How to use SWF height for class variable in actionscript3?

Question

I want to use height in [SWF height=200] for class variable.

I tried the following code but it causes compile error.

const SWF_HEIGHT:int = 200;

package {
    import flash.display.*;

    [SWF(backgroundColor=0xffffff, width=400, height=SWF_HEIGHT)]

    public class Main extends Sprite {
        public static const Y:int = SWF_HEIGHT / 2;
    }
}

If I use the number, 200 instead of const SWF_HEIGHT, the compile error doesn't happen.
But I don't want to write the same number on 2 places.

Is there way to avoid writing the same number on 2 places?

Answer 1

-- ANSWER HAS BEEN EDITED --

You need to do it the other way around:

package {
    import flash.display.*;

    [SWF(backgroundColor=0xffffff, width=400, height=200)]

    public class Main extends Sprite {
        private static var _swfHeight : int = -1;
        public static function get swfHeight():int{
            return _swfHeight;
        }
        public function Main():void{
            _loader = this.loaderInfo;
            _loader.addEventListener(Event.COMPLETE, loaded );
        }
        private var _loader : LoaderInfo;
        private function loaded( event : Event ) : void{
            _swfHeight = _loader.height;
        }
    }
}