在Object Pascal 中 ‘div’‘/’'Mod'

对不同的类型的表达式相除要选用不同的除法运算符：

/  是对浮点数做除法运算；

div 是对整数做除法运算；

mod 取模  就是取余数；

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;


var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  i : integer;
  f : Real;
begin
  i := 4/3;             //这个引起编译器错误
  f := 3.4 div 2.3;  //这个引起编译器错误
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  i : integer;
  f : Real;
begin
  i := 6 div 3;         //正确
  f := 3.4 / 2.3;      //正确
  ShowMessage(IntToStr(i));
  ShowMessage(FloatToStr(f));
end;

end.