The Cube
You just watched the movie ’Cube’ before going to bed. Bad idea – you find yourself in a nightmare where you are also put in a huge cube which has 6 doors. But fortunately you remember an idea from the film about how each of the doors has a numeric code. If decoded correctly it tells you if there is a deadly trap behind it or not.
You read the first code 28733 13412 96476 – and remember that one had to add the digits of each group together (e.g. 2+8+7+3+3 = 23) and test if at least one of the 3 check sums is a prime number. If it is, there is a deadly trap!
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title></title>
<link rel="stylesheet" type="text/css" media="screen" href="master.css" />
<script type="text/javascript" src="jquery.min.js"></script>
<!--[if IE]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<script type="text/javascript">
function isPrime(text){
var e = text.split(',');
for (var i=0; i<text.length; i++){
var num = 0;
for (pos = 0; pos < text[i].length; pos++) {
num = num + parseInt(text[i].charAt (pos))
}
console.info("Testing %i, the sum of digits %s.", num, text[i]);
if (num == 1 || num == 2) {
console.info("%i, the sum of digits %s, is prime!.", num, text[i]);
return true;
}
for (var divisor = 3; divisor < num; divisor++) {
if (num % divisor == 0) {
console.info("%i, the sum of digits %s, is prime!.", num, text[i]);
return true;
}
else {
console.info(num + ", the sum of digits " + text[i] + ", is not prime. It is divisible by " + divisor + ".");
break;
}
}
}
return false;
}
function isTrap(text){
if(isPrime(text)){
trap.play();
return "It's a Trap!";
}
return "It's safe!";
}
</script>
</head>
<body>
<form>
<div class="box">
<h1>Add and Prime</h1>
<label>
<span>Please enter first number</span>
<input type="text" class="input_text" id="number1"/>
</label>
<label>
<span>Tada</span>
<input type="text" class="input_text" id="result1"/>
<label>
<input type="button" value="Calculate" onclick="$('#result1').val(isTrap($('#number1').val()))">
</label>
</div>
<audio id="trap" src="itsatrap.mp3">
Your browser does not support the audio element.
</audio>
</body>
</html>
