Error: Operator is not overloaded: "Real" mod "Real"?

Question

Lazarus

Hello everyone
, I don’t understand why the error unit1.pas (75,13) Error: Operator is not overloaded: "Real" mod "Real"
in programming, I do not
thank you very much in advance

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls;

type

  { TForm1 }

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Edit1Change(Sender: TObject);
  private

  public

  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

procedure TForm1.Button1Click(Sender: TObject);
var a, b, s: real;
begin
     a := StrToFloat(Edit1.Text);
     b := StrToFloat(Edit2.Text);
     s:= a+b;
     ShowMessage('a+b)= '+FloatTostr(s)+' ' );
end;

procedure TForm1.Button2Click(Sender: TObject);
var a, b, r: real;
begin
     a := StrToFloat(Edit1.Text);
     b := StrToFloat(Edit2.Text);
     r:= a-b;
     ShowMessage('a-b)= '+FloatTostr(r)+' ' );
end;

procedure TForm1.Button3Click(Sender: TObject);
var a, b, d: real;
begin
     a := StrToFloat(Edit1.Text);
     b := StrToFloat(Edit2.Text);
     d:= a/b;
     ShowMessage('a/b)= '+FloatTostr(d)+' ' );
end;

procedure TForm1.Button4Click(Sender: TObject);
var a, b: real; v: double;
begin
     a := StrToFloat(Edit1.Text);
     b := StrToFloat(Edit2.Text);
     v := a mod b; // здесь ошибка
     ShowMessage('a%b)= '+FloatTostr(v)+' ' );
end;

procedure TForm1.Edit1Change(Sender: TObject);
begin

end;

end.

Answer 1

Because the div and mod operators in Pascal are used only for integer division, they do not work with real types