DelphiBasics
Until
Keyword
Ends a Repeat control loop
  Repeat
    Statement1;
  {Statement2;
    ...}
  Until Expression
Description
The Until keyword ends a control loop that is always executed at least once, and which terminates when the Expression is satisfied (returns True).
 
There is no need for Begin or End markers - the Repeat and Until keywords serve that purpose.
 
It is used when it is important that the statements are at least executed once.
Notes
The last Statement need not have a ; terminator - it is entirely optional.
Related commands
Begin Keyword that starts a statement block
Boolean Allows just True and False values
Do Defines the start of some controlled action
End Keyword that terminates statement blocks
For Starts a loop that executes a finite number of times
Repeat Repeat statements until a ternmination condition is met
While Repeat statements whilst a continuation condition is met
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Example code : Display integer squares until we reach or exceed 100
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  SysUtils,
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

var
  num, sqrNum : Integer;

begin
  num := 1;
  sqrNum := num * num;

  // Display squares of integers until we reach 100 in value
  Repeat
    // Show the square of num
    ShowMessage(IntToStr(num)+' squared = '+IntToStr(sqrNum));

    // Increment the number
    Inc(num);

    // Square the number
    sqrNum := num * num;
  Until sqrNum > 100;
end;
 
end.
Hide full unit code
   1 squared = 1
   2 squared = 4
   3 squared = 9
   4 squared = 16
   5 squared = 25
   6 squared = 36
   7 squared = 49
   8 squared = 64
   9 squared = 81
   10 squared = 100
 
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