Even Odd - C++

#include <iostream>
using namespace std;

void PrintArray(int a[], int n)
{
  for(int i = 0; i < n; ++i)
    cout << a[i] << " ";
}

int main() 
{
  int n, p1 = 0, p2 = 0;
  cin >> n;
  
  int a[n];
  for(int i = 0; i < n; ++i)
    cin >> a[i];
  
  while(p2 < n)
  {
    if(a[p2] % 2 == 0)
    {
      swap(a[p1], a[p2]);
      ++p1;
    }
    ++p2;
  }
  
  PrintArray(a, n);
  
  return 0;
}