Deck 3: Introduction to Classes, Objects and Strings

Question 1

C++ Standard Library function getline, from the header, reads characters up to, but not including, a(n)________ (which is discarded), then places the characters in a string.

A) tab
B) period
C) newline
D) \

Answer 1

C

Question 2

A header file is typically given the filename extension:

A) .h
B) .hdr
C) .header
D) .cpp

Answer 2

A

Question 3

3.2 Q2. Which of the following statements is false?

A) Class names, member function names and data member names are all identifiers.
B) By convention, variable-name identifiers begin with an uppercase letter, and every word in the name after the first word begins with a capital letter; this naming convention is known as camel case.
C) Also by convention, class names begin with an initial uppercase letter, and member function and data member names begin with an initial lowercase letter.
D) All of the above are true.

Answer 3

B

Question 4

The ________ statement passes a value back to a function's caller.

A) recover
B) restore
C) pass
D) return

Question 5

C++ is a(n) ________ programming language because you can define new class types as needed.

A) strongly typed
B) extensible
C) inextensible
D) None of the above.

Question 6

A main function can "drive" an object by calling its member functions-without knowing how the class is implemented. In this sense, main is referred to as a(n) ________ program.

A) manipulator
B) driver
C) controller
D) operator

Question 7

Each class you create becomes a new ________ you can use to declare variables and create objects.

A) variable
B) object
C) type
D) access modifier

Question 8

The return type ________ indicates that when a function completes its task, it does not return (i.e., give back) any information to its calling function.

A) null
B) virtual
C) nullptr
D) void

Question 9

Which of the following statements is true?

A) The compiler knows about fundamental types that are "built into" C++.
B) A new type that you create is known as a user-defined type.
C) New classes, when packaged properly, can be reused by other programmers.
D) All of the above are true.

Question 10

A member-function call can supply ________ that help the function perform its task.

A) parameters
B) arguments
C) classes
D) frameworks

Question 11

Functions that are not members of a class are called ________ functions.

A) isolated
B) global
C) universal
D) general

Question 12

Assuming that text is a variable of type string, what will be the contents of text after the statement cin >> text; is executed if the user types Hello World! then presses Enter?

A) "H"
B) "Hello"
C) "Hello World"
D) "Hello World!"

Question 13

Typically, you cannot call a member function of a class until you create a(n) ________ of that class.

A) object
B) image
C) header
D) constructor

Question 14

Which of the following statements is true?

A) A class's body is enclosed in an opening left brace and a closing right brace.
B) A class definition terminates with a required semicolon.
C) Typically, each class definition is placed in a separate header with the .h filename extension.
D) All of the above are ture.

Question 15

Which of the following statements is false?

A) The number and order of arguments in a function call must match the number and order of parameters in the function definition's parameter list.
B) Every function body is delimited by an opening left brace and a closing right brace. Within the braces are one or more statements that perform the function's task(s).
C) When program execution reaches a function's closing brace, the function returns to its caller.
D) None of the above is false.

Question 16

Which of the following statements is false?

A) Variables declared in a particular function's body are local variables, which can be used only in that function.
B) When a function terminates, the values of its local variables are preserved.
C) A function's parameters also are local variables of that function.
D) The argument types in the member function call must be consistent with the types of the corresponding parameters in the member function's definition.

Question 17

To call a member function for a specific object, you specify the object's name, followed by a(n) ________, then the member function name and a set of parentheses.

A) dot operator
B) colon
C) ::
D) ->

Question 18

Files ending in .cpp are known as ________ files.

A) executable
B) secure C++
C) source-code
D) class

Question 19

Which of the following statements is false?

A) Each object of a class shares one copy of the class's data members.
B) An object's data members exist before a program calls member functions on an object, while they are executing and after the member functions complete execution.
C) Data members are declared inside a class definition but outside its member functions' bodies.
D) Headers should never contain using directives or using declarations.

Question 20

The default value for a string is ________.

A) null
B) void
C) blanks
D) the empty string

Question 21

Which of the following statements is false?

A) The default constructor does not initialize the class's fundamental-type data members, but does call the default constructor for each data member that's an object of another class.
B) A string's default constructor initializes the object to the empty string.
C) An uninitialized fundamental-type variable is implicitly initialized to zero.
D) If a class defines a constructor, the compiler will not create a default constructor for that class.

Question 22

Which of the following statements is false?

A) Each class can define a constructor for custom object initialization.
B) A constructor is a special member function that must have the same name as the class.
C) C++ requires a constructor call for every object that's created.
D) A constructor cannot specify parameters.

Question 23

Which of the following statements is false?

A) A constructor that specifies a single parameter should be declared implicit.
B) A constructor does not specify a return type, because constructors cannot return values.
C) Constructors cannot be declared const (because initializing an object modifies it).
D) None of the above statements is false.

Question 24

Which of the following statements is false?

A) Variables or functions listed after the public access specifier (and before the next access specifier, if there is one) are "available to the public." They can be used by other functions in the program, and by member functions of other classes.
B) By default, everything in a class is private, unless you specify otherwise.
C) You must list an access specifier for every member.
D) Declaring data members private is known as data hiding. private data members are encapsulated (hidden) in an object and can be accessed only by member functions of the object's class.

Question 25

Normally, constructors are ________.

A) private
B) protected
C) privy
D) public

Question 26

A default constructor has how many parameters?

A) 0.
B) 1.
C) 2.
D) Variable number.

Question 27

A member function that does not, and should not, modify the object on which it's called is declared with ________ to the right of its parameter list.

A) final
B) const
C) firm
D) immutable

Question 28

Which of the following statements is false?

A) Through the use of set and get member functions, you can validate attempted modifications to private data and control how that data is presented to the caller.
B) A client of a class is any other code that calls the class's member functions.
C) Any client code can see a private data member and do whatever it wants with it, including setting it to an invalid value.
D) Tightly controlling the access to and presentation of private data can greatly reduce errors, while increasing the usability, robustness and security of your programs.

Question 29

You can initialize fundamental-type data members in their declarations. This is known as a(n) ________ initializer and was introduced in C++11.

A) explicit
B) implicit
C) global
D) in-class initializer

Question 30

Which of the following statements about UML class diagrams is false?

A) Like operations, the UML models constructors in the third compartment of a class diagram.
B) To distinguish a constructor from the class's operations, the UML requires that the word "constructor" be enclosed in guillemets and placed before the constructor's name.
C) It's customary to list constructors before other operations in the third compartment.
D) All of the above are true.

Question 31

Which of the following statements is false?

A) The keyword private is an access specifier.
B) Access specifiers are always followed by a semicolon (;).
C) A private data member is accessible only to its class's member functions.
D) Most data-member declarations appear after the private access specifier.

Question 32

Which statement about UML class diagrams is true?

A) UML class diagrams can be used to summarize a class's attributes and operations.
B) In the UML, each class is modeled in a class diagram as a rectangle with three compartments.
C) The top compartment contains the class name centered horizontally in boldface type and the middle compartment contains the class's attribute names, which correspond to the data members of a class.
D) All of the above are true.

Question 33

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.