Deck 6: Methods

Question 1

Which of the following is not a way of packaging code?

A)methods
B)classes
C)variables
D)class libraries

Answer 1

C

Question 2

Methods can return at most one value.

Answer 2

True

Question 3

A function can return multiple values.

Answer 3

False

Question 4

Two types of methods exist: subroutines and functions.

Question 5

A method must always return a result to the method's caller.

Question 6

Many classes and methods for performing common operations such as mathematical calculations and string manipulations are already provided by .NET's Framework Class Library.

Question 7

The header for a function must define the return type of the value to be returned.

Question 8

Methods are called by writing the name of the method followed by enclosed in parentheses.

A)a condition
B)arguments
C)a counter
D)None of the above.

Question 9

A method is invoked by a .

A)return statement
B)method header
C)method call
D)None of the above.

Question 10

Repeating high-quality,high-performance code in a program helps ensure higher quality programs.

Question 11

Which of the following is not part of the method header?

A)method body
B)method name
C)parameter list
D)None of the above

Question 12

What do functions have that subroutines do not?

A)Exit Sub keywords
B)a return value
C)ByVal keyword
D)None of the above

Question 13

Subroutines are _______.

A)methods that can be called only once
B)methods that cannot be called with arguments
C)methods that do not return a value
D)methods that return an optional value

Question 14

It's best to have each method complete as many tasks as possible.

Question 15

The return type of a method's return value is specified in the method call.

Question 16

Information may be methods.

A)provided for
B)returned from
C)manipulated in
D)All of the above.

Question 17

Which of the following is not a motivation for dividing code into methods?

A)makes program development more manageable
B)software reusability
C)have more separate files
D)avoid repeating code

Question 18

Method arguments can be constants,variables or more involved expressions.

Question 19

It's possible for _________ methods to be called without the need for an object of the class to exist.

A)Special
B)Independent
C)Shared
D)Dependent

Question 20

The Return statement must occur at the end of a method for it to operate correctly.

Question 21

When Option Explicit is set to Off,the compiler will interpret misspelled variable names as new variables.

Question 22

Type-conversion functions are used to perform explicit conversions between data types.

Question 23

The methods in the Convert class can be used for explicit and narrowing conversions.

Question 24

Keyword Val is used to pass an argument by value.

Question 25

A __________ conversion occurs when there is potential for data loss during the conversion.

A)widening
B)implicit
C)narrowing
D)explicit

Question 26

Passing an argument to a method by value provides the method with:

A)the address of the value in memory
B)a separate copy of the value
C)the type of the value
D)None of the above.

Question 27

Which of the following statements describes block scope?

A)It begins at the beginning of the class declaration and terminates at the closing End Class.
B)It limits label scope to only the method in which it is declared.
C)It begins at the identifier's declaration and ends at the terminating End clause.
D)It is valid for one statement only.

Question 28

__________ argument conversion converts an argument's value to the type that a method expects to receive in its corresponding parameter.

A)Widening
B)Implicit
C)Narrowing
D)Explicit

Question 29

__________ forces you to declare all variables before they're used in a program.

A)Option Explicit
B)Option Strict
C)Option Convert
D)None of the above.

Question 30

Which of these statements best defines scope?

A)Scope refers to the classes that have access to a variable.
B)Scope determines whether a variable's value can be altered.
C)Scoping allows you to use a class without using its fully qualified name.
D)Scope is the portion of a program that can refer to an entity by its simple name.

Question 31

If a local variable in a method has the same name as a variable in the main program,what will occur?

A)an error is generated
B)the variable in the main program is "hidden" until the method is finished executing
C)the variable in the main program will override the variable from the method
D)None of the above.

Question 32

Option Strict is meant to reduce the chance of errors by disabling narrowing conversions.

Question 33

Passing arguments by reference can weaken security because the called method can modify the caller's data.

Question 34

__________ causes the compiler to check all conversions and requires you to perform all narrowing conversions explicitly.

A)Option Explicit
B)Option Strict
C)Option Convert
D)None of the above

Question 35

Which statement is false?

A)To ensure that the operands are of the same type,Visual Basic performs implicit conversion on selected operands.
B)Cast operators are unary operators.
C)Cast operations are performed implicitly when Option Strict is off.
D)Cast operators are formed by placing parentheses around the name of a type.

Question 36

The keyword is used to pass value-type variables to methods by reference.

A)ByRef
B)Reference
C)RefPass
D)Ref

Question 37

Any variables declared in a For…Next statement header have block scope within that statement.

Question 38

Identifiers declared within a class have .

A)block scope
B)class scope
C)local scope
D)module scope

Question 39

A __________ conversion occurs when an argument is converted to a parameter of another type that can hold more data.

A)widening
B)implicit
C)narrowing
D)explicit

Question 40

A method's changes to a variable that is passed by value do not affect the value of the original variable.

Question 41

Cast operations are formed by enclosing a type name in braces.

Question 42

The expression value = 2 + randomObject.Next(8)will result in a random number in what range?

A)0 through 8
B)2 through 9
C)2 through 10
D)2 through 8

Question 43

Values produced by random-number generating methods are truly random.There is no way to predict the next result.

Question 44

If values generated by a random number generator are truly random,the
frequencies of each of the values will be approximately the same.

Question 45

A is provided to a random number generator to ensure the same sequence of numbers is not generated during each execution.

A)date value
B)parameter
C)seed value
D)None of the above.

Question 46

A(n)___________is a value type that contains a set of constant values.

A)enumeration
B)object
C)set
D)None of the above.

Question 47

If a change is made to an enumeration,you must change the program in every place that the old value was used.

Question 48

Variables declared in a method exist while the method is active and are destroyed when the method is exited.

Question 49

When a single argument is passed to Next,that argument is the:

A)collection factor
B)range factor
C)random factor
D)scaling factor

Question 50

Values returned by the Random class method Next are pseudo-random numbers.

Question 51

A variable declared in a class cannot have the same name as a variable declared in another class.

Question 52

A GroupBox is used to group related code.

Question 53

The values produced by Random are weighted so that some values will be generated with greater frequency than others.

Question 54

The Next method produces a random number from zero up to and including the number it is provided by the programmer.

Question 55

Which of the following cannot be an Enum's underlying type?

A)SByte
B)Integer
C)ULong
D)Double

Question 56

A button will become unavailable only if an error is detected in the event handler for that button.

Question 57

Random-number generator scaling is the process of:

A)causing each number in a range to have equal likelihood of being generated
B)modifying the range from which a number will be generated
C)calculating a sequence of numbers to be generated
D)None of the above.

Question 58

A particular seed value always produces the same series of random numbers.

Question 59

A GroupBox's Text property displays in the upper-left corner of the GroupBox.

Question 60

A reference-type variable can be specified as not being associated with an object by using the keyword Nothing.

Question 61

Which of the following method headers are appropriate for the method call SR(True,0,2.6)?

A)Sub SR( ByVal a As Boolean,ByRef b As Double,_ ByRef c As Integer )
B)Sub SR( ByVal a As Boolean,ByVal b As Double,_ ByVal c As Double )
C)Sub SR(ByRef a As Boolean,ByRef b As Integer,_ By Ref c As Double )
D)b and c

Question 62

Which of the following will violate the rules of overloading methods?

A)Methods with the same signatures but different return types.
B)Methods with different signatures but the same return type.
C)Methods with different number of arguments.
D)Method with different types of arguments.

Question 63

Optional arguments can be placed in any particular order with non-Optional arguments in a method header.

Question 64

Declaring a non-Optional parameter to the right of an Optional parameter is allowed.

Question 65

The Step Into debugger command can be used to __________.

A)return from the method to the caller
B)modify the code at execution time to correct a logic error
C)execute the code statements in a different order to locate a bug
D)view the code for a called method as it executes

Question 66

Which of the following method calls would not be valid with the following method header?

A)Example()
B)Example(True)
C)Example(False,10)
D)None of the above

Question 67

If you wish to execute several statements without repeatedly clicking the Step Over debugger command,you can right click the statement where you'd like to continue step-by-step execution,then select Run to Cursor from the menu that appears.The debugger will execute the statements up to,and including,that statement.

Question 68

Which of the following statements is false?

A)To have an optional parameter,place the Optional keyword at the beginning of an argument in the method header.
B)The optional parameter must provide a default value.
C)The optional argument(s)can be placed anywhere in the parameter list of the method header.
D)When calling a method,the optional argument can be omitted.

Question 69

Overloaded methods always have the same _________.

A)method name
B)return type
C)number of the parameters
D)order of the parameters

Question 70

An overloaded method is one that

A)has a different name than another method,but the same parameters.
B)has the same name as another method,but different parameters.
C)has the same name and parameters as a method defined in another class.
D)has the same name and parameters as another method,but a different return type.

Question 71

Overloaded methods normally perform similar tasks,but on different types of data.

Question 72

The Step Out debugger command can be used to __________.

A)return from the method to the caller
B)modify the code at execution time to correct a logic error
C)execute the code statements in a different order to locate a bug
D)view the code for a called method as it executes

Question 73

When an app is running in the debugger,the Start Debugging command becomes the Continue command.If you click Continue while in break mode,the debugger will execute statements until it reaches the next breakpoint.If there aren't any,the program will simply execute until it completes or until the event handler that you're debugging finishes executing.

Question 74

Every argument specified in a method header must be provided in a method call.

Question 75

If the next statement to execute is not a method call,then the Step Into debugger command has the same effect as the Step Over command.

Question 76

You must provide a default value for any arguments that are declared Optional.