c++ length of vector code example

Example 1: how to create a vector in c++

// 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

Example 2: c++ vector size

#include <vector>

int main() {
  std::vector<int> myVector = { 666, 1337, 420 };
  
  size_t size = myVector.size(); // 3
  
  myVector.push_back(399); // Add 399 to the end of the vector
  
  size = myVector.size(); // 4
}

Example 3: vector length c++

#include <vector>

int main () {
    std::vector<int> v;
    auto size = v.size();
}

Example 4: finding the size of vector in c++

vector<int> a;
//to directly find the size of the vector;
//use  a.size(;

cout <<" " << a.size();