Answer / Ankit Porwal

An inclusion guard is a mechanism used to prevent multiple inclusions of the same header file in a C++ program. It consists of preprocessor directives that check whether the header file has already been included, and if it has not, include the contents of the header file. Inclusion guards typically use conditional compilation to avoid multiple inclusions.

class professor {}; class teacher : public virtual professor {}; class researcher : public virtual professor {}; class myprofessor : public teacher, public researcher {}; Referring to the sample code above, if an object of class "myprofessor" were created, how many instances of professor will it contain? a) 0 b) 1 c) 2 d) 3 e) 4

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