Delphi: "Incompatible types Integer and Extended"

Question

I currently face the problem of not being able to divide my ClientWidth by 2 (or multiply with 0.5 because of the error message Delphi is giving me:

[Error] Unit1.pas(59): Incompatible types: 'Integer' and 'Extended'
[Error] Unit1.pas(60): Incompatible types: 'Integer' and 'Extended'
[Error] Unit1.pas(61): Incompatible types: 'Integer' and 'Extended'

procedure TForm1.FormResize(Sender: TObject);
begin
 // responsive design
 with form1 do begin
 cmdFakultat.left:=0.5*ClientWidth-60;
 txtEingabe.left:=0.5*ClientWidth-60;
 lblAusgabe.left:=0.5*ClientWidth-60;
 end;
end;

end.

Answer 1

Use the Trunc or Round functions, depending on your desired behavior, like this...

lblAusgabe.left := Trunc(0.5 * ClientWidth) - 60;

or

lblAusgabe.left := Round(0.5 * ClientWidth) - 60;

This cuts everything off after the decimal, leaving just an Integer type as a result.

As an alternative, you could also use div to accomplish this, which is a bit more straight-forward and does this conversion for you...

lblAusgabe.left := (ClientWidth div 2) - 60;