static float power ( float x , int y ) {
  float temp ;
  if ( y == 0 ) return 1 ;
  temp = power ( x , y / 2 ) ;
  if ( y % 2 == 0 ) return temp * temp ;
  else {
    if ( y > 0 ) return x * temp * temp ;
    else return ( temp * temp ) / x ;
  }
}

static float power ( float x , int y ) { float temp ; if ( y == 0 ) return 1 ; temp = power ( x , y / 2 ) ; if ( y % 2 == 0 ) return temp * temp ; else { if ( y > 0 ) return x * temp * temp ; else return ( temp * temp ) / x ; } }
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