Question 1

A method SetName might declare a parameter accountName to receive a new name to store in an Account object-a set accessor uses the implicitly declared keyword parameter for the same purpose.

Accepted Answer

A) True 
 B)False

Question 2

Keyword get is a ________ keyword,because it's a keyword only in a property's body-elsewhere,get can be used as an identifier.

Accepted Answer

A)  restricted 
B)  dependent 
C)  contextual 
D)  contingent

Question 3

The property notation allows the client to directly manipulate the private instance variable.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following statements is false

Accepted Answer

A)  A decimal instance variable is initialized to zero by default. 
B)  By default, a property's get and set accessors have the same access as the property. 
C)  A property's get and set accessors must have the same access modifiers. 
D)  We can declare a Balance property's set accessor private to indicate that it may be used only within its class, but not by the class's clients.

Question 5

Local variables are initialized to their default values.

Accepted Answer

A) True 
 B)False

Question 6

Most instance variables are declared ________.

Accepted Answer

A)  public 
B)  protected 
C)  private 
D)  None of the above.

Question 7

Consider the code:
MyAccount.SetName(theName);
Which of the following statements is false

Accepted Answer

A)  When this method executes, the argument value in the call's parentheses (i.e., the value stored in theName) is copied into the corresponding parameter in the method's header. 
B)  Each parameter must specify a type followed by a parameter name. When there are multiple parameters, they are placed in a comma-separated list. 
C)  The number and order of arguments in a method call must match the number and order of parameters in the method declaration's parameter list. 
D)  All of the above are true.

Question 8

Which of the following statements is false

Accepted Answer

A)  Set and Get methods can validate attempts to modify private data and control how that data is presented to the caller, respectively. 
B)  If an instance variable were public, any client of the class could see the data and modify it, including setting it to an invalid value. 
C)  public data allows client-code programmers to write code that depends on the class's data format. If the class's owner changes that format, any client code dependent on it would "break" and would need to be adjusted to the new format, making it subject to break again. 
D)  All of the above are true.

Question 9

C# is case sensitive,so Name and name are distinct identifiers.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following statements is false

Accepted Answer

A)  In any class that does not explicitly declare a constructor, the compiler provides a public default constructor (which always has no parameters). 
B)  When a class has only the default constructor, the class's instance variables are initialized to their default values: 0 for numeric simple types, false for simple type bool and null for all other types. 
C)  If you declare one or more constructors for a class, the compiler will not create a default constructor for that class. 
D)  If the compiler does not create a default constructor for an Account class, you will not be able to create an Account object with the expression new Account().

Question 11

We could use a fully implemented Balance property to ensure that the set accessor's argument is valid before assigning it to the balance instance variable.

Accepted Answer

A) True 
 B)False

Question 12

Making a class's instance variables public and its methods private and accessing those instance variables only through the class's methods and properties facilitates debugging,because problems with data manipulations are localized to the methods (and properties).

Accepted Answer

A) True 
 B)False

Question 13

The Windows culture settings on the user's machine determine the format for displaying currency amounts,such as the commas vs.periods for separating thousands,millions,etc.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following statements is false

Accepted Answer

A)  If you later decide to include other logic in the get or set accessors, you can simply implement the property and an instance variable. 
B)  With an auto-implemented property, the C# compiler automatically creates a public instance variable, and the get and set accessors for getting and setting that instance variable. 
C)  With an auto-implemented property you can implement the property trivially, which is handy when you're first designing a class. 
D)  It's common to see property definitions where the get accessor simply returns private instance variable name's value and the set accessor simply assigns a value to the instance variable-no other logic appears in the accessors. For such simple cases, C# provides auto-implemented properties.

Question 15

Which of the following statements is false

Accepted Answer

A)  Normally, a class also contains methods and properties. These manipulate the instance variables belonging to particular objects of the class. 
B)  Instance variables are declared inside the bodies of the class's methods and properties. 
C)  Clients of a class cannot access the class's private instance variables. 
D)  Clients of a class can access the class's public methods.

Question 16

A method such as Main "drives" an object by calling its methods-without having to know how the class's internal mechanisms work.In this sense,the class containing method Main is referred to as a driver class.

Accepted Answer

A) True 
 B)False

Question 17

A property encapsulates a set accessor for storing a value into a variable and a get accessor for getting the value of a variable.

Accepted Answer

A) True 
 B)False

Question 18

Consider the code:
Console.WriteLine($"Initial name is: {myAccount.GetName()}");
Which method is called first

Accepted Answer

A)  WriteLine 
B)  GetName 
C)  They execute at the same time. 
D)  None of the above.

Question 19

An attempt by a method that's not a member of a particular class to access a private member of that class is a runtime error.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements is false

Accepted Answer

A)  Each object of a class shares one copy of the class's instance variables. 
B)  Each class declaration is typically stored in a file having the same name as the class and ending with the .cs filename extension 
C)  Class, property and method names begin with an initial uppercase letter (i.e., Pascal case); variable names begin with an initial lowercase letter (i.e., camel case). 
D)  A class has attributes, implemented as instance variables. Objects of the class carry these instance variables with them throughout their lifetimes.

Exam 4: Introduction to Classes,Objects,Methods and Strings

A method SetName might declare a parameter accountName to receive a new name to store in an Account object-a set accessor uses the implicitly declared keyword parameter for the same purpose.

Keyword get is a ________ keyword,because it's a keyword only in a property's body-elsewhere,get can be used as an identifier.

The property notation allows the client to directly manipulate the private instance variable.

Which of the following statements is false

Local variables are initialized to their default values.

Most instance variables are declared ________.

Consider the code: MyAccount.SetName(theName) ; Which of the following statements is false

Which of the following statements is false

C# is case sensitive,so Name and name are distinct identifiers.

Which of the following statements is false

We could use a fully implemented Balance property to ensure that the set accessor's argument is valid before assigning it to the balance instance variable.

Making a class's instance variables public and its methods private and accessing those instance variables only through the class's methods and properties facilitates debugging,because problems with data manipulations are localized to the methods (and properties).

The Windows culture settings on the user's machine determine the format for displaying currency amounts,such as the commas vs.periods for separating thousands,millions,etc.

Which of the following statements is false

Which of the following statements is false

A method such as Main "drives" an object by calling its methods-without having to know how the class's internal mechanisms work.In this sense,the class containing method Main is referred to as a driver class.

A property encapsulates a set accessor for storing a value into a variable and a get accessor for getting the value of a variable.

Consider the code: Console.WriteLine($"Initial name is: {myAccount.GetName() }") ; Which method is called first

An attempt by a method that's not a member of a particular class to access a private member of that class is a runtime error.

Which of the following statements is false