funkcie - max, mocnina

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button4Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
  function mocnina(a:integer):integer; //a: parameter funkcie
    begin
      //mocnina:=a*a;
    result:=a*a;     //výsledok ulož do funkcie
    end;

  function max(a,b:integer):integer;
    begin
      if a>b then result:=a else result:=b;
    end;

  function parneneparne(a:integer):string;
    begin
      if a mod 2 = 0 then result:='Číslo je párne' else result:='Číslo je nepárne';

    end;

  function cifra(a:char):boolean;
    begin
      if (a>='0') and (a<='9') then
      result:=true
        else
      result:=false;
    end;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
a:integer;
begin
a:=StrToInt(Edit1.Text);
//mocnina(a);        //Tento riadok nie je potrebný
showmessage(inttostr(mocnina(a)));

end;

procedure TForm1.Button2Click(Sender: TObject);
var
a,b:integer;
begin
a:=StrToInt(Edit1.Text);
b:=StrToInt(Edit2.Text);
//max(a,b);
showmessage(inttostr(max(a,b)));

end;

procedure TForm1.Button3Click(Sender: TObject);
var
a:integer;
begin
a:=StrToInt(Edit1.Text);
Showmessage(parneneparne(a));
end;

procedure TForm1.Button4Click(Sender: TObject);
var
a:char;
begin
a:=Edit1.Text[1];
if cifra(a) then
showmessage('Je to cifra') else showmessage ('Je to text');
end;

end.