static int circle ( int x1 , int y1 , int x2 , int y2 , int r1 , int r2 ) {
  int distSq = ( x1 - x2 ) * ( x1 - x2 ) + ( y1 - y2 ) * ( y1 - y2 ) ;
  int radSumSq = ( r1 + r2 ) * ( r1 + r2 ) ;
  if ( distSq == radSumSq ) return 1 ;
  else if ( distSq > radSumSq ) return - 1 ;
  else return 0 ;
}

static int circle ( int x1 , int y1 , int x2 , int y2 , int r1 , int r2 ) { int distSq = ( x1 - x2 ) * ( x1 - x2 ) + ( y1 - y2 ) * ( y1 - y2 ) ; int radSumSq = ( r1 + r2 ) * ( r1 + r2 ) ; if ( distSq == radSumSq ) return 1 ; else if ( distSq > radSumSq ) return - 1 ; else return 0 ; }
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