# include <cstdlib>
# include <iostream>
# include <cmath>

using namespace std;

int main ( )
{
  int i;
  unsigned int seed;

  cout << "\n";
  cout << "1: No call to srand( ).\n";
  cout << "Here are the first five default random values:\n";
  cout << "\n";
  for ( i = 1; i <= 5; i++ )
  {
    cout << "  " << i << "  " << rand ( ) << "\n";
  }
  cout << "\n";
  cout << "2: Let seed be 123, call srand ( seed ).\n";
  cout << "\n";
  seed = 123;
  srand ( seed );
  for ( i = 1; i <= 5; i++ )
  {
    cout << "  " << i << "  " << rand ( ) << "\n";
  }

  seed = time ( 0 );
  srand ( seed );
  cout << "\n";
  cout << "3: Let seed be time(0) = " << seed << ", call srand ( seed ).\n";
  cout << "\n";
  for ( i = 1; i <= 5; i++ )
  {
    cout << "  " << i << "  " << rand ( ) << "\n";
  }
  cout << "\n";
  cout << "4: Let seed be 1999, call srand ( seed ).\n";
  cout << "\n";
  seed = 1999;
  srand ( seed );
  for ( i = 1; i <= 5; i++ )
  {
    cout << "  " << i << "  " << rand ( ) << "\n";
  }
  cout << "\n";
  cout << "5: Let seed be 123, call srand ( seed ).\n";
  cout << "\n";
  seed = 123;
  srand ( seed );
  for ( i = 1; i <= 5; i++ )
  {
    cout << "  " << i << "  " << rand ( ) << "\n";
  }
  cout << "\n";
  cout << "6: Let seed be 123, call srand ( seed )\n";
  cout << "   but do this before EVERY call.\n";
  cout << "\n";
  seed = 123;
  for ( i = 1; i <= 5; i++ )
  {
    srand ( seed );
    cout << "  " << i << "  " << rand ( ) << "\n";
  }
  seed = time ( 0 );
  srand ( seed );
  cout << "\n";
  cout << "7: Let seed be time(0) = " << seed << ", call srand ( seed ).\n";
  cout << "\n";
  for ( i = 1; i <= 5; i++ )
  {
    cout << "  " << i << "  " << rand ( ) << "\n";
  }
  return 0;
}