unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    Button9: TButton;
    Button10: TButton;
    Button11: TButton;
    Button12: TButton;
    Button13: TButton;
    Button14: TButton;
    Button15: TButton;
    Button16: TButton;
    Button17: TButton;
    Button18: TButton;
    Button19: TButton;
    Button20: TButton;
    Button21: TButton;
    Button22: TButton;
    Button23: TButton;
    Button24: TButton;
    Button25: TButton;
    Button26: TButton;
    Button27: TButton;
    Button28: TButton;

    procedure Button3Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
    procedure Button10Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button12Click(Sender: TObject);
    procedure Button13Click(Sender: TObject);
    procedure Button14Click(Sender: TObject);
    procedure Button15Click(Sender: TObject);
    procedure Button16Click(Sender: TObject);
    procedure Button17Click(Sender: TObject);
    procedure Button18Click(Sender: TObject);
    procedure Button19Click(Sender: TObject);
    procedure Button20Click(Sender: TObject);
    procedure Button21Click(Sender: TObject);
    procedure Button22Click(Sender: TObject);
    procedure Button23Click(Sender: TObject);
    procedure Button24Click(Sender: TObject);
    procedure Button26Click(Sender: TObject);
    procedure Button25Click(Sender: TObject);
    procedure Button27Click(Sender: TObject);
    procedure Button28Click(Sender: TObject);
    procedure Button29Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  sum, y: real;
  c1: char;

implementation

{$R *.dfm}

procedure TForm1.Button10Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '-';
end;

procedure TForm1.Button11Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '+';
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '1';
end;

procedure TForm1.Button20Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'ctg';
end;

procedure TForm1.Button21Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'arcsin';
end;

procedure TForm1.Button22Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'arccos';
end;

procedure TForm1.Button23Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'arctan';
end;

procedure TForm1.Button24Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'arcctg';
end;

procedure TForm1.Button25Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'sqrt';
end;

procedure TForm1.Button26Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'sqr';
end;

procedure TForm1.Button27Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'exp';
end;

procedure TForm1.Button28Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'ln';
end;

procedure TForm1.Button29Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'abs';
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '2';
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '3';
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '4';
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '5';
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '6';
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '7';
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '8';
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '9';
end;

procedure TForm1.Button12Click(Sender: TObject);
var
  s, s1, sf: string;
  c: char;
  x: real;
  i, k: integer;
begin
  s := Edit1.text;
  k := 0;
  for i := 1 to Length(s) do
  begin
    c := s[i];
    case c of
      '0' .. '9':
        s1 := s1 + c;
      'a' .. 'z':
        sf := sf + c;

      '+':
        begin
          y := strtofloat(s1);
          if k > 0 then
          begin
            case c1 of
              '1':
                begin
                  sum := sum + y;
                end;
              '2':
                begin
                  sum := sum - y;
                end;
              '3':
                begin
                  sum := sum * y;
                end;
              '4':
                begin
                  sum := sum / y;
                end;
            end;
          end
          else
          begin
            sum := y;
            k := 1;
          end;
          s1 := ' ';
          k := 1;
          c1 := '1';
        end;
      '-':
        begin
          y := strtofloat(s1);
          if k > 0 then
          begin
            case c1 of
              '1':
                begin
                  sum := sum + y;
                end;
              '2':
                begin
                  sum := sum - y;
                end;
              '3':
                begin
                  sum := sum * y;
                end;
              '4':
                begin
                  sum := sum / y;
                end;
            end;
          end
          else
          begin
            sum := y;
            k := 1;
          end;
          s1 := ' ';
          c1 := '2';
        end;
      '*':
        begin
          y := strtofloat(s1);
          if k <> 0 then
          begin
            case c1 of
              '1':
                begin
                  sum := sum + y;
                end;
              '2':
                begin
                  sum := sum - y;
                end;
              '3':
                begin
                  sum := sum * y;
                end;
              '4':
                begin
                  sum := sum / y;
                end;
            end;
          end
          else
          begin
            sum := y;
            k := 1;
          end;
          s1 := ' ';
          c1 := '3';
        end;
      '/':
        begin
          y := strtofloat(s1);
          if k <> 0 then
          begin
            case c1 of
              '1':
                begin
                  sum := sum + y;
                end;
              '2':
                begin
                  sum := sum - y;
                end;
              '3':
                begin
                  sum := sum * y;
                end;
              '4':
                begin
                  sum := sum / y;
                end;
            end;
          end
          else
          begin
            sum := y;
            k := 1;
          end;
          s1 := ' ';
          c1 := '4';
        end;
    end;
  end;
  y := strtofloat(s1);
  case c1 of
    '1':
      begin
        sum := sum + y;
      end;
    '2':
      begin
        sum := sum - y;
      end;
    '3':
      begin
        sum := sum * y;
      end;
    '4':
      begin
        sum := sum / y;
      end;
  end;

  if sf = 'sin' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := sin(x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'cos' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := cos(x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'tan' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := sin(x) / cos(x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'ctg' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := cos(x) / sin(x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'arcsin' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := Arctan(x / Sqrt(1 - sqr(x)));;
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'arccos' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := Arctan(Sqrt(1 - sqr(x)) / x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'arctan' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := Arctan(x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'arcctg' then
  begin
    y := strtofloat(s1);
    x := degtorad(y);
    sum := 1 / Arctan(x);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'sqr' then
  begin
    y := strtofloat(s1);
    sum := y * y;
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'sqrt' then
  begin
    y := strtofloat(s1);
    sum := Sqrt(y);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'ln' then
  begin
    y := strtofloat(s1);
    sum := ln(y);
    sf := ' ';
    s1 := ' ';
  end;
  if sf = 'exp' then
  begin
    y := strtofloat(s1);
    sum := exp(y);
    sf := ' ';
    s1 := ' ';
  end;
  Edit1.text := Edit1.text + '=' + floattostr(sum);
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
  Edit1.text := ' ';
end;

procedure TForm1.Button14Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '*';
end;

procedure TForm1.Button15Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '/';
end;

procedure TForm1.Button16Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + '0';
end;

procedure TForm1.Button17Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'sin';
end;

procedure TForm1.Button18Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'cos';
end;

procedure TForm1.Button19Click(Sender: TObject);
begin
  Edit1.text := Edit1.text + 'tan';
end;

end.