delphi calculator

Delphi Calculator in Delphi Language

To create a calculator in Delphi, you can follow these steps:

  1. Open Delphi and create a new project.
  2. Add a TForm component to the project. This will serve as the main form for the calculator.
  3. Add the necessary components to the form, such as buttons for numbers and operations, an edit box to display the result, and any other components you may need.
  4. Set the properties of the components as needed. For example, you can set the Caption property of the number buttons to the corresponding numbers.
  5. Write the event handlers for the button clicks. For example, when a number button is clicked, you can append the corresponding number to the edit box. When an operation button is clicked, you can perform the corresponding operation on the numbers entered and display the result in the edit box.
  6. Compile and run the project to test the calculator.

Here's a simple example of a Delphi calculator implementation:

unit CalculatorForm;


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

  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    Button9: TButton;
    Button0: TButton;
    ButtonAdd: TButton;
    ButtonSubtract: TButton;
    ButtonMultiply: TButton;
    ButtonDivide: TButton;
    ButtonEquals: TButton;
    ButtonClear: TButton;
    procedure ButtonNumberClick(Sender: TObject);
    procedure ButtonOperationClick(Sender: TObject);
    procedure ButtonEqualsClick(Sender: TObject);
    procedure ButtonClearClick(Sender: TObject);
    { Private declarations }
    FFirstNumber: Double;
    FSecondNumber: Double;
    FOperation: Char;
    { Public declarations }

  Form1: TForm1;


{$R *.dfm}

procedure TForm1.ButtonNumberClick(Sender: TObject);
  Edit1.Text := Edit1.Text + (Sender as TButton).Caption;

procedure TForm1.ButtonOperationClick(Sender: TObject);
  FFirstNumber := StrToFloat(Edit1.Text);
  FOperation := (Sender as TButton).Caption[1];
  Edit1.Text := '';

procedure TForm1.ButtonEqualsClick(Sender: TObject);
  FSecondNumber := StrToFloat(Edit1.Text);
  case FOperation of
    '+': Edit1.Text := FloatToStr(FFirstNumber + FSecondNumber);
    '-': Edit1.Text := FloatToStr(FFirstNumber - FSecondNumber);
    '': Edit1.Text := FloatToStr(FFirstNumber  FSecondNumber);
    '/': Edit1.Text := FloatToStr(FFirstNumber / FSecondNumber);

procedure TForm1.ButtonClearClick(Sender: TObject);
  Edit1.Text := '';


This example uses a TEdit component to display the result and TButton components for the number buttons, operation buttons, and other buttons. The event handlers for the button clicks perform the necessary calculations and update the TEdit component accordingly.

Please note that this is a basic example and may not include all the features you might want in a calculator. You can customize and enhance it according to your requirements.

I hope this helps!