Question 1

A constructor can specify the return type:
A) int.
B) string.
C) void.
D) A constructor cannot specify a return type.

Accepted Answer

Constructors do not have a return type. Their purpose is to create and initialize objects, not to return a value.

Question 2

Which of the following preprocessor directives does not constitute part of the preprocessor wrapper?
A) #define
B) #endif
C) #ifndef
D) #include

Accepted Answer

#include is a preprocessor directive used to include files in the program, but it is not part of the preprocessor wrapper. The preprocessor wrapper typically involves conditional compilation directives like #ifndef, #define, and #endif to prevent double inclusion of header files.

Question 3

Member function definitions:
A) Always require the binary scope operator ::).
B) Require the binary scope operator only when being defined outside of the definition of their class.
C) Can use the binary scope operator anywhere, but become public functions.
D) Must use the binary scope operator in their function prototype.

Accepted Answer

Member functions being defined inside the definition of their class do not require the binary scope operator. However, when being defined outside of the class definition, they require the binary scope operator to indicate which class they belong to. The use of the binary scope operator does not affect their access specifier (public, private, protected).

Question 4

In the source-code file containing a class's member function definitions, each member function definition must be tied to the class definition by preceding the member function name with the class name and ::, which is known as the:
A) Member definition linker.
B) Class implementation connector.
C) Source code resolver.
D) Binary scope resolution operator.

Accepted Answer

The binary scope resolution operator (::) is used to tie the class definition with its member function definitions in the source-code file. It specifies the scope to which the member function belongs and separates the class name from the function name.

Question 5

The compiler will implicitly create a default constructor if:
A) The class does not contain any data members.
B) The programmer specifically requests that the compiler do so.
C) The class does not define any constructors.
D) The class already defines a default constructor.

Accepted Answer

The compiler will only implicitly create a default constructor if the class does not define any constructors. If the class defines any constructor, including a default constructor, then the compiler will not create one implicitly. Option A is incorrect because the presence or absence of data members does not affect the implicit creation of default constructors. Option B is also incorrect because there is no explicit request to the compiler for creating a default constructor. Option D is incorrect because the question refers to the implicit creation of a default constructor, not the explicit definition of one.

Question 6

Variables defined inside a member function of a class have:
A) File scope.
B) Class scope.
C) Block scope.
D) Class or block scope, depending on whether the binary scope resolution operator ::) is used.

Accepted Answer

Variables defined inside a member function of a class have block scope, meaning they are only accessible within the curly braces of the function. They do not have class or file scope unless explicitly declared as such with the appropriate keywords.

Question 7

Calling a member function of an object requires which item?
A) The dot operator.
B) Open and close braces.
C) The class name.
D) None of the above.

Accepted Answer

The dot operator (.) is used to call a member function of an object in C++.

Question 8

A header file is typically given the filename extension:
A) .h
B) .hdr
C) .header
D) .cpp

Accepted Answer

The typical filename extension for a header file is .h. This convention is widely used in the C and C++ programming languages.

Question 9

Classes cannot:
A) Be derived from other classes.
B) Initialize data members in the class definition.
C) Be used to model attributes and behaviors of objects.
D) Include objects from other classes as members.

Accepted Answer

Classes cannot initialize data members in the class definition. They can only declare them.

Question 10

When a client code programmer uses a class whose implementation is in a separate file from its interface, that implementation code is merged with the client's code during the:
A) Programming phase.
B) Compiling phase.
C) Linking phase.
D) Executing phase.

Accepted Answer

During the linking phase, the implementation code is combined with the client's code to create an executable program.

Question 11

Member access specifiers public and private) can appear:
A) In any order and multiple times.
B) In any order public first or private first) but not multiple times.
C) In any order and multiple times, if they have brackets separating each type.
D) Outside a class definition.

Accepted Answer

Member access specifiers in C++ (public and private) can appear in any order within a class definition and can be used multiple times to change the access level of the members that follow.

Question 12

Parameterized stream manipulator setfill specifies the fill character that's displayed when an output is displayed in a field wider than the number of characters or digits in the output. The effect of setfill applies:
A) Only to the current value being displayed.
B) Only to outputs displayed in the current statement.
C) Until explicitly set to a different setting.
D) Until the output buffer is flushed.

Accepted Answer

Setfill specifies a global setting for the fill character and applies until explicitly changed to a different setting. It can affect multiple outputs across multiple statements until it's changed.

Question 13

Assuming that Grades.h is found in the current directory and the iostream header file is found in the C++ Standard Library header file directory, which of the following preprocessor directives will fail to find its desired header file? A) #include B) #include "iostream" C) #include D) #include "Grades.h"

Accepted Answer

The directive #include <Grades.h> will fail because it searches for Grades.h in the standard library directories, not the current directory where it is located.

Question 14

Attributes of a class are also known as:
A) Constructors.
B) Local variables.
C) Data members.
D) Classes.

Accepted Answer

Attributes of a class are also known as data members. Constructors are special methods used to initialize objects, local variables are variables declared within a method or block of code, and classes are templates used to create objects.

Question 15

When compiling a class's source code file which does not contain a main function), the information in the class's header file is used for all of the following, except:
A) Ensuring that the header of each member function matches its prototype.
B) Ensuring that each member function knows about the class's data members and other member functions.
C) Determining the correct amount of memory to allocate for each object of the class.
D) All of the above are uses that the compiler has for the header file information.

Accepted Answer

The answer of When compiling a class's source code file...

Question 16

A class-scope variable hidden by a block-scope variable can be accessed by preceding the variable name with the class name followed by:
A) ::
B) :
C) .
D) ->

Accepted Answer

The scope resolution operator :: is used to access class-level variables that have been hidden by a variable with the same name in a block scope. This operator explicitly tells the compiler which variable to access.

Question 17

A default constructor has how many parameters?
A) 0.
B) 1.
C) 2.
D) Variable number.

Accepted Answer

A default constructor has no parameters, which means it can be called without any arguments.

Question 18

All of the following are true about classes, except:
A)Classes have attributes and behaviors.
B)The first class in any C++ program is main.
C)An object must be created from a class before it can be used.
D)A class's functions hide from the user the complex tasks they perform.

Accepted Answer

The first class in a C++ program is not necessarily main, it can be any class defined by the programmer.

Question 19

In the UML, the top compartment of the rectangle modeling a class contains:
A) The class's name.
B) The class's attributes.
C) The class's behaviors.
D) All of the above.

Accepted Answer

The top compartment of the rectangle modeling a class contains the class's name only. The attributes and behaviors are shown in the second and the third compartment respectively.

Question 20

Every object of the same class:
A) Gets a copy of every member function and member variable.
B) Gets a copy of every member variable.
C) Gets a copy of every member function.
D) Shares pointers to all member variables and member functions.

Accepted Answer

Every object of the same class gets a copy of every member variable but not every member function. Member functions of a class are common for all the objects of that class and are shared through a single copy.

Quiz 9: Classes

A constructor can specify the return type:

Which of the following preprocessor directives does not constitute part of the preprocessor wrapper?

Member function definitions:

In the source-code file containing a class's member function definitions, each member function definition must be tied to the class definition by preceding the member function name with the class name and ::, which is known as the:

The compiler will implicitly create a default constructor if:

Variables defined inside a member function of a class have:

Calling a member function of an object requires which item?

A header file is typically given the filename extension:

Classes cannot:

When a client code programmer uses a class whose implementation is in a separate file from its interface, that implementation code is merged with the client's code during the:

Member access specifiers public and private) can appear:

Parameterized stream manipulator setfill specifies the fill character that's displayed when an output is displayed in a field wider than the number of characters or digits in the output. The effect of setfill applies:

Assuming that Grades.h is found in the current directory and the iostream header file is found in the C++ Standard Library header file directory, which of the following preprocessor directives will fail to find its desired header file?

Attributes of a class are also known as:

When compiling a class's source code file which does not contain a main function) , the information in the class's header file is used for all of the following, except:

A class-scope variable hidden by a block-scope variable can be accessed by preceding the variable name with the class name followed by:

A default constructor has how many parameters?

All of the following are true about classes, except:

In the UML, the top compartment of the rectangle modeling a class contains:

Every object of the same class: