C++ Object-oriented Programming:

28) The Standard Library string class provides, among other features, which of the following? (a) Overloaded operator+ for string concatenating standard strings (b) Overloaded operator+ for concatenating C-string values and standard strings in either order (c) A standalone getline function to fetch an entire line of input into a string (d) All of the above 29) Which of the following statements is correct? (a) A constructor must be declared for each class (b) A constructor must be declared with a return type (c) A default constructor can only be provided by the compiler (d) A class can have only one default constructor 30) A binary operator overloaded using a non-member function has (a) zero parameters one (c) two (d) None of the above 31) Defining a class such that the implementation of the member functions and the implementation of the data are not known (or at least irrelevant) to the programmer using the class is known as? (a) Information hiding (b) Data abstraction (c) Encapsulation (d) All of the above 32) Which of the following statements correctly frees the memory of a dynamic array of doubles pointed to by the pointer p1? (a) delete pl; (b) delete [l pl; (c) free pl; (d) free [I pl