How do I create an algorithm that calculates the average of a series of numbers?

Question

Also, how can I create an algorithm that describes the operation of a light that can be turned on or off using either of two switches?

All help is appreciated. Thanks. :D

Answer 1

Here's some code that figures the mean and median for a series of numbers stored in an array:

$mynumbers = new Array();
$len = array_length($mynumbers);
$mid = floor($len / 2);
foreach($mynumbers as $num) {
$total += $num;
}
$mean = $total / $len;
$median = $mynumbers[$mid];

Here's some JavaScript that describes the interoption of two single-pole, single-throw switches connected in series. False is off, true is on:

var switch1 = true;
var switch2 = true;

function toggleSwitch(switchID) {
switchID = !switchID // reverse global setting of switch
}

function circuitStatus() {
if($switch1 == true && $switch2 == true) {
alert('Circuit open!');
}
else {
alert('Circuit closed!');
}
}

Toggle Switch 1

Toggle Switch 2

Answer 2

First, have a running COUNT of numbers entered.
Second, have a running SUM of numbers entered.
At any time, average = SUM / COUNT.

Oh, and the light switch is an Exclusive OR function.
Light = Sw1 XOR Sw2