delphi calculator
Delphi Calculator in Delphi Language
To create a calculator in Delphi, you can follow these steps:
- Open Delphi and create a new project.
- Add a
TForm
component to the project. This will serve as the main form for the calculator. - 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.
- Set the properties of the components as needed. For example, you can set the
Caption
property of the number buttons to the corresponding numbers. - 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.
- Compile and run the project to test the calculator.
Here's a simple example of a Delphi calculator implementation:
unit CalculatorForm;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
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
{ Private declarations }
FFirstNumber: Double;
FSecondNumber: Double;
FOperation: Char;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.ButtonNumberClick(Sender: TObject);
begin
Edit1.Text := Edit1.Text + (Sender as TButton).Caption;
end;
procedure TForm1.ButtonOperationClick(Sender: TObject);
begin
FFirstNumber := StrToFloat(Edit1.Text);
FOperation := (Sender as TButton).Caption[1];
Edit1.Text := '';
end;
procedure TForm1.ButtonEqualsClick(Sender: TObject);
begin
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);
end;
end;
procedure TForm1.ButtonClearClick(Sender: TObject);
begin
Edit1.Text := '';
end;
end.
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!