Deck 7: Methods: a Deeper Look

Question 1

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.

Answer 1

B

Question 2

A method is invoked by a.

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

Answer 2

C

Question 3

Which of the following correctly calls the Math class method Sqrt with a value of 36

A) Sqrt(36);
B) Math.Sqrt(36);
C) Math.Sqrt = 36;
D) None of the above.

Answer 3

B

Question 4

When may an app omit the string[] args parameter from the Main header

A) when the app does not need to use strings
B) when the app does not take command-line arguments
D) All of the above

Question 5

Programmers write to define specific tasks that may be used at many points in a program.

A) classes
B) methods
C) modules
D) None of the above.

Question 6

Methods should be large and perform as many tasks as possible.

Question 7

A static variable represents class-wide information.

Question 8

Information may be methods.

A) passed to
B) returned from
C) manipulated in
D) All of the above.

Question 9

Prepackaged methods and classes are available for use in theNET Framework Class Library.

Question 10

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

Question 11

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

Question 12

Methods can return at most one value.

Question 13

Methods defined by the programmer may consist only of predefinedNET method calls.

Question 14

Which of the following describes a static variable

A) a variable with one copy shared by all class objects
B) a variable whose value may not be changed
C) all of the above
D) None of the above.

Question 15

A return type of is specified for a method that does not return a value.

A) nothing
B) null
C) void
D) None of the above.

Question 16

Methods that call themselves are known as ________ methods.

A) reiterative
B) self-calling
C) repeat-calling
D) recursive

Question 17

Which of the following can be arguments to methods

A) constants
B) variables
C) expressions
D) All of the above

Question 18

The technique of dividing large programs into simple problems is known as divide and conquer.

Question 19

Any variable declared with keyword const is a constant and cannot be changed after it's declared and initialized.

Question 20

_________ methods can be called without the need for an object of the class to exist.

A)special
B)independent
C)static
D)dependent

Question 21

A program contains a copy of a static variable for each object that's instantiated.

Question 22

Let x be a double.How can you typecast a double into a float

A) implicitly
B) x(float)
C) (float)x
D) x = float

Question 23

Which statement is false

A) If a method does not return a value, the return-value-type in the method declaration can be omitted.
B) Placing a semicolon after the right parenthesis enclosing the parameter list of a method declaration is a syntax error.
C) Re-declaring a method parameter as a local variable in the method's body is a compilation error.
D) Forgetting to return a value from a method that should return a value is a compilation error.

Question 24

The Math class provides only methods.

Question 25

Which keyword can you use to immediately give control back to a method's caller

A) continue
B) break
C) return
D) next

Question 26

To call a static method,use the _________ name followed by a period,and the method with its arguments.

A) class's
D) All of the above

Question 27

The parameter list in the method header and the arguments in the method call must agree in:

A) number
B) type
C) order
D) all of the above

Question 28

A(n)conversion occurs when a type is converted to a type that can hold more data.

A) implicit
B) widening
C) explicit
D) None of the above.

Question 29

To access the class's non-static members,a static method must use a reference to an object of the class.

Question 30

When a return statement executes,control proceeds immediately to the first statement after the method that issues the return.

Question 31

How are various parameters separated in the method header

A)brackets
B)braces
C)commas
D)periods

Question 32

An int must be explicitly cast to which of the following

A) float
B) double
C) sbyte
D) None of the above.

Question 33

When an object is concatenated with a string:

A) a compilation error occurs
B) a runtime error occurs
C) the object's ToString method is implicitly called
D) the object's class name is used

Question 34

Converting a simple type to another simple type may change the value.

Question 35

Method arguments may not be expressions.

Question 36

strings can be concatenated only with the method Concat.

Question 37

Conversions that cause data loss are not allowed in C#.

Question 38

Main is declared static so the execution environment can invoke Main without creating an instance of the class.

Question 39

Methods are called by writing the name of the method followed by a left brace followed by the argument (or a comma-separated list of arguments)of the method followed by a right brace.

Question 40

A static method can ________.

A) call only other static methods of the same class directly
B) manipulate only static fields in the same class directly
C) be called using the class name and a dot (.)
D) All of the above

Question 41

It's always better to write your own code than to search and use a class from the FCL.

Question 42

To compare a simple-type value to the underlying value of an enumeration constant,you must use a cast operator to make the two types match.

Question 43

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

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

Question 44

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 the programmer 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 45

Which directive allows you to use the Framework Class Library

A)import
B)using
C)load
D) namespace

Question 46

Any variables declared in a for statement header have block scope within that statement.

Question 47

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 48

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

Question 49

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

Question 50

What does the Framework Class Library hold

A)namespaces
B) classes

Question 51

Which of the following cannot be an enum's underlying type

A)sbyte
B)int
C)ulong
D)double

Question 52

If a local variable in a method has the same name as a field of the method's class,what will occur

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

Question 53

Which of the following statements describes block scope

A) It begins at the opening { of the class declaration and terminates at the closing }
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 right brace (}).
D) It is valid for one statement only.

Question 54

By including using System;at the top of a source program,you can use the unqualified class name,Console,instead of the fully qualified class name,System.Console.

Question 55

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

Question 56

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 57

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

Question 58

Identifiers declared within a class have

A) block scope
B) class scope
C) local scope
D) None of the above.

Question 59

A particular seed value passed to the Random class's constructor causes the Random object to always produce the same series of random numbers.

Question 60

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

Question 61

Overloaded methods always have the same _________.

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

Question 62

Any parameter in a parameter list can be declared as an optional parameter.

Question 63

The order of a method's parameters is insignificant.

Question 64

Consider the following Cube method:
Static int Cube(int x)
{
Return x * x * x;
}
Which of the following statements is false

A) In C# 6, this method can be defined with an expression-bodied method as
Static int Cube(int x) = > x * x * x;
The value of x * x * x is returned to Cube's caller implicitly.
B) The symbol = > follows the method's parameter list and introduces the method's body-no braces or return statement are required. This can be used only with static methods.
C) If the expression to the right of = > does not have a value (e.g., a call to a method that returns void), the expression-bodied method must return void.
D) Similarly, a read-only property can be implemented as an expression-bodied property. The following re-implements the IsNoFaultState property we used in the textbook to return the result of a logical expression:
Public bool IsNoFaultState = >
State == "MA" || State == "NJ" || State == "NY" || State == "PA";

Question 65

The local variables used in each invocation of a method during an app's execution are stored in the ________.

A)program execution stack
B)activation record
C)stack frame
D)All of the above.

Question 66

Which of the following is not part of recursion

A) recursive call
B) recursion step(s)
C) base case(s)
D) None of the above.

Question 67

When calling a method,you must specify the arguments in the same order that the corresponding parameters are declared in the method's parameter list.

Question 68

Since memory in a computer is finite,a stack error may occur known as stack overflow.

Question 69

Methods of a class can access all members defined in that class.

Question 70

C# 6 introduces a new concise syntax for ________:

A) methods that contain only a return statement that returns a value
B) read-only properties in which the get accessor contains only a return statement
C) methods that contain single statement bodies.
D) All of the above

Question 71

Methods of the same name can be declared in the same class,as long as they have different sets of parameters (determined by the number,types and order of the parameters).

Question 72

A recursion step normally includes the keyword return.

Question 73

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

Question 74

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 75

Stacks are _____________ data structures.

A) FIFO
B) Random
C) LIFO
D) None of the above.

Question 76

Optional parameters enable you to specify default argument values for specific parameters.

Question 77

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, but a different return type than another method.

Question 78

A local variable or reference declared in a block can be used in blocks in which that block is nested.

Question 79

A recursive method is a method that:

A) calls another method
B) calls itself
C) has no return type
D) None of the above

Question 80

A recursive method knows directly how to solve only the base case.