Question 1

If a derived class inherits from two base classes that both define a certain member function, then an ambiguity problem will arise when:&#10;A) An object of a base class calls that certain member function.&#10;B) An object of the derived class calls that certain member function.&#10;C) A pointer of a base class type pointing to an object of the derived class calls that certain member function.&#10;D) None of the above.

Accepted Answer

If an object of a derived class calls that certain member function, then the compiler will not know which base class implementation of the function to use, leading to an ambiguity error. This can be resolved by explicitly specifying which implementation to use or by creating a new implementation in the derived class.

Question 2

Which symbol is used to access class members via pointers to class members?&#10;A) ->&#10;B) .*&#10;C) .&#10;D) *.

Accepted Answer

B

Question 3

Individual namespace members can be accessed without a namespace qualifier:&#10;A) If the using namespace all; directive is included at the beginning of the file.&#10;B) At any time.&#10;C) Only if the namespace is declared inside of main.&#10;D) If the individual member is mentioned in a using namespace::namespacemember declaration.

Accepted Answer

Only individual namespace members that are explicitly mentioned in a using namespace::namespacemember declaration can be accessed without a namespace qualifier. Other options may cause namespace collisions or unintended consequences.

Question 4

____________ namespace members appear to occupy the ___________ namespace and do not have to be qualified with a namespace name.&#10;A) Global, unnamed.&#10;B) Unnamed, global.&#10;C) Named, static.&#10;D) Named, global.

Accepted Answer

Unnamed namespace members occupy the unnamed namespace, which is a global namespace but without a name. Thus, they do not have to be qualified with a namespace name.

Question 5

Multiple inheritance means that a derived class inherits the members of several:&#10;A) Derived classes.&#10;B) public classes.&#10;C) Direct base classes.&#10;D) Indirect base classes, but exactly one direct base class.

Accepted Answer

Multiple inheritance in C++ allows a derived class to inherit the members of several direct base classes. It is not limited to just one direct base class, and the inheritances can be combined in any way. In contrast, a derived class can only inherit from one base class in single inheritance.

Question 6

Without the statement __________, all __________ statements must be written as std::cout.&#10;A) using namespace std;, cout&#10;B) using std namespace;, cout&#10;C) using std::namespace;, cout&#10;D) using std;, namespace std::cout

Accepted Answer

The statement "using namespace std;" is necessary in order to avoid having to write "std::" before each use of cout, as well as other standard library objects and functions. Allowing namespace std makes it easier and more efficient to write code.

Question 7

Assuming that ptr is a pointer to a class data member of class Check and obj is a pointer to a Check object, which of the following statements would be used to output that data member? A) cout << obj.*ptr; B) cout << *obj ).*ptr; C) cout << obj->*ptr); D) cout << *obj )->*ptr;

Accepted Answer

Option B uses the correct syntax to access a class data member through a pointer to an object. The parentheses around the pointer to the object (*obj) are necessary since the dot operator (.) has higher precedence than the pointer dereference operator (*). The dot operator is used to access the member of the object pointed to by obj. The parentheses around (*obj) ensure that the pointer dereference operation is applied first to get the object being pointed to, and then the dot operator is applied to access the member pointed to by ptr.

Question 8

__________ inheritance solves the problem of duplicate subobjects.&#10;A) protected&#10;B) virtual&#10;C) const&#10;D) static

Accepted Answer

Virtual inheritance allows for a shared base class to be inherited by multiple derived classes without creating multiple copies of the shared base class. This solves the problem of duplicate subobjects.

Question 9

The const_cast operator can be used to cast away ___________ or ____________ qualifications.&#10;A) const, volatile.&#10;B) The const-ness property, remove.&#10;C) Property, const.&#10;D) enum, #define.

Accepted Answer

The const_cast operator can be used to cast away const or volatile qualifications.

Question 10

If a certain object's data members need to be frequently modified by const functions, it is best to:&#10;A) Declare the member values non-const.&#10;B) Declare the member values mutable.&#10;C) Use const_cast to make the member values modifiable.&#10;D) Use static_cast to make the member values modifiable.

Accepted Answer

Declaring the member values as mutable allows them to be modified by const functions without violating the const qualification of the function itself. This is the recommended approach for cases where frequent modification of member values is required within const functions.

Question 11

Duplicate __________ could result from ___________.&#10;A) subobjects, multiple inheritance.&#10;B) superobjects, multiple inheritance.&#10;C) superclasses, downcasting a pointer.&#10;D) subclasses, upcasting a pointer.

Accepted Answer

The answer of Duplicate __________ could result from ___________.&#10;A) subobjects,...

Question 12

The const_cast operator is needed when __________ data must be treated as ___________ data.&#10;A) const, const&#10;B) Non-const, const&#10;C) const, non-const&#10;D) Non-const, non-const

Accepted Answer

The answer of The const_cast operator is needed when __________...

Question 13

Which operator keyword corresponds to ^?&#10;A) xor&#10;B) xor_eq&#10;C) or&#10;D) or_eq

Accepted Answer

The answer of Which operator keyword corresponds to ^?&#10;A) xor&#10;B)...

Question 14

Namespace definitions are different from class definitions because:&#10;A) namespace definitions do not end in semicolons.&#10;B) namespace definitions are not delimited by braces {}.&#10;C) namespaces cannot contain functions.&#10;D) namespaces cannot contain variables.

Accepted Answer

The answer of Namespace definitions are different from class definitions...

Question 15

Which operator corresponds to operator keyword and_eq?&#10;A) &&&#10;B) !=&#10;C) &&#10;D) &=

Accepted Answer

The answer of Which operator corresponds to operator keyword and_eq?&#10;A)...

Question 16

___________ is/are used to solve the problem of variables with the same name and overlapping scopes.&#10;A) namespaces.&#10;B) Classes.&#10;C) Casts.&#10;D) Dynamic memory allocation.

Accepted Answer

The answer of ___________ is/are used to solve the problem...

Question 17

For multiple inheritance, the ______________ is responsible for initializing the _________ base class.&#10;A) Most derived class, virtual&#10;B) Least derived class, virtual&#10;C) Most derived class, const&#10;D) First derived class, virtual

Accepted Answer

The answer of For multiple inheritance, the ______________ is responsible...

Question 18

Namespaces cannot contain:&#10;A) Any functions.&#10;B) main.&#10;C) Classes.&#10;D) Other namespaces.

Accepted Answer

The answer of Namespaces cannot contain:&#10;A) Any functions.&#10;B) main.&#10;C) Classes.&#10;D)...

Question 19

Which of the following declares a pointer ptr to a class member function in class Check that takes an int argument and returns a bool?&#10;A) bool: int ) *Check::ptr );&#10;B) Check:: bool *ptr ) int ) );&#10;C) bool Check::*ptr ) int );&#10;D) bool* int ) Check::ptr;

Accepted Answer

The answer of Which of the following declares a pointer...

Deck 24: Other Topics