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var numbers:Array= [ num0_btn, num1_btn, num2_btn, num3_btn, num4_btn, num5_btn, num6_btn, num7_btn, num8_btn, num9_btn];
var operators :Array = [add_btn, subtract_btn, multiply_btn, divide_btn, equal_btn];
var op:String;
var num1:Number;
var num2:Number;

//this defines the click sound location and loads it
var sound:Sound = new Sound();
var req:URLRequest = new URLRequest (“http://say-web.com/SWF/click.mp3″);
sound.load(req);

function addListeners():void
{

for (var i:uint=0; i < numbers.length; i++){
numbers[i].addEventListener(MouseEvent.CLICK,pressNumber);}

for (i=0;i

operators[i].addEventListener(MouseEvent.CLICK,pressOperator);

}

clear_btn.addEventListener(MouseEvent.CLICK, clearAll);
dot_btn.addEventListener(MouseEvent.CLICK,addDot);

}

function pressNumber(event:MouseEvent):void {
var instanceName:String=event.target.name;
var numPushed= instanceName.charAt(3);
if (window_txt.text =="0" || num1 == Number(window_txt.text)) {
//This will remove the initial zero on the screen
window_txt.text=""; }

window_txt.appendText(numPushed);
sound.play();
}

function pressOperator(event:MouseEvent):void {
sound.play();
var instanceName:String= event.target.name;
var currentOp:String;
// This will store the current operation

currentOp = instanceName.slice(0,instanceName.indexOf("_"));

if (!num1){

num1= Number(window_txt.text);
window_txt.text = "";
op = currentOp;

}

else if (!num2){
num2=Number(window_txt.text);
showCalculation();
op = currentOp;

}
}
function clearAll(event:MouseEvent):void {
// This will put the zero back in the text box
// and erase any possible value to be processed

window_txt.text = "0";
num1 = NaN;
num2 = NaN;

// This will play the click sound
sound.play();

}
function addDot(event:MouseEvent):void {
//this will place a zero when asking for
// a decimal dot

if (num1 == Number(window_txt.text)){

window_txt.text= "0"; }

//The indexOf property will return -1
// if a given character is not part of a string

if (window_txt.text.indexOf(".")==-1){

window_txt.appendText(".");}

// This will play the click sound
sound.play();

}

function showCalculation():void{

switch (op){

case "multiply":
num1*=num2;
break;

case "divide":
num1/=num2;
break;

case "subtract":
num1-=num2;
break;

case "add":
num1+=num2;
break;

default:
break;

}

//now that we found out the result
//let's display on the window

window_txt.text=String(num1);
num2=NaN;

}

window_txt.text= "0";
addListeners();

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