学习官方示例 - System.Frac: 返回小数部分

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);

var

  x,y: Real;

begin

  x := Frac(456.123);

  y := Frac(-456.123);



  ShowMessage(FloatToStr(x)); {返回：0.123}

  ShowMessage(FloatToStr(y)); {返回：-0.123}

end;



end.