How to return exit code such as exit() function in C/C++ ?

You can return exit code in delphi by following method:
 

var
  i : Integer;
begin
  // Set up an error address so that halt shows a termination dialog
  ErrorAddr := Addr(i);

  // Set the program exit code
  ExitCode := 8;
end;

As you can see above, you can set exit code by ExitCode variable. That is global variable indicating exit code.