problem with accessing value

[Uwe Raabe]

Zitat von question:

Could you please tell me ,how can i create the instance of 'TCalculation'? i am reading some tutorial,but i am not so clear, could you please give me an example ?

Delphi-Quellcode:

var
  f: TCalculation; // declaration
begin
  f := TCalculation.Create; // create instance
  ...