int main ( void )
{
  int    i = 0, j = 0;
  double x = 0.0;

  //..

  if ( 0 == i )
  {
    x = 1.0;
  }
  else if ( 1 == i )
  {
    x = 2.0;
  }
  else                //遵循1
  {
    x = 0.0;
  }

  if ( 0 == j )
  {
    x = x + 5.0;
  }

  return ( 0 );
}