Get Excel's calculation mode
[C++]
static int GetCalculationMode();
The function returns a number from 1 to 3 indicating the type of calculation:- 
			1=Automatic; 2=Automatic except tables; 3=Manual.
Header: xllplus.h
CXllApp Class 
					  | CXllApp Methods			 
					  | CXllApp::SetCalculationMode