To create a vector in C++, you need to include the <vector> library.

#include <vector>

Once the library is included, you can declare a vector by specifying its type.

std::vector<int> myVector; // Creates an empty vector of integers

This creates an empty vector of integers named myVector. You can also initialize the vector with initial values using initialization lists.

std::vector<int> myInitializedVector = {1, 2, 3, 4, 5}; // Initializes a vector with values

To add elements to the vector, you can use the push_back() method.

myVector.push_back(10); // Adds the element 10 to the end of the vector

You can access elements of the vector using the subscript operator [].

int firstElement = myVector[0]; // Retrieves the value at index 0

The size() function returns the current size of the vector.

int vectorSize = myVector.size(); // Returns the number of elements in the vector

To iterate over the vector and perform operations on each element, you can use a for loop.

for (int i = 0; i < myVector.size(); i++) {
    std::cout << myVector[i] << " "; // Prints each element followed by a space
}

Remember to include the <iostream> library to use the std::cout object for printing.

Vectors in C++ are versatile and provide many other useful functions like pop_back(), insert(), erase(), and more. It is a powerful tool for dynamically managing collections of elements.

So, if you need to work with a dynamically resizable array in C++, a vector is a great choice to simplify your coding process and make your program more flexible and efficient.

#cplusplus #vector