C++ MCQs with answers Page - 57

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Q. The process of building new classes from existing one is called ______.

  • (A) Cascading
  • (B) Inheritance
  • (C) Structure
  • (D) Polymorphism

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Q. If a class C is derived from class B, which is derived from class A, all through public inheritance, then a class C member function can access

  • (A) protected and public data only in C and B.
  • (B) protected and public data only in C.
  • (C) private data in A and B.
  • (D) protected data in A and B.

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Q. If the variable count exceeds 100, a single statement that prints “Too many” is

  • (A) if (count>100) cout << “Too many”;
  • (B) if (count<100) cout << “Too many”;
  • (C) if (count>100) cout >> “Too many”;
  • (D) None of these

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Q. Usually a pure virtual function

  • (A) is defined only in derived class.
  • (B) will be called only to delete an object.
  • (C) will never be called.
  • (D) has complete function body.

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Q. To perform stream I/O with disk files in C++, you should

  • (A) include the IOSTREAM.H header file.
  • (B) use C language library functions to read and write data.
  • (C) use classes derived from ios
  • (D) open and close files as in procedural languages

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Q. . Overloading the function operator

  • (A) usually make use of a constructor that takes arguments.
  • (B) allows you to create objects that act syntactically like functions
  • (C) requires a class with an overloaded [ ] operator.
  • (D) requires a class with an overloaded operator.

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Q. If x = y,5 = 2 then x ∧ y equals________. (where ∧ is a bitwise XOR operator)

  • (A) 11001000
  • (B) 10100000
  • (C) 10000010
  • (D) 00000111

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Q. What will be the result of the expression 13 & 25?

  • (A) 9
  • (B) 12
  • (C) 25
  • (D) 38

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Q. Which of the following operator can be overloaded through friend function?

  • (A) *
  • (B) ( )
  • (C) =
  • (D) ->

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Q. To access the public function fbase() in the base class, a statement in a derived class function fder() uses the statement.fbase();

  • (A) der::fder();
  • (B) base::fbase();
  • (C) fder();
  • (D) fbase();

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