Why doesn't this work?

[357mag 2]

I've got a program that asks the user to enter the name of a boy, and the name of a girl. Then he clicks on the Add Couple button, and the boy and girl are added to a listbox together. They're going to a dance together.

 

But the compiler will not let me list the variables on individual lines. It will only list my variables on one line. Even my book says you can also write it like this.

 

This does not work:

procedure TFormStringConcatenation.ButtonAddCoupleClick(Sender: TObject);
begin
  Var
    Boy: string;
    Girl: string;
    Couple: string;

    Boy := EditEnterBoy.Text;
    Girl := EditEnterGirl.Text;
    Couple := Boy + ' and ' + Girl;
    ListBoxCouple.Items.Add(Couple);

This however does work:

 

procedure TFormStringConcatenation.ButtonAddCoupleClick(Sender: TObject);
begin
  Var Boy, Girl, Couple: string;

    Boy := EditEnterBoy.Text;
    Girl := EditEnterGirl.Text;
    Couple := Boy + ' and ' + Girl;
    ListBoxCouple.Items.Add(Couple);
end;

 

[Uwe Raabe 2063]

You are using inline variables. Try moving the variables declaration before the begin.

procedure TFormStringConcatenation.ButtonAddCoupleClick(Sender: TObject);
Var
  Boy: string;
  Girl: string;
  Couple: string;
begin
  Boy := EditEnterBoy.Text;
  Girl := EditEnterGirl.Text;
  Couple := Boy + ' and ' + Girl;
  ListBoxCouple.Items.Add(Couple);

 

[357mag 2]

That won't work either. Compiler says "undeclared identifier."

[Anders Melander 1813]

Just now, 357mag said:

That won't work either.

Yes it does. Try again and this time do it exactly like Uwe showed you.

[357mag 2]

Okay I got it working now.

[Lars Fosdal 1793]

Why won't this work with inline vars?
Is it the ListBox.Items.Add that doesn't copy the Couple string?

[Uwe Raabe 2063]

With inline vars this works:

Var Boy, Girl, Couple: string;

But this does not:

  Var
    Boy: string;
    Girl: string;
    Couple: string;

 

[Sherlock 663]

What does "work" mean in this case? No Compiler error?

[Lajos Juhász 295]

procedure TForm1.FormCreate(Sender: TObject);
begin
 Var
    Boy: string;
    Girl: string;
    Couple: string;
end;

For those who doesn't have a modern compiler. Of course inline var is not a block thus it will produce errors:

 

[dcc32 Error] Unit1.pas(29): E2003 Undeclared identifier: 'Girl'
[dcc32 Error] Unit1.pas(29): E2029 '(' expected but ';' found
[dcc32 Error] Unit1.pas(30): E2003 Undeclared identifier: 'Couple'
[dcc32 Fatal Error] Project1.dpr(5): F2063 Could not compile used unit 'Unit1.pas'
Failed