vector size

The size of a vector in C++ can be determined using the size() function. Here are the steps to get the size of a vector:

1. Declare a vector variable: Start by declaring a vector variable. For example, you can declare a vector of integers like this:

std::vector<int> myVector;

1. Populate the vector: Add elements to the vector using the push_back() function. For example, add three integers to the vector:

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

1. Get the size of the vector: To obtain the size of the vector, call the size() function on the vector variable. This function returns an integer representing the number of elements in the vector. For example:

int vectorSize = myVector.size();

1. Use the vector size: You can now use the vectorSize variable to perform operations based on the size of the vector. For example, you can iterate over the vector using a loop:

for (int i = 0; i < vectorSize; i++) {
    std::cout << myVector[i] << " ";
}

That's how you can determine the size of a vector in C++ using the size() function.