to had ever written code".  Of course they lied, but there's only so much I can learn from a book in two & a half  months (I started in June).  That's why I ask you experts my silly little questions.
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