Showing posts with label reverse a number in delphi. Show all posts
Showing posts with label reverse a number in delphi. Show all posts

Saturday, October 8, 2016

Reverse a Number in Delphi

I wrote a simple program in Delphi that will ask the user to give a series of number and then our program will reverse the arrangement of the given number by the user.

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Sample Program Output


Program Listing

unit reverse;

interface

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

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

var
  Form1: TForm1;

implementation

{$R *.DFM}


Var value : String;


function ReverseString(const s: string): string; 
var 
  i, len: Integer; 
begin
  len := Length(s);
  SetLength(Result, len); 
  for i := len downto 1 do 
  begin 
    Result[len - i + 1] := s[i]; 
  end; 
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
 value:=Edit1.text;
 label5.caption := 'The reversed equivalent is '
                   + ReverseString(value) + '.';

end;

procedure TForm1.Button2Click(Sender: TObject);
begin
edit1.text     :='';
label5.caption := '';
edit1.setfocus;
end;

end.