Random Numbers Behave Differently In Debugging Mode?
Oct 15, 2011
I use some random number generators in a piece of VB.net code to simulate Gene reproduction. It works as followed:
- I generate a male chromosome that contains 46 random chromosomes which I put in the Arraylist: MaleChromosomes.
- I generate a female chromosome that contains 46 random chromosomes which I put in the Arraylist: FemaleChromosomes.
- Then I have a piece of code that randomly picks 23 chromosomes from the female arraylist and randomly picks 23 chromosomes from the male chromosomes ( Very simple simulation of reproduction ) and put these in the arraylist: Child
- I repeat this for the second child ( Arraylist: Child2.)
- Now I have piece of code that compares these arraylist to see how many chromosomes the two children share.
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Dec 23, 2009
If you create new projects in C# and VB.NET, then go directly in the Immediate Window and type this:
? 567 / 1000
C# will return 0, while VB.NET will return 0.567.To get the same result in C#, you need to type
? 567 / 1000.0
Why is there this difference? Why does C# require the explicit decimal point after 1000?
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Dec 30, 2009
Example:
Dim Sh32 As Object = CreateObject("Shell.Application")
Dim path As String = "C: empcatalog.zip"
Dim sf As Object = Sh32.NameSpace(path)
-> does not work, sf = Nothing
Dim Sh32 As Object = CreateObject("Shell.Application")
Dim path As String = "C: empcatalog.zip"
Dim sf As Object = Sh32.NameSpace(path.ToString)
Clearly path = path.ToString, but they behave differently when used as COM parameters.
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Aug 3, 2009
I have code that has no output, it doesn't do what i want it to do, but i can't see any errors in it, there are also no errors in the compiler, but in debug mode there are the following errors:[code]
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Jan 6, 2009
I have code that has no output, it doesn't do what i want it to do, but i can't see any errors in it, there are also no errors in the compiler, but in debug mode there are the following errors:
A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
A first chance exception of type 'System.InvalidOperationException' occurred in
[code].....
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Aug 12, 2010
I keep receiving an "Access violation at address xxxxxx. Write of address xxxxxx." error when i close my MDI form (and hence my application).However this error only occurs after i have created a new child form.
I have stepped through the code and found that the exception is being thrown in the Settings.Designer file (Namespace My module). This is the chunk of code that throws the error[code]...
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Jun 2, 2006
When I am in break mode, I cannot update code.I receive message "Cannot currently modify this text in the editor. It is read only." Can anyone explain why I get this message?
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Jun 15, 2011
i wrote a piece of code to write some data to a card reader, and read back from that device, filling a form with the data (after reformat).When I step through the code while debugging (using F5, F8 for stepping forward) the form is filled correctly.However, when I run the code (Ctrl-F5), the program seems to hang for about 5 sec and then throws an exception: 'Length should be >0' When looking further during debug - it seems that the program calls 2x the Sub Frm_Read_Display(). I
Imports System.Windows.Forms
Imports System
Imports System.IO.Ports
Imports System.Threading
[code]....
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Dec 1, 2011
I am getting this error list when debugging my project also the project can not connect to sql server in debugging mode.[code]
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Apr 4, 2010
The class Random is out right defective. It always produces the same random numbers in the same sequence. Things I have tried so far is every kind of seed you can think of as well as Randomize. The result is that I always get the same random numbers in exactly the same sequence.
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Aug 16, 2009
So how would I use .next (random numbers) to randomly select something from a list of numbers but it can't repeat the number?I could do:
dim num as integer
dim r as new random
num = r.next(1,5)
if num = 1 then
elseif num = 2 then
etc.
That wouldn't work because it would repeat.If I donwload someone's game can I disect it in VS? :0 I tried going to open project, then I went to the folder and clicked open. It brought me inside of the folder so I tried to open the game but there is no form1 there. It says the games name then .exe in the explorer-like thing in the top right?Also, how would I have a value or something in a label and access it from a button.
Example:This is in a label.
Dim number as Integer
number = 0
Then in the button do
Label.number = 0
How would I do something like that? I want to use that a lot as I did in a different language.
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Oct 6, 2011
The program must generate 6 unique random numbers but when I click display numbers sometimes it gives me 6 unique numbers and sometimes I get duplicate numbers. I will add the code I have so far.
Public Class frmMain
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
[CODE]...
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Sep 16, 2010
What is the real mode , protected mode , supervisor mode and the hypervisor mode ?
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Feb 5, 2012
want to write a program that would have 4 boxes on the menu console:
Box 1) User input ( Ask the user to enter a number)
Box 2) Random Value
Box 3) Rolls value
Box 4) Counter
I want to write a If statement that shows the values of the rolls and the the counter count each time the user enters a number. If however I press the random box, a randomized number between 0-50 is generated and the counted is incremented by 1.
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Nov 24, 2009
I don't take programming lessons at school or anything, and I'm starting to (try to) teach myself about random things.Currently I'm making an app that has 3 functions:
-Random Integer (1 to 100)
-Random Answer (Yes or No, similar to a coin flip)
-Random Dice Roll (1 to 6)
How would I go about doing this?At the moment all I know about random numbers etc. is that I will need to do something along the lines of Dim dice As New Random or something like that, but, like I mentioned, I have no idea.I am well aware of the DIC rules that you won't write the code for me/do my "homework(?)" for me, and that's not what I'm asking.
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May 6, 2010
how do i find the Mode of an array of numbers.this is what i have so far, sacount1 is the max index
For j = 1 To SAcount1
If NFAI(j) = NFAI(j - 1) Then
x1 = x1 + 1[code].....
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Jan 10, 2010
Basically, I want to divide two numbers together and they should be 2 random numbers from 1-12 (I have done that part) but, the answer should be a whole number (i.e. Integer, so no decimal points etc) So, I did the following:
' Initialize the random-number generator.
Randomize()
' Generate random value between 1 and 12.
Dim value5 As Integer = CInt(Int((12 * Rnd()) + 1))
[code]....
but the problem here is that the program crashes after only a few clicks on the button. So I guess the question is: How can I make the program generate two numbers (from 1-12) that when divided become a whole number?(Is there any code that may tell the random generator that I want the numbers to be even?-so all even numbers from 1-12?)
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May 13, 2011
Say for instance, I gave you the numbers
1, 2, 3, 4, 4, 6, 9, 1, 3, 4, 5, 5, 2, 4, 7, 9, 1, 5, 3, 6, 6, 8, 1, 1, 4, 7, 7, 8, 2, 4, 2, 1, 9, 1, 0, 1, 6, 3, 2, 1, 8, 8, 9, 8, 1, 5, 3, 2, 3, 4, 7, 9, 0, 1, 2, 4, 7, 4, 3, 9, 7, 2, 0, 1, 6, 3, 8, 1, 2, 4
What number appears more than any other number?This is very important to me, ...I need to find the MODE, of those group of numbers, ...the way that I did it before, I would make 10 TextBoxes, and have another text box to enter the number, and when the number gets entered it would increment the value of which ever textbox the number was in the main textbox, so if I entered a 1 into the main textbox, then the zero in textbox (1), would be incremented to 1, and if another 1 was enered and the button was clicked, the 1 in the Textbox for 1, would be incremented to 2, because 1 has a popularity of 2 now and has apeared 2 times..
Here's some code, to show what I've come up with by myself.
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
ONE.Text = ONE.Text + 1
End If
[code]....
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Jul 3, 2009
i want to know how to generate 7 "differents" random numbers.
I need to use a tab() with 7 entries and verify(with a loop?) if the generated number is or not present in the the table, if not then increment a counter by 1 and add the number in the table and increment the table position by 1 for the next randomized number.
Im not sure how to do the verification, so far all i have is a function i made for the random number between min and max:
Private Function randGen(ByVal min As Integer, ByVal max As Integer)
Dim random As New Random()
Dim i As Integer
[Code]....
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Jul 11, 2009
I want to get random numbers between 0 to 100..But i do not want the random number to be repeated.
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim objRand As New Random
objRand.Next(0, 100)
End Sub
Suppose first time random numb generated is 10..Next time if same random number is generated,den i want to get the other random number..I want to get all the numbers b/w 1 to 100..but only one time
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Jul 11, 2009
I want to get random numbers between 0 to 100..But i do not want the random number to be repeated.
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim objRand As New Random
objRand.Next(0, 100)
End Sub
Suppose first time random numb generated is 10..Next time if same random number is generated,den i want to get the other random number. I want to get all the numbers b/w 1 to 100..but only one time
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Jun 25, 2010
I want to random a numbers about 20 second. how to write the code
[Code]...
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Jul 19, 2011
i need to add random numbers in list box like
0
2
1
3
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Jun 21, 2010
i am trying to create a messagebox which brings up four random percentages which add unto 100%, i can create the messagebox with[code]messagebox.show ("") {icode]
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Jul 14, 2011
I am writing an application that needs several random numbers. Each time I use the Rnd() function, do I need to precede it with the Randomize() initializer?Or can I just use Randomize() once at the beginning of the code?Examples: Do I need to do it this way?
[Code]...
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May 1, 2012
'm attempting a program and need to generate 10 random numbers between 1 and 52. However all the numbers must be different. I'm trying this in a For Loop. I'm not terribly amazing at this so all I have so far is:
Dim B, I, J, max, min, card() As Interger
max = 52
min = 1
Randomise()
[Code].....
What am I doing wrong and what is the ultimately simple solution I know the internet can provide for me?
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Jan 9, 2010
This code is in VB6.0I have 28 numbers in sequence (eg 1-28), they are randomly generated and displayed in a label. I dont want a duplicate number displayed in the label. Pls how do I do this. Below is how I generate numbers at random. Now I want to make sure there is no duplicate number displayed in the label.[code]
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Mar 14, 2012
i have a few questions about generating random numbers:1) is it possible for the programme to generate a random number that it has previously generated (i.e could it produce the same number more than once?)2) can you specify what numbers to generate? e.g only whole numbers up to 1000?
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Nov 9, 2009
I have a problem regarding the generation of random numbers in vb.net..I have code like this!!it generates the random number but both the numbers are same for my program the should not be same!![code]
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Aug 30, 2009
So if you have one button and one textbox; whats the code so when you press the button the textbox comes up with a random number?
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