why does not this work

procedure TPostavke.SpeedButton1Click(Sender: TObject);
var a,b,c: integer;
begin
if TryStrToInt(dbedit8.text,a) and TryStrToInt(edit40.Text,b) and TryStrToInt(edit50.text,c) then
  c:= a - b;

end;
VrtnarAsked:
Who is Participating?
 
TNameConnect With a Mentor Commented:
Or du you want to display the result in edit50?
Then you should try something like:

procedure TPostavke.SpeedButton1Click(Sender: TObject);
var a,b,c: integer;
begin
  if TryStrToInt(dbedit8.text,a) and TryStrToInt(edit40.Text,b) then begin
    c:= a - b;
    edit50.Text:=IntToStr(c);
  end;
end;
0
 
TNameCommented:
It should work, but are you sure you want to test if c is an integer...?
a and be should be integers, c could be empty, you overwrite it's value anyway,


procedure TPostavke.SpeedButton1Click(Sender: TObject);
var a,b,c: integer;
begin
if TryStrToInt(dbedit8.text,a) and TryStrToInt(edit40.Text,b) then
  c:= a - b;
 
ShowMessage(IntToStr(c));
end;
0
 
TNameCommented:
>if c is an integer
I mean if edit50.Text is an integer (and dbedit8.Text and edit40.Text...)    ;)
0
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