I've learned about and understand HOW to do a bubble sort (theoretically), but I can't seem to wrap my head around how to use a bubble sort with array structures. I'm supposed to be able to sort the inputted student information (via textfile) using bubble sort and display the result in a listbox. Buttons for Sort by last name, sort by gpa, & sort by letter grade.
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I'm trying to implement a bubble sort on an 2 dimensional array. However the results after the bubble sort have not infact been sorted at all! I am trying to sort by the 7th item in the 2nd dimension. The other items are not important as they just contain other data but I would like to have the data kept together instead of creating another array for the bubble sort.
Public Function bubblesort()
Dim array(999, 7) As String
array = Home.userinfo 'Load the array from the Original form
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I have an array of structures:
Structure stCar
Dim Name As String
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Dim cn As String = ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Database genk.mdb;")
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I am trying to use bubble sort to sort to sort the deatils shown on the datagrid. The buuble sort code is there and the data grid view code is there which retrives the product details in my databse. How would i link the two together so that when the user clicks the button it uses the bubble sort code to sort and view the product deatils in order of the selected coulmn name selected by the user through a combo box?
ListBox2.Items.Clear()
Dim list() As Integer
Dim count As Integer = ListBox1.Items.Count
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View 10 RepliesI'm bubble sorting an array called number which starts at (1) and ends with (6), the code I'm currently using is this:[code]
View 2 Repliesi am trying to make a program with some numbers but idk how to put it in a bubble sort or write a bubble sort program here is the pseudo code for the program
Repeat
NoMoreSwaps ← True
For elemenr ← 0 to NumberOfItems -2[code]....
I am trying to create an applicaiton that will verify that a large text file used far a CNC machince
has all of the operations in order (someone may have edited the file by mistake) I wish to bubble
sort the lines of the file while ignroing other lines. I really stuck on how to set up and handle
this program. Here is what I have thus far (just started).[code...]
Sub Sort()
ReDim RollsCC(NumOfPlayers - 1)
For N As Integer = 0 To (NumOfPlayers - 1)[code]....
Here I am creating a temp single dimensional array, merging my 2d array into it, and then attempting to sort it by Rolls(N,1), which is a integer 1-6, Everything seems to be working right with the exception of this.
RollsCC.Sort(RollsCC, 0, 1)
How would one specify a numeral sort based on the first character in the string? im aware that I am switching Rolls(n,1) and Rolls(n,0) information during the sort.
I'm trying to bubble sort an array then display it in a list box. When I click the button the program crashes.
Here is my code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Not TextBox1.Text = "" Then
ListBox1.Items.Add(TextBox1.Text)
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And the compiler gives me this error: A first chance exception of type 'System.IndexOutOfRangeException' occurred in WindowsApplication1.exe
I am trying to sort my array in ascending&Descending order, BUT im having trouble because the code to enter numbers and the code to sort the array was given to me by my professor but i changed the code to enter numbers into the array, so i think that's what messing my code to sort arrays up because the codes aren't matching up.. Dim J As Integer = 0 Dim MyArray As New List(Of Integer)
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I am using the Array type .Sort function to sort my array.By default it places the result Array into Ascending order Least to Greatest How do I change that to Descending order Greatest to Least?and How do I change it to Closest to logic? or does that not exist?Assume there is an Array of Numbers 0,13,21,-2,4,5,1.34 and I want them to sort closest to 0 or some other arbitray value; the Output should look similar to:
0,1.34,-2,4,5,13,21
I have a 2D array which holds 5 students and two test results. I have initialised my array as studentTestResults(4,1) However, I am looking for a sorting algorithm which will displays the students in order of combined results when the user clicks "sort results". I have had a hard look around the net, but finding a bubble sort for a 2D array is difficult, especially as my knowledge is minimal.
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I have an array of structure and need to sort it using selection sort. I have to sort the array by the last name field in ascending order (A to Z). I dont understand how to use the selection sort method.
The code i have so far...
Public Class frmMain
Structure EmployeeInfo
Dim first As String
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I have a Structure, and I am having trouble initialising it. Specifically when I try to populate the Vector3 variables, it tells me that they are Nothing, so I need to make them New when the array of this structure is declared.[code]Structures cannot declare a non-shared 'Sub New' with no parameters.I have no parameter to supply, and this will be an array so I'm not even sure how I would supply it.The second option to fix the error is to make the Sub New shared, but then I get other errors: Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.Does anyone know how I can resolve this. My end goal is to have an array of this structure type with the Vector3s ready to use.
View 6 RepliesI need to have an Array of UDTs(Structures). Elements have to be added (at end) and removed (from anywhere). The different values of the elements need to be changeable.
I know how to implement it as an oldstyle array, but wouldn't it be better to implement as a List ( of T)? and if yes is such a procedure possible?[code...]
I have 2 Structures
Public Structure One
Public ItemOne As String
Public ItemTwo As Integer
End Structure
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Results In an Unhandled exception. Bad Record Length. and then If I close it and reopen it I get an 'Unable to read beyond end of stream' error. So what is the best way to save an array of structures? Binary Reader/Writer? and why does this way not work (Even if its derived from VB6)
I have a class file which contains a structure like this.
<StructLayout(LayoutKind.Explicit)> _
Public Structure SampleStructure
<FieldOffset(0)> Public field1 As Int16
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how to go about getting data populated from a data grid view to an array of structures? I have a data grid view with 6 fields and 10 records that match elements in my array. I declared a list of songs based off of my structure Song.
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Is it possible to have a checkbox in a bubble, so that when it show up in the tray you can check the box, i.e. "Don't Show this Again"
View 5 RepliesIs an ArrayList the same thing as a Structure (i.e. 'array of records')? If they're not the same think, what't the difference?
View 3 RepliesI am getting an error when helping someone with their code. They are trying to create an array of Items, but gets an error at ItemStruc(counter).ItemName = Contents(0)
I am not sure why. >_>
Structure is as follows:
public structure Item
dim itemName as String
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�On load read data from units.txt into an array of structures;�Allow the user to choose a major and then add units to a study plan.Note your program must not allow the user to add units not in the major and a unit can only be added once to a study plan;�Save student first name & last name, student number, unit codes to a user selected file (e.g. fred.txt); �Allow the user to select a student file to load using a common dialog control ;�Display the units for that student.
The program must have the following features:�It must use a common dialog control for saving data;�The program must have at least one general procedure; �The program must demonstrate the use of an array (array of structures recommended).I've attached a copy of the text file needed to be loaded.
I am trying to get the data from the text file to load into an array of structures and then be displayed in a listbox on FormLoad with no luck, all I get is a blank listbox.
Code:
Public Class frmMemList
'Create a structure to which data from text file MEMBERPHONES.TXT will be read.
Structure MemberList
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I am really struggling lately for some reason. I do not know why, but I can not get simple programming code to work, usually due to simple mistakes. Anyway, enough about that.Here is my code, I am trying to get the data from the text file to load into an array of structures and then be displayed in a listbox on F
Public Class frmMemList
'Create a structure to which data from text file MEMBERPHONES.TXT will be read.
Structure MemberList
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I am trying to create and initialize an array of structures of a fixed size. Each struct will be populated when a button is clicked. Here is an example of my struct:
public structure buttonStruct
dim x() as Boolean
dim y() as Boolean
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In my form_load function I am declaring the array of structs and:
Dim BtnStruct(15) As ButtonStruct
BtnStruct(0).Initialize()
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Whenever a specific button is clicked, I am trying to collect data and store it in the respective struct and so for example, if button 1 is clicked then I will store the data associated with button 1 into BtnStruct(0). The position of the button is stored in a public variable called BtnNum. If I attempt to store information in the struct inside another function as follows, I receive an error
BtnStruct(BtnNum).x(pos - 1) = temp "btnstruct is not declared. it may not be inaccessible due to its protection level"
I need to create a collection of millions of objects, each object has 3 double and one integer fields.If I remember (after more than 20 years without using C) in C you would allocate enough memory using a struct and an array, and read all the file content in one shot.In VB I created a class with the 4 members, and this constructor:
Sub New(BR As IO.BinaryReader)
X = BR.ReadDouble
Y = BR.ReadDouble
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I coded anything but I remember when using VB6 or Pascal/Delphi we used to define records/ structures with fixed length fields, then write those structures to a file knowing that they would always be the same length. You could then open a particular record within the file or simply find out how many records existed by reading the file length.From what I understand, it seems that such methods are depreciated in VB.NET and such structures are written as a stream.Does it now mean that we can define things like variable length strings and not need to worry about buffers or boundaries?Is it possible to read through such files and pick out individual records? Are there methods of determining how many records that exist in a file? What I'm looking to do is simply store multiple records of a structure in a file then retrieve them into an array so I can manipulate their order by sorting the array and search within the array. This is only a learning project so it is unlikely that the resultant array is going to be large, although if this is not generaly a good method of doing this then it might be interesting to fidn out what is. So far, I have read that they way to write a structure to a file is to "serialises" it and then write the bytes - is this correct?[code]
View 5 RepliesThese are the directions for the assignment.So far I am able to get the file read and printed onto a list box.The book we have for the class does not clearly talk about using the array of structure method with formatting an imported text file.After that I'm pretty much having a bit of trouble with everything else.I know I can figure most of it out but what I'm having a big amount of trouble with is the array of structures that he wants.I know that when I have the file imported that I need to save it temporarily and go through it and at every ":" put it in an array and save that spot and then keep scanning through the file. I know it is going to be a for loop using the index to count through but I'm not sure if how to start it.This is how the text file that he wants sorted out looks.
Ally Gators:Tim Tebow:240:280:250
Ally Gators:Albert Gator:150:175:222
Ally Gators:Joe Cool:195:220:217[code]...........