Mine

#include <iostream>

using namespace std;

class Vector {
  public:
   Vector(int);
   void set();
   void sum();
   void dif();
   void mult();
   void div();
   void printel();
   void print();
  private:
   int const size;
   int vec[size];
 };

Vector::Vector(int sz): size(sz) {}
int main()
{
 Vector a(5);

}