segfault.cpp

#include <iostream>

using namespace std;

int main()
{  
  int v;
  int *ptr = &v;
  
  *ptr = 15;
  ptr++;
  ptr++;
  *ptr = 10;
  
  cout << "V is " << v << endl;
  cout << "ptr " << ptr << endl;
  cout << " is " << *ptr << endl;

  return 0;
}

Q1) right
Q2) should is not the correct term, what you have here is an undefined behaviour, nothing is specified on what should happen in this case.

Thank you both :)