//write a function printTriangle, accepts
//a height as parameter.
//assuming equilateral triangles
private function printTriangle(height:uint):void
{
    if (height == 0)
    {
        trace('Nothin');
        return;
    }
    var width:uint = (height - 1) * 2 + 1; //height - 1 because height of 0 is a single x's.
    var outStr:String = "";
    for (var h:uint = 0; h < height; ++h)
    {
        //a line consist of h*2 + 1 number of x's because one x for center, then h number of x's on each side.
        //Rest of space is left for O's. We have Width number spots, take away number of x's we have the o's.
        //write 0s, then write xs, then write rest of 0s.
        var numOfXs:uint = h * 2 + 1;
        var numOfOsHalf:uint = (width - numOfXs) / 2;
        //draw symbol o's
        outStr += drawSymbol('O', numOfOsHalf);
        outStr += drawSymbol('X', numOfXs);
        outStr += drawSymbol('O', numOfOsHalf);
        outStr += "\n";
    }

    trace(outStr);

    function drawSymbol(symbol:String, count:uint):String
    {
        var oStr:String = new String();
        for (var c:uint = 0; c < count; ++c)
        {
            oStr += symbol;
        }
        return oStr;
    }
}