Showing posts with label Addition and Difference in Delphi. Show all posts
Showing posts with label Addition and Difference in Delphi. Show all posts

Sunday, January 6, 2019

Addition and Difference in Delphi

Here is a simple program to perform addition and subtraction in Delphi. I used Delphi 7 Enterprise edition in writing this program. 

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Program Listing

unit add_differece;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Label6: TLabel;
    Label7: TLabel;
    Label8: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
   
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
var a,b : integer;

procedure TForm1.Button1Click(Sender: TObject);
begin
a:= strtoint(edit1.text);
b:= strtoint(edit2.text);
label6.caption := 'The sum of ' + inttostr(a) + ' and ' +inttostr(b) + ' is ' +inttostr(a+b) + '.';
label7.caption := 'The difference of ' + inttostr(a) + ' and ' +inttostr(b) + ' is ' +inttostr(a-b) + '.';
end;


procedure TForm1.Button2Click(Sender: TObject);
begin
edit1.text := '';
edit2.text := '';
label6.caption :='';
label7.caption :='';
edit1.SetFocus;

end;


procedure TForm1.Button3Click(Sender: TObject);
begin
    if MessageDlg('Do you want to quit this program?', mtConfirmation, [mbYes, mbNO], 0) = mrYes then
begin
form1.Close;
end
else
begin
edit1.SetFocus;
end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin

end;

end.