unit1.pas

来自「本光盘是《Delphi 7应用教程》一书的配套光盘」· PAS 代码 · 共 46 行

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
Function A(n:Integer):Integer; //自定义函数（形参为值参）
begin
  Case n of                     //Case语句
    1:A:=12;
    else
      A:=A(n-1)+3;              //递归调用
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  m,k:Integer;                //定义局部变量
begin
  m:=6;
  k:=A(m);                   //函数递归调用
  Edit1.Text:=IntToStr(k);   //整型数据转换成字符串
end;

end.