Código:
unit Unit1; {$mode objfpc}{$H+} interface uses Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, StdCtrls; type { TForm1 } TForm1 = class(TForm) Calcular: TButton; Apagar: TButton; Edit1: TEdit; Edit2: TEdit; Edit3: TEdit; Sair: TButton; procedure ApagarClick(Sender: TObject); procedure CalcularClick(Sender: TObject); procedure SairClick(Sender: TObject); private { private declarations } public { public declarations } end; var Form1: TForm1; implementation { TForm1 } procedure TForm1.CalcularClick(Sender: TObject); var n1,n2,resultado:real;//n1(numero1),n2(numero2),resultado(resultado do calculo) begin n1:=StrToFloat(Edit1.text); n2:=StrToFloat(Edit2.text); resultado:=n1*n2/12; Edit3.text:=FloatToStr(resultado); end; procedure TForm1.SairClick(Sender: TObject); begin Form1.Close; end; procedure TForm1.ApagarClick(Sender: TObject); begin Edit1.text:=''; Edit2.text:=''; Edit3.Text:=''; end; initialization {$I unit1.lrs} end.