//要点13: 需要给其他单元调用, 必须在 interface 声明, 但必须在 uses 区后面
unit Unit1;
interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
end;
{需要给其他单元调用, 必须在 interface 声明, 但必须在 uses 区后面}
function MyFun(x,y: Integer): Integer; {函数声明}
var
Form1: TForm1;
implementation{$R *.dfm}
function MyFun(x,y: Integer): Integer; {函数实现}
begin
Result := x + y;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
i: Integer;
begin
i := MyFun(1,2);
ShowMessage(IntToStr(i)); {3}
end;
end.