форма12

Unit Main;

Interface

Uses
    Winapi.Windows,
    Winapi.Messages,
    System.SysUtils,
    System.Variants,
    System.Classes,
    Vcl.Graphics,
    Clipbrd,
    Vcl.Controls,
    Vcl.Forms,
    Vcl.Dialogs,
    Vcl.StdCtrls,
    Vcl.Menus,
    Vcl.ExtCtrls,
    Vcl.Imaging.Pngimage;

Type
    TMainForm = Class(TForm)
        Button1: TButton;
        EditA: TEdit;
        EditB: TEdit;
        MainMenu1: TMainMenu;
        N1: TMenuItem;
        N2: TMenuItem;
        N3: TMenuItem;
        N4: TMenuItem;
        N5: TMenuItem;
        Y1: TLabel;
        X: TLabel;
        BalloonHint1: TBalloonHint;
        OpenDialog1: TOpenDialog;
        SaveDialog1: TSaveDialog;
        Y: TLabel;
        Result: TMemo;
        LabelTask: TLabel;
        Procedure Button1Click(Sender: TObject);

        Procedure N2Click(Sender: TObject);
        Procedure N5Click(Sender: TObject);

        Procedure EditBKeyPress(Sender: TObject; Var Key: Char);
        Procedure EditAKeyPress(Sender: TObject; Var Key: Char);
        Procedure N3Click(Sender: TObject);
        Procedure GetPath(Var Path: String);
        Procedure N4Click(Sender: TObject);
        Procedure Checker(Var IsCorrect: Boolean);
        Procedure N1Click(Sender: TObject);
        Procedure EditAChange(Sender: TObject);
        Procedure EditBChange(Sender: TObject);
        Procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
        Procedure FormCloseQuery(Sender: TObject; Var CanClose: Boolean);
        Procedure EditAContextPopup(Sender: TObject; MousePos: TPoint; Var Handled: Boolean);
        Procedure EditBContextPopup(Sender: TObject; MousePos: TPoint; Var Handled: Boolean);
    Private
        { Private declarations }
    Public
        { Public declarations }
    End;

Const
    E: Double = 1.0E-3;
    NumSet = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', #8, #44, #45, #46];

Var
    MainForm: TMainForm;

Implementation

{$R *.dfm}

Uses
    Instruction,
    Information;

Procedure TmainForm.Checker(Var IsCorrect: Boolean);

Begin
    IsCorrect := True;

    Try
        StrtoFloat(EditA.Text);
    Except
        IsCorrect := False;
    End;

    Try

        StrtoFloat(EditB.Text);
    Except
        IsCorrect := False;
    End;

End;

Procedure TMainForm.Button1Click(Sender: TObject);
Var
    A, B, R, I: Integer;
    IsCorrect: Boolean;
Begin
    Checker(IsCorrect);
    If IsCorrect Then
    Begin

        A := StrtoInt(EditA.Text);
        B := StrtoInt(EditB.Text);
        R := 1;
        If (A < (B + 1)) Then
        Begin
            A := A - 1;
            for i := 0 to A do
            begin
                R := R*(B-I);

            end;
            Result.Lines.Clear;
            Result.Lines.Add('Число размещений равно ' +FloatToStr(R));
        End
        Else
        Begin
            ShowMessage('Введите верные значения, где N > M.');
        End;

    End
    Else
    Begin
        ShowMessage('Заполните все поля');
    End;

End;


Procedure TMainForm.EditBChange(Sender: TObject);
Var
    Value: Double;
Begin
    If TryStrToFloat(EditB.Text, Value) Then
    Begin
        If (Value < 0) Then
        Begin
            BalloonHint1.Title := 'Неверное значение.';
            BalloonHint1.Description := 'N должно быть больше 0.';
            BalloonHint1.ImageIndex := 1;
            BalloonHint1.ShowHint(EditB);
            EditB.Text := '';
        End;
    End;
    EditB.MaxLength := 5;
    If Length(EditB.Text) = 0 Then
    Begin
        Result.Lines.Clear;
    End;
End;

Procedure TMainForm.EditBContextPopup(Sender: TObject; MousePos: TPoint; Var Handled: Boolean);
Begin
    Handled := True;
End;

Procedure TMainForm.EditBKeyPress(Sender: TObject; Var Key: Char);
Begin
    If Key In NumSet Then
    Begin
        If Key = '0' Then
        Begin
            If Length(EditB.Text) = 1 Then
            Begin
                If EditB.Text[1] In ['0'] Then
                Begin
                    Key := #0;
                End;
            End;
            If Length(EditB.Text) = 2 Then
            Begin
                If (EditB.Text[1] = '-') AND (EditB.Text[2] = '0') Then
                Begin
                    Key := #0;
                End;
            End;
        End;

        If Key = #45 Then
        Begin
            If Length(EditB.Text) > 0 Then
            Begin
                BalloonHint1.Title := 'Недопустимый символ.';
                BalloonHint1.Description := 'Здесь можно ввести только число.';
                BalloonHint1.ShowHint(EditB);
                Key := #0;
            End;
        End;

        If Key In [',', '.'] Then
        Begin
            Key := FormatSettings.DecimalSeparator;
            If Pos(Key, EditB.Text) <> 0 Then
            Begin
                BalloonHint1.Title := 'Недопустимый символ.';
                BalloonHint1.Description := 'Здесь можно ввести только число.';
                BalloonHint1.ImageIndex := 1;
                BalloonHint1.ShowHint(EditB);
                Key := #0;
            End
            Else
                If Length(EditB.Text) > 0 Then
                Begin
                    If (EditB.Text[1] = '-') AND (Length(EditB.Text) = 1) Then
                    Begin
                        Key := #0;
                    End
                End
                Else
                    If EditB.SelStart = 0 Then
                    Begin
                        EditB.Text := '0' + EditB.Text;
                        EditB.SelStart := 1;
                    End;
        End;
    End
    Else
    Begin
        BalloonHint1.Title := 'Недопустимый символ.';
        BalloonHint1.Description := 'Здесь можно ввести только число.';
        BalloonHint1.ImageIndex := 1;
        BalloonHint1.ShowHint(EditB);
        Key := #0;
    End;
End;

Procedure TMainForm.FormCloseQuery(Sender: TObject; Var CanClose: Boolean);
Var
    Confirmation: Integer;
Begin
     Confirmation := Application.MessageBox('Вы действительно хотите выйти?', 'Выход', MB_YESNO);
    CanClose := Confirmation = IDYES;
End;

Procedure TMainForm.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
Begin
    If (EditA.Text <> '') And (EditB.Text <> '') Then
        Button1.Enabled := True
    Else
        Button1.Enabled := False;
End;

Procedure TMainForm.EditAChange(Sender: TObject);
Var
    Value: Double;
Begin
    If TryStrToFloat(EditA.Text, Value) Then
    Begin
        If (Value < 1) Then
        Begin
            BalloonHint1.Title := 'Неверное значение.';
            BalloonHint1.Description := 'N должно быть больше 0.';
            BalloonHint1.ImageIndex := 1;
            BalloonHint1.ShowHint(EditA);
            EditA.Text := '';
        End;
    End;
    EditA.MaxLength := 5;
    If Length(EditA.Text) = 0 Then
    Begin
        Result.Lines.Clear;
    End;
End;

Procedure TMainForm.EditAContextPopup(Sender: TObject; MousePos: TPoint; Var Handled: Boolean);
Begin
    Handled := True;
End;

Procedure TMainForm.EditAKeyPress(Sender: TObject; Var Key: Char);
Begin

    If Key In NumSet Then
    Begin
        If Key = '0' Then
        Begin
            If Length(EditA.Text) = 1 Then
            Begin
                If EditA.Text[1] In ['0'] Then
                Begin
                    Key := #0;
                End;
            End;
            If Length(EditA.Text) = 2 Then
            Begin
                If (EditA.Text[1] = '-') AND (EditA.Text[2] = '0') Then
                Begin
                    Key := #0;
                End;
            End;
        End;

        If Key = #45 Then
        Begin
            If Length(EditA.Text) > 0 Then
            Begin
                BalloonHint1.Title := 'Недопустимый символ.';
                BalloonHint1.Description := 'Здесь можно ввести только число.';
                BalloonHint1.ImageIndex := 1;
                BalloonHint1.ShowHint(EditA);
                Key := #0;
            End;
        End;

        If Key In [',', '.'] Then
        Begin
            Key := FormatSettings.DecimalSeparator;
            If Pos(Key, EditA.Text) <> 0 Then
            Begin
                BalloonHint1.Title := 'Недопустимый символ.';
                BalloonHint1.Description := 'Здесь можно ввести только число.';
                BalloonHint1.ImageIndex := 1;
                BalloonHint1.ShowHint(EditA);
                Key := #0;
            End
            Else
                If Length(EditA.Text) > 0 Then
                Begin
                    If (EditA.Text[1] = '-') AND (Length(EditA.Text) = 1) Then
                    Begin
                        Key := #0;
                    End
                End
                Else
                    If EditA.SelStart = 0 Then
                    Begin
                        EditA.Text := '0' + EditA.Text;
                        EditA.SelStart := 1;
                    End;
        End;
    End
    Else
    Begin
       BalloonHint1.Title := 'Недопустимый символ.';
        BalloonHint1.Description := 'Здесь можно ввести только число.';
        BalloonHint1.ImageIndex := 1;
        BalloonHint1.ShowHint(EditA);
        Key := #0;
    End;
End;

Procedure TMainForm.N1Click(Sender: TObject);
Begin
    If Result.Lines.Count = 0 Then
    Begin
        N4.Enabled := False;
    End
    Else
    Begin
        N4.Enabled := True;
    End;
End;

Procedure TMainForm.N2Click(Sender: TObject);
Begin
    InstructionForm.ShowModal;
End;

Procedure TMainForm.GetPath(Var Path: String);
Begin
    If OpenDialog1.Execute Then
    Begin
        Path := OpenDialog1.FileName;
    End
    Else
    Begin
        ShowMessage('Открытие файла отменено!');
    End;
End;

procedure TMainForm.N3Click(Sender: TObject);
var
  IsCorrect, Fail: Boolean;
  Path, A, B, Str: String;
  Count: Integer;
  FileElem: TextFile;
begin
  GetPath(Path);

  AssignFile(FileElem, Path);
  Fail := False;
  IsCorrect := True;
  Count := 0;

  if not FileExists(Path) then
  begin
    ShowMessage('Файл не найден!');
    Exit;
  end;

  try
    try
      Reset(FileElem);
    except
      CloseFile(FileElem);
      IsCorrect := False;
      ShowMessage('Ошибка открытия файла.');
    end;

    if IsCorrect then
    begin
      while not Eof(FileElem) do
      begin
        ReadLn(FileElem, Str);
        Inc(Count);
      end;

      CloseFile(FileElem);
      if Count <> 2 then
        Fail := True;
    end;

    if IsCorrect then
    begin
      Reset(FileElem);

      try
        Readln(FileElem, A);
        if not TryStrToInt(A, Count) then
          Fail := True;
      except
        Fail := True;
      end;

      try
        Readln(FileElem, B);
        if not TryStrToInt(B, Count) then
          Fail := True;
      except
        Fail := True;
      end;
    end;
  finally
    CloseFile(FileElem);
    if Fail then
      ShowMessage('Проверьте введенные данные и повторите попытку!')
    else
    begin
      EditA.Text := A;
      EditB.Text := B;
    end;
    ShowMessage('Обработка завершена.');
  end;
end;

Procedure TMainForm.N4Click(Sender: TObject);
Begin

    If SaveDialog1.Execute Then
    Begin

        Result.Lines.SaveToFile(SaveDialog1.FileName);
    End
    Else

    Begin
        ShowMessage('Сохранение в файл отменено.');
    End;

End;

Procedure TMainForm.N5Click(Sender: TObject);
Begin
    InformationForm.ShowModal;
End;

End.