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Actionscript 3: How to make movieclip variables work with variables on stage (Healthbar Help)
var health:Number = 0;

if(health == 0)
{
        gotoAndStop("1")
}

if(health == 1)
{
        gotoAndStop("2")
}

if(health == 2)
{
        gotoAndStop("3")
}

var health:Number = 0;

fortyfiveup_btn.addEventListener(MouseEvent.CLICK, fortyfiveupClick);
function fortyfiveupClick(event:MouseEvent):void{
    health = health+45
}

//You can delete the var health:Number = 0;
fortyfiveup_btn.addEventListener(MouseEvent.CLICK, fortyfiveupClick);
function fortyfiveupClick(event:MouseEvent):void{
    //You can write this, too: lifebar.health += 45;
    lifebar.health = lifebar.health+45;
}

gotoAndStop(health + 1);

//Don't let health decrease below 0
if(health < 0) health = 0;
//And don't above 100
else if(health > 100) health = 100;
gotoAndStop(health + 1);

health:int = 0;