# include <cstdlib>
# include <iostream>
void perm_next ( int n, int p[], int &rank );

using namespace std;

int main ( )
//
//  PERM_TEST demonstrates the use of PERM_NEXT to generate permutations.
//
{
  int i, n = 4, p[4], rank;

  rank = -1;
  while ( true )
  {
    perm_next ( n, p, rank );

    if ( rank == -1 ) 
    {
      break;
    }

    cout << "  " << rank << ":  ";
    for ( i = 0; i < n; i++ )
    {
      cout << "  " << p[i];
    }
    cout << "\n";
  }

  return 0;
}