delphi - while使用方式

var
  num, sqrNum : Integer;
begin
  num := 1;
  sqrNum := num * num;
  // Display squares of integers until we reach 100 in value
  While sqrNum <= 100 do
  begin
    // Show the square of num
    ShowMessage(IntToStr(num)+' squared = '+IntToStr(sqrNum));
    // Increment the number
    Inc(num);
    // Square the number
    sqrNum := num * num;
  end;
end;