#include <iostream>
#include <cassert>
#include <vector>
using namespace std;

int main() 
{
  cout << "Demonstrating simplest vector constructors" 
       << endl;
  vector<char> vector1, vector2(3, 'x');
  assert (vector1.size() == 0);
  assert (vector2.size() == 3);
  assert (vector2[0] == 'x' && vector2[1] == 'x' &&
          vector2[2] == 'x');
  assert (vector2 == vector<char>(3, 'x') &&
          vector2 != vector<char>(4, 'x'));
  cout << " --- Ok." << endl;
  return 0;
}