unsigned int sum ( unsigned int p1, unsigned short p2 );

int main ( void )
{
  unsigned int ix, iy, iz;

  ix = 1;
  iy = 2;
  iz = sum ( ix, ( unsigned short ) iy );  //遵循1

  return ( 0 );
}

unsigned int sum ( unsigned int p1, unsigned short p2 )
{
  unsigned int ret;

  ret = ( unsigned int ) ( p1 + p2 );
  
  return ret;
}