Delphi

unit electricity_consumption;

interface

uses

  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,

  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type

  TForm1 = class(TForm)

    Label1: TLabel;

    Label2: TLabel;

    Label3: TLabel;

    Label4: TLabel;

    Edit1: TEdit;

    Edit2: TEdit;

    Edit3: TEdit;

    Button1: TButton;

    Label5: TLabel;

    Label6: TLabel;

    Button2: TButton;

    Button3: TButton;

    Label7: TLabel;

    Label8: TLabel;

    Label9: TLabel;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

   var

      Wa,Wh,h, sum, sum2 :String;

      Watt_int,Kwh_int,h_int:real;

  begin

     Wa :=edit1.Text;

     Wh :=edit2.Text;

     h  :=edit3.Text;

     Watt_int:=strTofloat(Wa);

     Kwh_int:=strTofloat(Wh);

     h_int:=strTofloat(h);

     sum:=floatTostr(((Watt_int*Kwh_int)/1000)*h_int);

     sum2:=floatTostr((Watt_int/1000)*h_int);

     Label5.caption:=sum;

     Label7.caption:=sum2;

     end;

procedure TForm1.Button2Click(Sender: TObject);

begin

close;

end;

procedure TForm1.Button3Click(Sender: TObject);

begin

    edit1.Text:=’ ‘ ;

    edit2.Text:=’ ‘ ;

    edit3.Text:=’ ‘ ;

    Label5.caption:=’ ‘;

    Label7.caption:=’ ‘;

end;

end.