second form

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Menus;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Button1: TButton;
    Label3: TLabel;
    Edit1: TEdit;
    MainMenu1: TMainMenu;
    PopupMenu1: TPopupMenu;
    SaveDialog1: TSaveDialog;
    OpenDialog1: TOpenDialog;
    dd1: TMenuItem;
    N1: TMenuItem;
    N2: TMenuItem;
    N3: TMenuItem;
    N4: TMenuItem;
    procedure Button1Click(Sender: TObject);
    procedure Edit1Change(Sender: TObject);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure N1Click(Sender: TObject);
    procedure N2Click(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure N3Click(Sender: TObject);
    procedure N4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Path, Result : String;
  IsFileOpen : Boolean;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
Var
    Degree, I, Number, TempResult : Integer;
Const
    Step = 6;
    Label2Start = 101;
    Label3Start = 114;
begin
    Degree := StrToInt(Edit1.Text);
    Number := 1;
    For I := 1 to Degree do
        Number := Number * 2;
    // этот кусочек отвечает за сдвиг пропорционально кол-ву цифр в результате
    Label3.Left := Label3Start;
    Label2.Left := Label2Start;
    TempResult := Number;
    While ((TempResult div 10) > 0) do
    Begin
        Label3.Left := Label3.Left - Step;
        Label2.Left := Label2.Left - Step;
        TempResult := TempResult div 10;
    End;

    Label2.Caption := '2 ' + ' = ' + IntToStr(Number);
    Label3.Caption := IntToStr(Degree);
    Result := '2 в степени ' + IntToStr(Degree) + ' равно ' + IntToStr(Number);
    N4.Enabled := True;
end;

procedure TForm1.Edit1Change(Sender: TObject);
begin
    N4.Enabled := False;
    If ((Length(Edit1.Text) = 0)) then
    Begin
        Button1.Enabled := False;
    End
    Else
    Begin
        Button1.Enabled := True;
    End;
    Label2.Caption := '';
    Label3.Caption := '';
end;

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
    If ((Key = #13) And (Button1.Enabled)) Then
        Button1.Click;
    If (Not(Key In ['0'..'9', #08, #46])) Then
        Key := #0;
    If ((Length(Edit1.Text) = 0) and (Key = '0')) Then
        Key := #0;
    If ((Key = #08) or (Key = #46)) then
    Begin
        Label3.Caption := '';
        Label2.Caption := '';
    End;

    If ((Length(Edit1.Text) = 1) and (StrToInt(Edit1.Text) = 3)) then
        If Not(Key In [#08, #46, '0']) Then
            Key := #0;
    If ((Length(Edit1.Text) = 2)) then
        If Not(Key In [#08, #46]) Then
            Key := #0;
    If (Length(Edit1.Text) = 1) and Not((StrToInt(Edit1.Text) = 2) or (StrToInt(Edit1.Text) = 1)) then
    Begin
        If (StrToInt(Edit1.Text) = 3) then
            If Not(Key In [#08, #46, '0']) Then
                Key := #0;
        If Not(Key In [#08, #46]) and Not(StrToInt(Edit1.Text) = 3)  Then
            Key := #0;
    End;
end;


procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
    CanClose := MessageBox(Form1.Handle, 'Вы уверены, что хотите выйти?', 'Выход', MB_YESNO + MB_ICONQUESTION)=ID_YES;
end;

procedure TForm1.N1Click(Sender: TObject);
begin
    Application.MessageBox('Программа вычисляет 2 в степени n, где n - натуральное число.'#13#10'Это лабораторная 1.2 (в название формы не поместилось)'#13#10'Внимание! Степень числа должна быть не более 30.', 'Инструкция', 0);
end;

procedure TForm1.N2Click(Sender: TObject);
begin
    Application.MessageBox('Арефин Владислав гр.251004', 'Разрабочик', 0);
end;

Function CheckFileData(Num: String): Boolean;
Const
    MAX_LIM = 30;
    MIN_LIM = 1;
Var
    NewNum: Integer;
    IsCorrect: Boolean;
Begin
    NewNum := 0;
    IsCorrect := True;
    Try
        NewNum := StrToInt(Num);
    Except
        MessageBox(Form1.Handle, Pchar('Проверьте корректность данных.'), 'Ошибка', MB_ICONSTOP);
        IsCorrect := False;
    End;
    If(IsCorrect And ((NewNum > MAX_LIM) Or (NewNum < MIN_LIM))) Then
    Begin
        Num := IntToStr(NewNum);
        MessageBox(Form1.Handle, Pchar('Недопустимое значение!'), 'Ошибка', MB_ICONSTOP);
        IsCorrect := False;
    End;
    CheckFileData := IsCorrect;
End;

Function Open (): String;
Begin
    With Form1 Do
    Begin
        If OpenDialog1.Execute Then
        Begin
            Path := OpenDialog1.FileName;
            IsFileOpen := True;
        End
        Else
            IsFileOpen := False;
    End;
    Open := Path;
End;

Function TakeDataFromFile(Side: String; Var FileOutput: TextFile): String;
Var
    IsRight : Boolean;
Begin
    IsRight := True;
    Try
        Read(FileOutput, Side);
        IsRight := CheckFileData(Side);
    Except
    End;
    If(Not(IsRight)) Then
        TakeDataFromFile := ''
    Else
        TakeDataFromFile := Side;
End;

procedure TForm1.N3Click(Sender: TObject);
Var
    FileInput: TextFile;
    Num : Integer;
    Str : String;
begin
    Num := 0;
    Path := Open;
    AssignFile(FileInput, Path);
    Reset(FileInput);
    If(IsFileOpen) Then
        Str := TakeDataFromFile(IntToStr(Num), FileInput);
    if (Length(Str) > 0) then
    Begin
        Edit1.Text := Str;
    End
    Else
        Edit1.Text := #0;
    CloseFile(FileInput);
end;

procedure TForm1.N4Click(Sender: TObject);
Var
    FileOutput: TextFile;
begin
    Path := Open;
    If (IsFileOpen) Then
    Begin
        AssignFile(FileOutput, Path);
        Rewrite(FileOutput);
        Write(FileOutput, Result);
        Application.MessageBox('Запись файла выполнена успешно.', 'Результат', 0);
        CloseFile(FileOutput);
        Label3.Caption := '';
        Label2.Caption := '';
        Edit1.Text := '';
    End;
end;

end.