Compare the contents of this CXlOper with another
[C++]
int Compare(
   const CXlOper& xlo
) const;
An initialised XLOPER, or a reference to CXlOper.
Returns 1 if the value in this object is greater than that in xlo, 
            -1 if xlo is less and 0 if the two are equal.
This function acts like strcmp() and similar 'C' library functions. Note that CXlOpers are sorted by type first and then value. 
            Thus a string containing "123" will not necessarily sort later than an 
            integer containing 122. 
            For CXlOpers of the same type, sort order is always by value.
Header: xllplus.h