Illegal expression in Else line

Question

When I try to compilate my code a

"unit1.pas(53,1) Error: Illegal expression"

in else line appears.

procedure TForm1.Button1Click(Sender: TObject);
var x: real;
begin
x:=StrToFloat(Edit1.Text);
if x>=0
then
Label1.Caption= FloatToStr(x)
else
Label1.Caption:= Floattostr(x);

Answer 1

What's wrong is the expression before the else. You have an equals sign = where you ought to have an assignment operator :=, as you have in the else:

if x>=0 then 
  Label1.Caption := FloatToStr(x) 
else 
  Label1.Caption:= Floattostr(x);