форма22

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;
        ImageTask: TImage;
        EditC: TEdit;
        EditD: TEdit;
        Label1: TLabel;
        Label2: TLabel;
        Label3: TLabel;
        Label4: 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 EditRadMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
        Procedure EditAMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
        Procedure EditBMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
        Procedure FormMouseEnter(Sender: TObject);
        Procedure EditCChange(Sender: TObject);
        Procedure EditCKeyPress(Sender: TObject; Var Key: Char);
        Procedure EditDKeyPress(Sender: TObject; Var Key: Char);
        Procedure EditDChange(Sender: TObject);
        Procedure EditCMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
        Procedure EditDMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
    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;

Function NOD(A, B: Integer): Integer;
Var
 Temp: Integer;
Begin
 While B <> 0 Do
 Begin
 Temp := B;
 B := A Mod B;
 A := Temp;
 End;
 NOD := A;
End;

Function CheckNum(A, B: INTEGER): Boolean;

begin
  Result := Abs(A) < Abs(B);
end;

Function ChecSokr(A, B: INTEGER): Boolean;

begin
  Result := not((NOD(abs(a),abs(b)) <> 1) or ((a<0) and (b<0)));
end;

Procedure TMainForm.Button1Click(Sender: TObject);
Var
    A, B, C, D, NumEnd, DenomEnd, Temp: Integer;
    IsCorrect: Boolean;
Begin
        A := StrtoInt(EditA.Text);
        B := StrtoInt(EditB.Text);
        C := StrtoInt(EditC.Text);
        D := StrtoInt(EditD.Text);
    Checker(IsCorrect);
    if not (checknum(a,b) and checknum(c,d)) Then
         ShowMessage('Введите обыкновенные дроби.')
    else if not (ChecSokr(A, B) and ChecSokr(c, d)) then
         ShowMessage('Введите несократимые дроби.')
    else If IsCorrect then
    Begin

        A := StrtoInt(EditA.Text);
        B := StrtoInt(EditB.Text);
        C := StrtoInt(EditC.Text);
        D := StrtoInt(EditD.Text);
        DenomEnd := B * D;
        NumEnd := A * D - C * B;

        Temp := NOD(Abs(NumEnd), Abs(DenomEnd));
        NumEnd := NumEnd Div Temp;
        DenomEnd := DenomEnd Div Temp;
        If NumEnd Mod DenomEnd = 0 Then
        Begin
            Result.Lines.Clear;
            Result.Lines.Add('Искомая дробь: ' + IntToStr(NumEnd div DenomEnd));
        End
        Else
        Begin
            Result.Lines.Clear;
            Result.Lines.Add('Искомая дробь: ' + IntToStr(NumEnd) + '/' + IntToStr(DenomEnd));
        End;


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

End;

Procedure TMainForm.EditBChange(Sender: TObject);
Begin
    EditB.MaxLength := 6;
    If Length(EditB.Text) = 0 Then
    Begin
        Result.Lines.Clear;
    End;
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.ImageIndex := 1;
                BalloonHint1.ShowHint(EditB);
                Key := #0;
            End;
        End;

        if Key = '0' then // Проверяем знак минус
begin
  BalloonHint1.Title := 'Недопустимый символ.';
  BalloonHint1.Description := 'Здесь можно ввести только число неравное 0.';
  BalloonHint1.ImageIndex := 1;
  BalloonHint1.ShowHint(EditB);
  Key := #0;
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.EditBMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
Begin
    Clipboard.Clear;
End;

Procedure TMainForm.EditCChange(Sender: TObject);
Begin
    EditC.MaxLength := 6;
    If Length(EditC.Text) = 0 Then
    Begin
        Result.Lines.Clear;
    End;
End;

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

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

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

Procedure TMainForm.EditCMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
Begin
    Clipboard.Clear;
End;

Procedure TMainForm.EditDChange(Sender: TObject);
Begin
    EditD.MaxLength := 6;
    If Length(EditD.Text) = 0 Then
    Begin
        Result.Lines.Clear;
    End;
End;

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

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

        if Key = '0' then // Проверяем знак минус
begin
  BalloonHint1.Title := 'Недопустимый символ.';
  BalloonHint1.Description := 'Здесь можно ввести только число неравное 0.';
  BalloonHint1.ImageIndex := 1;
  BalloonHint1.ShowHint(EditD);
  Key := #0;
end;

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

Procedure TMainForm.EditDMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
Begin
    Clipboard.Clear;
End;

Procedure TMainForm.EditRadMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
Begin
    Clipboard.Clear;
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.FormMouseEnter(Sender: TObject);
Begin
    Clipboard.Clear;
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);
Begin
    EditA.MaxLength := 6;
    If Length(EditA.Text) = 0 Then
    Begin
        Result.Lines.Clear;
    End;
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.EditAMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
Begin
    Clipboard.Clear;
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, Errors, A, B, C, D, 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 <> 4 Then
                Fail := True;
        End;

        If IsCorrect Then
        Begin
            Reset(FileElem);

            Try
                Readln(FileElem, A);
                StrToInt(A);
            Except
                Fail := True;
            End;

            Try
                Readln(FileElem, B);
                StrToInt(B);
            Except
                Fail := True;
            End;
            Try
                Readln(FileElem, C);
                StrToInt(C);
            Except
                Fail := True;
            End;

            Try
                Readln(FileElem, D);
                StrToInt(D);
            Except
                Fail := True;
            End;
        End;
    Finally
        CloseFile(FileElem);
        ShowMessage('Обработка завершена');
    End;

    If Fail = False Then
    Begin
        If ((-99 > StrToFloat(A)) Or (StrToFloat(A) > 999)) Or ((-99 > StrToFloat(B)) Or (StrToFloat(B) > 999)) Then
            Fail := True;
    End;

    Errors := 'Проверьте введенные данные и повторите попытку!';
    If Fail = True Then
    Begin
        ShowMessage(Errors);
    End
    Else
    Begin
        EditA.Text := A;
        EditB.Text := B;
        EditC.Text := C;
        EditD.Text := D;
    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.