random seating arrangement

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hello i want to know how i can make a random seating arrangement for 20 students in a class in which no student has the same seat number in vb.net

Posted 21-Mar-12 1:58am

sherry1990

Updated 21-Mar-12 2:00am

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[no name] 21-Mar-12 8:00am

Sounds like homework.

What have you tried?

sherry1990 21-Mar-12 9:04am

i made a list by dragging and dropping a list from the toolbox and filled it with integer values from (1-20)
a loop that will run 20 times is
for (int i=0;i<=20;i++)

ZurdoDev 21-Mar-12 8:18am

What is the specific question?

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OriginalGriff · Answer 1 · 2012-03-21T02:26:00

Solution 1

Only allow one student to sit on each seat. Problem solved.

As this is your homework, I won't give you code. However, how I would do it:
Create a List of seat numbers, populate it with numbers in ascending order.
Create a Random variable, and run a loop.
Inside the loop, generate a random number with a maximum of the number of elements in the List.
Get the value for the set number at that location - that is where the student will sit.
Remove the element from the list, using List.RemoveAt
Repeat while there are elements in the list.

Posted 21-Mar-12 2:26am

OriginalGriff

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sherry1990 21-Mar-12 8:51am

hello i tried this:
<pre lang="vb">

Dim x as integer
Dim rd as new Random
for(x=1;x>0:x++)
x=rd.Next(1,21)

</pre>
i am having trouble with this part:
Get the value for the set number at that location - that is where the student will sit.
Remove the element from the list, using List.RemoveAt
Repeat while there are elements in the list.

OriginalGriff 21-Mar-12 8:55am

Ok, that code won't work at all - as you probably know since you will have tried to execute it.

Do you know how to set up a List of integers?
Do you know how to add things to the list?
Do you know how a create a loop which will run twenty times?

sherry1990 21-Mar-12 9:01am

yes i know how to make a list we just drag and drop a list from the toolbox and fill it with integer values from (1-20)
a loop that will run 20 times is
for (int i=0;i<=20;i++)

OriginalGriff 21-Mar-12 9:09am

Well, you want to make the list programatically - in code instead of by drag and drop:

Dim availableSeats As New List(Of Integer)()

Your "for" loop won't work in VB either - assuming the ':' is supposed to be a ';' that is a C, C++ or C# loop construct.

For i As Integer = 0 To 19
availableSeats.Add(i)
Next

Will give you a list of twenty available seats.
Now try the next part.

sherry1990 21-Mar-12 9:19am

hello i tried it but
it gave me an error :
that "add" is not a member of "System.Windows.Forms.Listbox" what should i do?

OriginalGriff 21-Mar-12 10:36am

Read what I wrote carefully, and compare it against your code version? :laugh:

OriginalGriff 21-Mar-12 10:38am

Reading your previous posts: When you said "drag it from the tool box" you meant a ListBox, didn't you? A List is a different animal - it doesn't appear in the toolbox (or on your form). It is just what the name describes: a list, like a list of items on a piece of paper.

sherry1990 21-Mar-12 11:07am

ok i get it,,but i am not quite sure where to put this code Dim availableSeats As New List(Of Integer)()
For i As Integer = 0 To 19
availableSeats.Add(i)
Next
should i put it inside a button?

OriginalGriff 21-Mar-12 11:20am

If your want it to execute when you press a button, then yes.

Myself, I would create a method called "AllocateSeating" and call that from the button, or from the form load event, or wherever I needed.
Remember that this code only does a small part of the whole task!

sherry1990 21-Mar-12 11:22am

can anyone plz help mee?

sherry1990 21-Mar-12 11:29am

hello, i placed this code inside a button, but when i execute the code nothing happens :S

OriginalGriff 21-Mar-12 11:40am

As I said - "Remember that this code only does a small part of the whole task!"
That does the first bit: "Create a List of seat numbers, populate it with numbers in ascending order."
Can you do the next bit: "Create a Random variable, and run a loop." If you can, try the loop contents as well.

sherry1990 21-Mar-12 11:50am

ok i did the first part. now everything is working but now how do i prohibit a number of appearing twice?

sherry1990 21-Mar-12 11:51am

like i dont want any value to appear more than once

sherry1990 21-Mar-12 12:13pm

hello can any1 plz help mee?

OriginalGriff 21-Mar-12 12:46pm

Look at my last comment - can you do the next bit? You need to do each of the steps in the description I originally gave you, in the order I gave them.

Sergey Alexandrovich Kryukov 21-Mar-12 19:20pm

What, more help?! What your school teaches you then? :-)
--SA

Sergey Alexandrovich Kryukov 21-Mar-12 19:19pm

My 5. You spent enough time already. Patience should not be infinite... :-)
--SA

sherry1990 22-Mar-12 9:10am

i solved it :)

OriginalGriff 22-Mar-12 9:14am

Good for you!
What did you do?