How do I perform operations on vectors in C++?

How do I perform operations on vectors in C++?

In C++, you can use the std::vector class from the Standard Library to perform various operations. What specific operation are you interested in?

Can you show me how to add elements to a vector?

Sure! You can add elements to a vector using the push_back() method. For example:

std::vector<int> vec;
vec.push_back(10);
vec.push_back(20);

How can I access elements in the vector?

You can access elements in a vector using the subscript operator [] or the at() method. For example:

int firstElement = vec[0]; // using subscript
int secondElement = vec.at(1); // using at()

What about removing elements?

To remove elements, you can use the pop_back() method to remove the last element or the erase() method to remove a specific element. For example:

vec.pop_back(); // removes the last element
vec.erase(vec.begin() + 1); // removes the second element