I don't understand this code example with Math.random()

[jamesp67108574]

import flash.events.MouseEvent;

stop();

var x:int=0;

var y:int=0;

addEventListener(MouseEvent.CLICK,startMove);

function startMove(m:MouseEvent){

x=int(Math.random()*10-5);

y=int(Math.random()*10-5);

removeEventListener(MouseEvent.CLICK,startMove);

addEventListener(MouseEvent.CLICK,stopMove);

addEventListener(Event.ENTER_FRAME,moveMe);

}

dx=int(Math.random()*10-5);

     What does the 10 and the 5 represent? How do I make it a minimum of one number and a maximum of another?

[JoãoCésar · Accepted solution]

Hi.

Math.random() returns a number from 0 to 1. So:

- If Math.random() returns 0, than 0 * 10 - 5 = -5;

- If Math.random() returns 1, than 1 * 10 - 5 = 5.

This means you're gonna get a floating-point number in a range from -5 to 5. -5 being the minimum value and 5 the maximum value.

As the result is being rounded using the int class, you get the closest integer that is less than or equal to the specified number or expression. With this being said, the results are:

-4, -3, -2, -1, 0, 1, 2, 3, 4

If you want to include -5 and 5, use Math.round() instead of int().

I hope this makes sense.

Regards,

JC