Node:while, Next:with, Previous:Void, Up:Reference

### while

#### Synopsis

    while boolean_expression do
      statement

#### Description

The `while` statement declares a loop. For further description see while Statement.

#### Conforming to

`while` is defined in ISO 7185 Pascal and supported by all known Pascal variants.

#### Example

    program WhileDemo;
    var
      Foo, Bar: Integer;
    begin
      WriteLn ('Enter an descending series of integer numbers.');
      WriteLn ('Terminate by breaking this rule.');
      WriteLn ('Enter start number: ');
      Bar := MaxInt;
      ReadLn (Foo);
      while Foo < Bar do
        begin
          Bar := Foo;
          ReadLn (Foo)
        end;
      WriteLn ('The last number of your series was: ', Bar)
    end.

#### See also

Keywords, repeat Statement, for Statement.