34933018
Descripción
Test por Dustin White, actualizado hace más de 1 año
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Creado por Dustin White
hace más de 2 años
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Pregunta 1
Pregunta
How do referenced types differ from primitive types?
Respuesta
-
Primitive types are integers.
-
Referenced types are strings.
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Primitive types use memory addresses.
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Referenced types use pointers to addresses.
Pregunta 2
Pregunta
Why do programmers use data structures rather than individual values?
Respuesta
-
for reduced storage
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for multiple data types
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for ease of access
Pregunta 3
Pregunta
Which data type only uses one bit per instance?
Respuesta
-
Short
-
char
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double
-
boolean
Pregunta 4
Pregunta
Which data type uses the most storage per value?
Respuesta
-
short
-
int
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long
-
float
Pregunta 5
Pregunta
What is the output of the following JavaScript code?
var Salutations = [["Dear", "Hello", "Howdy"], ["Friend", "Judy", "Concerned", "Good Old Pal"]]
console.log(Salutations[1][1])
Respuesta
-
Dear
-
Judy
-
Friend
-
Hello
Pregunta 6
Pregunta
How many elements are there in a two-dimensional array with length (4,7)?
Respuesta
-
21
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4
-
7
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28
Pregunta 7
Pregunta
What is the output of the following Swift code?
var noKeys = [5,4,7,8,10,22]
var noChains=noKeys.count
print(noChains)
Respuesta
-
4
-
7
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22
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6
Pregunta 8
Pregunta
Why is a linear search slow?
Respuesta
-
It uses conditional statements.
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It tests every element.
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It copies the array.
Pregunta 9
Pregunta
Why should you exercise restraint and care in the use of mutable arrays?
Respuesta
-
The syntax for their use is extremely tedious and sensitive.
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Their use can slow down performance dramatically.
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The code may become difficult to translate to other languages.
Pregunta 10
Pregunta
What is the output of the following C# code?
using System;
class Program
{
static void Main() {
int[ ][ ] jagged = new int[3][];
jagged[0]=new int[4];
jagged[1] = new int[2];
jagged[2]=new int[7];
Console.WriteLine(jagged[1][1]);
}}
Respuesta
-
3
-
2
-
0
-
7
Pregunta 11
Pregunta
What is the defining characteristic of a jagged, two-dimensional array?
Respuesta
-
The length in the second dimension is variable.
-
The elements consist of strings.
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The elements are of different data types.
-
The size of the array is not fixed.
Pregunta 12
Pregunta
What is the time complexity for a linear search if the value is not present?
Respuesta
-
O(ln(n))
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O(n)
-
O(1)
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O(n ln(n))
Pregunta 13
Pregunta
How are data elements referenced in an array?
Respuesta
-
by value
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with an index or key
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with a size or type
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by name
Pregunta 14
Pregunta
What is returned by MyList.contains("Buy glue") if you are using java.util.LinkedList?
Respuesta
-
a Boolean
-
a string
-
an integer
Pregunta 15
Pregunta
Where does the following Java code add a new element to a linked list?
Node nodeToAdd = new Node(data);
nodeToAdd.next = this.head;
this.head = nodeToAdd;
Respuesta
-
at the end of the list
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at the head of the list
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in the middle of the list
Pregunta 16
Pregunta
What is the time complexity for insertion into a linked list?
Respuesta
-
O(ln(n))
-
O(1)
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O(n)
Pregunta 17
Pregunta
How does Python implement linked lists?
Respuesta
-
as doubly linked lists
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as arrays
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as strings
Pregunta 18
Pregunta
What is required to change a singly linked list to a doubly linked list?
Respuesta
-
a two-dimensional array
-
pointers to adjacent nodes
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a second head node and reverse pointers
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a tail node and pointers to previous nodes
Pregunta 19
Pregunta
You have just added a new element at the end of an existing linked list. What is in the pointer of that new element?
Respuesta
-
the address of the first element in the list
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a null value
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the address of the last element in the list
Pregunta 20
Pregunta
What is contained in a node of a linked list?
Respuesta
-
a value and an index
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a string and an integer
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data and a pointer
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an array and a size
Pregunta 21
Pregunta
How do queues differ from stacks?
Respuesta
-
Queues use FIFO and stacks use LIFO.
-
Queues use LIFO and stacks use FIFO.
-
Queues add and remove from the end of the list rather than from the beginning.
-
Stacks add and remove from different ends of the list rather than from the same end.
Pregunta 22
Pregunta
What is wrong with the following Java code?
import java.util.Stack;
public class MyClass {
public static void main(String args[]) {
Stack myStack = new Stack();
myStack.push("test");
myStack.pop();
myStack.pop();
Respuesta
-
There is a missing ;.
-
It attempts to push to an empty stack.
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There is an extra {.
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It attempts to pop from an empty stack.
Pregunta 23
Pregunta
The following Swift code uses the push and pop functions as in the example. What is the value of SecondPop?
var deck:Stack=Stack()
deck.push(item: "Queen: Spades")
deck.push(item "10: Diamonds")
deck.push(item: "4: Hearts")
deck.push(item: "2: Hearts")
var FirstPop = deck.pop()
var SecondPop= deck.pop()
Respuesta
-
10: Diamonds
-
Queen: Spades
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4: Hearts
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2: Hearts
Pregunta 24
Pregunta
In the Swift code func pop()-> String?, what does the question mark mean?
Respuesta
-
The function may sometimes fail.
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The length of the string is unknown.
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The value returned is either a string or nil.
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The argument of the function is unknown.
Pregunta 25
Pregunta
Which data structure is most useful for reversing an ordered state or list?
Respuesta
-
a queue
-
a stack
-
a string
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an array
Pregunta 26
Pregunta
What does LIFO stand for?
Respuesta
-
least important for order
-
limit in free order
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least in first on
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last in first out
Pregunta 27
Pregunta
How are items with the same priority dequeued from priority queues?
Respuesta
-
by FIFO
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by LIFO
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by value
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by size
Pregunta 28
Pregunta
The following Swift code uses the Queue class as in the example. What does the print() function output?
var yourQueue = Queue()
yourQueue.enqueue(item: "10")
yourQueue.enqueue(item: "5")
yourQueue.enqueue(item: "8")
var OutZero yourQueue.dequeue()
var OutOne = yourQueue.dequeue()
print(yourQueue.peek()!)
Respuesta
-
10
-
8
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nil
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5
Pregunta 29
Pregunta
What does a peek() return from a queue?
Respuesta
-
the first item
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an arbitrary item
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the last item
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the middle item
Pregunta 30
Pregunta
Which language has the least support for hash functions and tables?
Respuesta
-
Python
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Swift
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Javascript
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Java
Pregunta 31
Pregunta
Which line in the following Python 3 code produces a Key Error?
Respuesta
-
CapitalsToStates["Austin"] = "Texas"
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print(CapitalsToStates["New York"])
-
CapitalsToStates = {}
-
print(CapitalsToStates["Austin"])
Pregunta 32
Pregunta
Why would you use separate chaining?
Respuesta
-
to increase access speed
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to resolve a collision
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to calculate a remainder
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to generate a small index
Pregunta 33
Pregunta
When do hash tables suffer in performance?
Respuesta
-
when the keys are excessively long
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when there are collisions
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when the table is very large
Pregunta 34
Pregunta
How does hashing differ from encrypting?
Respuesta
-
Encrypting is reversible, but hashing is not.
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Encrypting produces plain text, but hashing produces integers.
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Hashing uses ASCII, and encrypting does not.
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Hashing produces unique values, but encrypting does not.
Pregunta 35
Pregunta
Which statement is true for associative arrays?
Respuesta
-
Values must be ordered.
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Keys must be unique.
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Values must be unique.
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Keys must be ordered.
Pregunta 36
Pregunta
Which statement is true for a tree data structure?
Respuesta
-
A parent can have only two children.
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Leaves can have many children.
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The root does not have a parent.
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A node cannot be both a parent and a child.
Pregunta 37
Pregunta
What does the following Python 3 code output?
pocketContents=set(["keys","coins","knife"])
pocketContents.add("receipt")
pocketContents.add("string")
print(pocketContents)
Respuesta
-
{'receipt', 'coins', 'keys', 'string'}
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{'receipt', 'coins', 'keys', 'string', 'knife'}
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{'string', 'knife'}
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{'receipt', 'coins', 'keys', 'knife'}
Pregunta 38
Pregunta
Which list constitutes a valid set containing four elements?
Respuesta
-
{0, 5, 12, 0}
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{"four", "twelve", 6, "four"}
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{"dog", "cat", "dog", "car"}
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{0, "dog", "car", 7}
Pregunta 39
Pregunta
What characterizes a min heap?
Respuesta
-
The children have values less than those of their parents.
-
The value of the right child is less than that of the left.
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The root contains the largest value.
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The root contains the lowest value.
Pregunta 40
Pregunta
Why are binary search trees organized with the left child less than the parent and the right child greater than the parent?
Respuesta
-
to have more layers or branches
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to reduce storage requirements
-
to use fewer pointers
-
to make them easy to search
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