Sunday, April 27, 2025
Saturday, April 26, 2025
Tuesday, April 22, 2025
Subtract Two Numbers in Delphi
A simple program that I wrote using Delphi to subtract two numbers.
Program Listing
unit subtract;
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;
Edit1: TEdit;
Edit2: TEdit;
Button1: TButton;
Label3: TLabel;
Button2: TButton;
Button3: TButton;
Button4: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
Number1, Number2, Result: Double;
begin
// Convert input strings to numbers
Number1 := StrToFloat(Edit1.Text);
Number2 := StrToFloat(Edit2.Text);
// Perform subtraction
Result := Number1 - Number2;
// Display result
Label3.Caption := 'The difference between ' + FloatToStr(Number1)
+ ' and '+ FloatToStr(Number2) + ' is ' + FloatToStr(Result) + '.';
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
edit1.Text := '';
edit2.Text := '';
label3.Caption := '';
edit1.SetFocus;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
if MessageDlg('Are you sure you want to close this program', mtConfirmation,
[mbYes, mbNo], 0) = mrYes then
begin
Close; // This will unload/close the form
end
else
begin
edit1.Text := '';
edit2.Text := '';
label3.Caption := '';
edit1.SetFocus;
end;
end;
procedure TForm1.Button4Click(Sender: TObject);
begin
// Show message box with custom icon
Application.MessageBox(
'Created By Dr. Jake Rodriguez Pomperada,PHD-TM',
'About this program',
MB_OK + MB_ICONINFORMATION
);
end;
end.