Member Avatar for stjohn999

hi all have a homework project have to come up with a html code for ducci's 4 number game using a fuction called difference(firstNumber secondNumber) can anyone help if i get this wrong i am in serious trouble please help

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  • Latest Post Latest Post by rajendra.parmar

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The thread is about implementing one Ducci step (and typically iterating it) for four numbers. posted a broken script and was right to ask for code; posted a working single-step example. Below are the concrete problems to watch for, a minimal correct approach, and safe testing tips so the logic is clear and repeatable.

Common problems in the posted attempt: syntax errors (extra commas in parameter lists, stray braces), misspelling length, re-declaring parameters as different values, wrong loop increment expressions, using two separate arrays where a single array and wrap-around indexing are needed, and failing to return values from functions. Also avoid using document.write for debugging in modern code; use console logging or breakpoints. Use modulo (i+1) % n for the last-element wrap-around and Math.abs when the absolute difference is required.

Minimal, clear implementation (original and compact):

function absDiff(a, b) {
  return Math.abs(a - b);
}

function nextDucci(seq) {
  var n = seq.length;
  var out = new Array(n);
  for (var i = 0; i < n; i++) {
    var j = (i + 1) % n;
    out[i] = absDiff(seq[i], seq[j]);
  }
  return out;
}

To run the full Ducci process and stop on all zeros or a repeat (cycle detection):

function iterateDucci(start, maxIter) {
  var seen = {};
  var cur = start.slice();
  for (var k = 0; k < maxIter; k++) {
    if (cur.every(function(x){ return x === 0; })) return {status: 'zeros', steps: k};
    var key = cur.join(',');
    if (seen[key]) return {status: 'cycle', steps: k};
    seen[key] = true;
    cur = nextDucci(cur);
  }
  return {status: 'max', steps: maxIter};
}

Testing tips: run small inputs in the browser console, step through with breakpoints, test the wrap-around case explicitly, and set a sensible maxIter to avoid infinite loops. For background theory, see the Ducci sequence entry: Ducci sequence.

Recommended Answers

All 10 Replies

Member Avatar for NickRx

Its not learning if your making someone else do it

Member Avatar for stjohn999

i dont want the answer i just need a little shoov in the right direction

Member Avatar for stjohn999

Its not learning if your making someone else do it

i only need a shoov in the right direction can you help

Member Avatar for almostbob

you start, we steer - once you begin
There are announcements above all the forums about homework
just how PO everybody who will answer is about homework
show a code example, and many will help straight off, otherwise you just get answers like this

Member Avatar for stjohn999

hi all this is what i have so far and its not working please help

<script>
var numberArray = [16,14,4,5];
var diffArray = new Array(4);
function difference(firstNumber, secondNumber,)
{
var firstNumber = numberArray.lenght;
var secondNumber = numberArray.lenght;
{
for (var count = 0; count < numberArray.length; count = count + 1)
{
diffArray[count] = firstNumber[count] - secondNumber[count + 1];
}

for (var count = 0; count < diffArray.length; count = numberArray + 1)
{
if (firstNumber > secondNumber)
{
firstNumber - secondNumber;
}
else
{
secondNumber - firstNumber;
}
}
{
document.write(difference() + ',');
}
}}
</SCRIPT>

Member Avatar for harrierdh

Your code is full of syntax errors. I think this is what you want. But, you really need to learn this stuff on your own.

<script>
difference();
function difference() {
	var numberArray = [16,14,4,5];
	var diffArray = new Array(4);
	var count = 0;
	var numLen = numberArray.length;
	for (count = 0; count < numLen; count++) {
		if ((count + 1) == numLen) {
			diffArray[count] = numberArray[count] - numberArray[0];
			alert("a " +numberArray[count] + " - " + numberArray[0] + " = " + diffArray[count]);
		} else {
			diffArray[count] = numberArray[count] - numberArray[count + 1];
			alert("b " + numberArray[count] + " - " + numberArray[count + 1] + " = " + diffArray[count]);
		}
	}
}
</script>
Member Avatar for newuser79

You can't use this for your answer on TMA03 question 4 of the m150open uni course as it is using java that is not in the books yet!

Member Avatar for stjohn999

im not at uni im only 15 still at school my teachures say i dont have the brains to go to uni

Member Avatar for newuser79

im not at uni im only 15 still at school my teachures say i dont have the brains to go to uni

Your using the same values as the question and the same function names. I'm not stupid so don't take me for a fool! Oh and in the other forum you are even showing the java with the same comments on it and date!

Member Avatar for rajendra.parmar

you can use html input object,


hi all have a homework project have to come up with a html code for ducci's 4 number game using a fuction called difference(firstNumber secondNumber) can anyone help if i get this wrong i am in serious trouble please help

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