how to get the size of a vector in c++

To get the size of a vector in C++, you can use the size() function. Here are the steps to do it:

1. Declare a vector variable: Start by declaring a vector variable of the desired type. For example, to create a vector of integers, you can use the following syntax:

std::vector<int> myVector;

1. Populate the vector: Add elements to the vector using the push_back() function or any other method you prefer. For example, to add three elements to the vector, you can use the following code:

myVector.push_back(10);
myVector.push_back(20);
myVector.push_back(30);

1. Get the size: To obtain the size of the vector, you can call the size() function on the vector variable. Here's an example:

int vectorSize = myVector.size();

The size() function returns the number of elements currently stored in the vector. In this case, vectorSize will be equal to 3.

That's it! By following these steps, you can get the size of a vector in C++.