static float calcAngle ( int hh , int mm ) {
  float hour_angle = 0.5f * ( hh * 60 + mm ) ;
  float minute_angle = 6 * mm ;
  float angle = Math . abs ( hour_angle - minute_angle ) ;
  angle = Math . min ( 360 - angle , angle ) ;
  return angle ;
}

static float calcAngle ( int hh , int mm ) { float hour_angle = 0.5f * ( hh * 60 + mm ) ; float minute_angle = 6 * mm ; float angle = Math . abs ( hour_angle - minute_angle ) ; angle = Math . min ( 360 - angle , angle ) ; return angle ; }
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