Podcast
Questions and Answers
Which of the following is the correct way to include the 'vector' header in C++?
Which of the following is the correct way to include the 'vector' header in C++?
- `#include <list>`
- `#include <vector>` (correct)
- `#include <iostream>`
- `#include <array>`
What is the primary advantage of using std::vector over traditional arrays in C++?
What is the primary advantage of using std::vector over traditional arrays in C++?
- Arrays have built-in methods that enhance efficiency.
- Vectors can dynamically resize, adapting to the number of elements stored. (correct)
- Vectors have a fixed size, ensuring memory efficiency.
- Arrays are part of the Standard Template Library.
Given a vector std::vector<int> numbers = {1, 2, 3, 4, 5};, how can you access the first element safely?
Given a vector std::vector<int> numbers = {1, 2, 3, 4, 5};, how can you access the first element safely?
- `numbers.at(1)`
- `numbers[0]`
- `numbers.element(0)`
- `numbers.front()` (correct)
What is the purpose of the push_back() method in std::vector?
What is the purpose of the push_back() method in std::vector?
If you have a std::vector<int> numbers; that is currently empty, what will numbers.size() return?
If you have a std::vector<int> numbers; that is currently empty, what will numbers.size() return?
What does the pop_back() function do to a std::vector?
What does the pop_back() function do to a std::vector?
How do you declare a 2D vector (a vector of vectors) of integers in C++?
How do you declare a 2D vector (a vector of vectors) of integers in C++?
What is the Standard Template Library (STL)?
What is the Standard Template Library (STL)?
Given std::vector<int> v = {10, 20, 30};, what happens when you try to access v[5]?
Given std::vector<int> v = {10, 20, 30};, what happens when you try to access v[5]?
Which method should be used for safer element access in a std::vector, providing bounds checking?
Which method should be used for safer element access in a std::vector, providing bounds checking?
What is the difference between the size() and capacity() methods of a std::vector?
What is the difference between the size() and capacity() methods of a std::vector?
What is the correct way to initialize a std::vector<int> named numbers with the values 1, 2, 3, 4, and 5?
What is the correct way to initialize a std::vector<int> named numbers with the values 1, 2, 3, 4, and 5?
What will be the output of the following code snippet?
std::vector<int> v2(5);
std::cout << v2.size() << std::endl;
What will be the output of the following code snippet?
std::vector<int> v2(5);
std::cout << v2.size() << std::endl;
Given a vector numbers, how would you use the sort function to sort it in ascending order?
Given a vector numbers, how would you use the sort function to sort it in ascending order?
What is the result of the following code?
std::vector<int> v;
v.push_back(42);
v.pop_back();
if (v.empty()) {
std::cout << "Vector is empty.";
}
What is the result of the following code?
std::vector<int> v;
v.push_back(42);
v.pop_back();
if (v.empty()) {
std::cout << "Vector is empty.";
}
In the context of vectors, what is the significance of iterators like v.begin() and v.end()?
In the context of vectors, what is the significance of iterators like v.begin() and v.end()?
Consider a std::vector<int> numbers = {1, 2, 3};. What happens when you execute numbers.insert(numbers.begin(), 10);?
Consider a std::vector<int> numbers = {1, 2, 3};. What happens when you execute numbers.insert(numbers.begin(), 10);?
Given std::vector<std::vector<int>> matrix(2, std::vector<int>(3, 0));, what does this line of code do?
Given std::vector<std::vector<int>> matrix(2, std::vector<int>(3, 0));, what does this line of code do?
When should you prefer using std::vector::at() over std::vector::operator[] for element access?
When should you prefer using std::vector::at() over std::vector::operator[] for element access?
Which of the following statements best describes how C++ vectors handle memory allocation?
Which of the following statements best describes how C++ vectors handle memory allocation?
Flashcards
What are Vectors in C++?
What are Vectors in C++?
Vectors are dynamic arrays, part of the Standard Template Library, that can grow and shrink dynamically, and have built-in methods for easier manipulation.
How to include the vector header?
How to include the vector header?
Before using vectors, include the vector header: #include <vector>
How to declare vectors?
How to declare vectors?
Vectors can be declared empty (vector<int> v1;), with a specified size and default values (vector<int> v2(5);), or initialized with specific values (vector<int> v3 = {1, 2, 3, 4, 5};).
How to access vector elements?
How to access vector elements?
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What are common vector operations?
What are common vector operations?
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How to declare a 2D vector?
How to declare a 2D vector?
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How to initialize 2D vectors?
How to initialize 2D vectors?
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Study Notes
- CMPS1232 is Principles of Programming II
- The class uses C++ to solve bigger problems
- The lecturer for the course is Dalwin D. Lewis
STL Vectors
- Vectors are N-Dimensional dynamic arrays that are part of the Standard Template Library.
- Vectors can grow and shrink dynamically, unlike arrays.
- Vectors have built-in methods for easier manipulation.
- Loops can be used to traverse and update N-Dimensional dynamic arrays.
- Functions can be used to perform operations on N-Dimensional dynamic arrays.
- To use vectors, the 'vector' header must be included:
#include <vector>
Declaring Vectors
vector<int> v1;declares an empty vector.vector<int> v2(5);declares a vector of size 5 with default values.vector<int> v3 = {1, 2, 3, 4, 5};declares and initializes a vector with specific values.
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