How to avoid duplicate random questions

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I am making an application which is the FE Exam program wherein the user will take the test that compose of random questions.I'm having trouble in displaying the questions because there are some duplicates of questions.What method will I use or process in regards to this.Please help me.Thanks! :)

Much appreciated,
Rhea May :-D

[added]
Thanks for your idea!Can you give some codes pertaining the method to avoid the duplicates of questions?I just want to clarify it.
[/added]

Posted 15-Feb-10 15:09pm

Rhea May

Updated 17-Feb-10 8:37am

CPallini

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Do you have some codes using java technology in regards to the method of avoiding the duplicates of random questions instead of turbo C?Because I'm using java language.I need your help.Thanks!

Posted 19-Feb-10 16:12pm

Rhea May

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AspDotNetDev · Accepted Answer · 2010-02-15T15:13:00

Get a list of all the questions. Then randomly jumble them. You can do this by selecting a random index and copy that question to a new list. Then, move the list item in the first list to the position of the question you just selected. Then reduce the size of the first list by 1. Repeat this procedure until your first list is empty. Your second list will be in a random order and each item in the list will be unique.

That is one of many ways you could do this (e.g., you could use a hash table with a hash of the questions to ensure there are no duplicates).

CPallini · Accepted Answer · 2010-02-15T22:05:00

Solution 3

You may read my: "Random extraction of 5 cards from a deck".
Basically it shows how random extract items avoiding duplications (It is C, I know, but is heavy commented).
:)

Posted 15-Feb-10 22:05pm

CPallini

#realJSOP · Accepted Answer · 2010-02-15T23:28:00

You could randomly select them and add them to a HashTable.

The HashTable collection don't allow duplicate keys, so you could just keep retrieving randomly selected questions until your hash table contains the desired number of questions.

(I'm assuming your question object has some sort of unique identifier you can use as a key).

How to avoid duplicate random questions

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