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#include <iostream>
#include <vector>

//function that returns a vector
std::vector<int> demofunction(){
  return {2,3,5,7,11};
}

int main(){
  //declares vector-variable
  std::vector<int> demoVector;
  
  //initializes vector
  demoVector = {1,2,3,5,7,11,13};
  
  /* "std::cout << demoVector" is not possible!
  You must adress a certain element*/
  std::cout << demoVector[0];
  
  //adds an element to an Vector
  demoVector.push_back(12);
  
  //removes an element at the end of an Vector
  demoVector.pop_back();
  
  //returns the size/lenght
  demoVector.size();
}