How to convert this code from ActionScript 2.0 to ActionScript 3.0?

Question

I make a kind of simple game for assessing students, I can build the code based ActionScript 2.0. I hear from a fried that ActionScript 3.0 can be used on Android. So I hope my game can play in Android, this is my ActionScript 2.0 code

stop();
score=0;//skor total
step=1;//gerakan pemain
moveframe=4;
number=0;//dadu

a1.onPress=function(){
    number=0;
    number=number+1;
    score=score+1;
    step=step+1;
    moveframe=moveframe+1;
    _root.player._x = _root["square"+step]._x;
    _root.player._y = _root["square"+step]._y;
    _root.gotoAndStop(moveframe);
    _root.soal.gotoAndStop(step);
    trace(step);
}
b1.onPress=function(){
    number=0;
    number=number+1;
    score=score+1;
    step=step+1;
    moveframe=moveframe+1;
    _root.player._x = _root["square"+step]._x;
    _root.player._y = _root["square"+step]._y;
    _root.gotoAndStop(moveframe);
    _root.soal.gotoAndStop(step);
    trace(step);
}
c1.onPress=function(){
    number=0;
    number=number+1;
    score=score+1;
    step=step+1;
    moveframe=moveframe+1;
    _root.player._x = _root["square"+step]._x;
    _root.player._y = _root["square"+step]._y;
    _root.gotoAndStop(moveframe);
    _root.soal.gotoAndStop(step);
    trace(step);
}
d1.onPress=function(){
    number=0;
    number=number+1;
    score=score+1;
    step=step+1;
    moveframe=moveframe+1;
    _root.player._x = _root["square"+step]._x;
    _root.player._y = _root["square"+step]._y;
    _root.gotoAndStop(moveframe);
    _root.soal.gotoAndStop(step);
    trace(step);
}
e1.onPress=function(){
    number=0;
    number=number+1;
    score=score+1;
    step=step+1;
    moveframe=moveframe+1;
    _root.player._x = _root["square"+step]._x;
    _root.player._y = _root["square"+step]._y;
    _root.gotoAndStop(moveframe);
    _root.soal.gotoAndStop(step);
    trace(step);
}

Answer 1

In AS3 that would be something like that:

stop();

var score:int = 0;//skor total
var step:int = 1;//gerakan pemain
var moveframe:int = 4;
// this one is useless: number=0;//dadu

for each (var aButton:InteractiveObject in [a1,b1,c1,d1,e1])
{
    aButton.addEventListener(MouseEvent.MOUSE_DOWN, onButton);
}

function onButton(e:MouseEvent):void
{
    step++;
    score++;
    moveframe++;

    root.player.x = root.getChildByName("square"+step).x;
    root.player.y = root.getChildByName("square"+step).y;

    root.gotoAndStop(moveframe);
    root.soal.gotoAndStop(step);

    trace(step);
}

Keep in mind that you need do much more than just that if you want to have your app running on Android smoothly. Yet if you're doing it just for your own fun, then yes, just migrating to AS3 will suffice.