Check out example codes for "how to create a vector in c++". It will help you in understanding the concepts better.

Code Example 1

// CPP program to create an empty vector 
// and push values one by one. 
#include <vector>

using namespace std;
int main() 
    // Create an empty vector 
    vector<int> vect;  
    //add/push an integer to the end of the vector
	//to traverse and print the vector from start to finish
    for (int x : vect) 
        cout << x << " ";

    return 0; 

Code Example 2

// First include the vector library:
#include <vector>

// The syntax to create a vector looks like this:
std::vector<type> name;

// We can create & initialize "lol" vector with specific values:
std::vector<double> lol = {66.666, -420.69};

// it would look like this: 66.666 | -420.69

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