Deck 8: Advanced Method Concepts

Question 1

To ensure that the original value of an argument passed to a method remains unchanged after returning from the method, you should use a reference parameter or an output parameter.

Answer 1

False

Question 2

A method can return at most one value to a method that calls it.

Answer 2

True

Question 3

____ involves the ability to write multiple versions of a method using the same method name.

A) Overloading
B) Interfacing
C) Inheriting
D) Implementation hiding

Answer 3

A

Question 4

When you use a(n) ____ parameter in a method header, you indicate the parameter's type and name, and the method receives a copy of the value passed to it.

A) reference
B) output
C) input
D) value

Question 5

You use the keyword ____ as a modifier to indicate an output parameter.

A) ref
B) params
C) get
D) out

Question 6

Only one ____ keyword is permitted in a method declaration.

A) ref
B) params
C) out
D) string

Question 7

____ parameters act as aliases, or pseudonyms, for the same memory location occupied by the original variable being passed to a method.

A) Interface
B) Pointer
C) Reference
D) Value

Question 8

You cannot use the out or ref keywords when passing an array to a method.

Question 9

When you use a reference parameter, any passed variable must have an assigned value.

Question 10

A(n) ____ parameter to a method is one for which a value is automatically supplied if you do not explicitly send one as an argument.

A) actual
B) value
C) default
D) optional

Question 11

On occasion, you might want a method to be able to alter a value you pass to it. In that case, you can use a(n) ____ parameter or an output parameter.

A) value
B) reference
C) optional
D) global

Question 12

To avoid data conversion exceptions that occur when a value cannot be converted to an appropriate type, you can use a version of the C# ____ method with an out parameter.

A) Convert()
B) ReadLine()
C) TryParse()
D) Parse()

Question 13

In C#, parameters can be mandatory or ____.

A) optional
B) reference
C) output
D) value

Question 14

Overloaded methods sharing the same identifier must have the same return type.

Question 15

When you don't know how many arguments you might eventually send to a method, you can declare a(n) ____.

A) value parameter
B) parameter array
C) reference parameter
D) output parameter

Question 16

Methods are ____ when there is the potential for a situation in which the compiler cannot determine which method to use.

A) overloaded
B) ambiguous
C) polymorphic
D) hidden

Question 17

Using a(n) ____ parameter is convenient when the variable to be passed does not have an assigned value at the time the method is called.

A) reference
B) value
C) mandatory
D) output

Question 18

A method's name and parameter list constitute the method's ____.

A) return type
B) stamp
C) signature
D) type

Question 19

Methods with identical names that have identical parameter lists but different return types are ____ methods.

A) applicable
B) illegal
C) overloaded
D) related

Question 20

When you use a(n) ____ parameter, the argument used to call the method must have an assigned value.

A) output
B) optional
C) reference
D) formal

Question 21

What is the difference between a reference parameter and an output parameter?

Question 22

What is programming principle is violated when using named arguments and why is this important?

Question 23

If you assign a default value to any variable in a method's parameter list, then all parameters to the right of that parameter must have ____ values.

A) explicit
B) implicit
C) local
D) default

Question 24

Given the following code, describe a situation that would make the code ambiguous to the C# compiler:
using static System.Console;
public class AmbiguousMethods
{
static void Main()
{
int iNum = 20;
double dNum = 4.5;
SimpleMethod(iNum, dNum); // calls first version
SimpleMethod(dNum, iNum); // calls second version
SimpleMethod(iNum, iNum); // error! Call is ambiguous.
}
private static void SimpleMethod( int i, double d)
{
      WriteLine("Method receives int and double");
}
private static void SimpleMethod( double d, int i)
{
      WriteLine("Method receives double and int ");
}
}

Question 25

The rules that determine which method version to call are known as ____________________.

Question 26

What are the four types of mandatory parameters supported by C#?

Question 27

In C#, all data types are ____________________.

Question 28

What are two options for writing a called method that results in altering a single value in the calling method?

Question 29

Unnamed method arguments are also known as ____ arguments.

A) self-documenting
B) optional
C) default
D) positional

Question 30

Suppose that you create overloaded method versions with the following declarations:
private static void MyMethod( double d)
private static void MyMethod( float f)
Would MyMethod() run if it is called with an integer argument? Describe how C# determines which, if either, method should run when MyMethod() is called.

Question 31

When you use the Visual Studio ____________________ to create programs, the IntelliSense feature will allow you to discover built-in overloaded methods by displaying all versions of the method when you type in the method name and the parameter list opening parenthesis.

Question 32

Describe the similarities and differences among method versions when the method is overloaded.

Question 33

When a method call could execute multiple overloaded method versions, C# determines which method to execute using a process called ____________________.

Question 34

Given the following program, write the InputMethod() method. It should read two values from the user and assign them to the int variables first and second , which are then printed out in the code shown below.
using static System.Console;
class InputMethodDemo
{
static void Main()
{
int first, second;
InputMethod( out first, out second);
      WriteLine("After InputMethod first is {0}"), first);
      WriteLine("and second is {0}"), second);
}
}

Question 35

You name an argument in a method call using its parameter name and a ____ before the value.

A) comma
B) dot
C) colon
D) semicolon

Question 36

Only ____ parameters can be given default values.

A) value
B) reference
C) output
D) array

Question 37

Omitted ____ arguments are ignored for betterness purposes on argument conversions.

A) default
B) explicit
C) local
D) optional

Question 38

When an int is promoted to a double , the process is called an implicit ____________________ or implicit cast.

Question 39

Any optional parameters in a parameter list must appear to the right of all ____ parameters in the list.

A) local
B) mandatory
C) default
D) global

Question 40

Write the DisplayStrings() method called in the code below using a parameter array declared in the method header. The method should write its arguments in a single line, followed by a newline. What will the output be after running Main() ?
using static  System.Console;
class ParamsDemo
{
static void Main()
{
string[] names = {"Mark"), "Paulette"), "Carol"};
DisplayStrings("Ginger");
DisplayStrings("George"), "Maria"), "Thomas");
DisplayStrings(names);
}
}

Question 42

Given the following two method signatures, explain the reasoning behind how the C# compiler determines which method version to invoke for the call MyMethod(12) :
private static void MyMethod( int a)
private static void MyMethod( int a, char b = 'B')