I have textbox receives number by the user.
the problem is that I want to format this textbox to show the numbers as the next face:
15000.25 >> 15,000.25
I used FormatNumber Function:
dim x as double
x = FormatNumber(textbox1.text,2)
textbox1.text = x
but here the problem is I want to keep the decimal places as entered by the user, examples:
15000.225 >> 15,000.225 NOT 15,000.22
0.00083 >> 0.00083 NOT 0
I hope my problem is clear.
I found the next solution:
Dim xStr As String = CStr(Me.Text)
Dim xCount As Integer = Len(Split(xStr, ".")(1))
Me.textbox1.Text = FormatNumber(Me.Text, xCount)
it's working for me.
thanks
Try this out:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim dbl As Double
If Double.Parse(TextBox1.Text, dbl) Then
Dim parts() As String = dbl.ToString.Split(".")
Dim strDecimalPattern As String = ""
If parts.Length = 2 Then
strDecimalPattern = New String("#", parts(1).Length)
End If
Dim strPattern As String = "{0:#,##0" &
If(strDecimalPattern <> "", ".", "") &
strDecimalPattern & "}"
TextBox1.Text = String.Format(strPattern, dbl)
End If
End Sub
Related
I am checking if a line in richtextbox is empty. If not, it will go at the next line.
The code I am using is:
Dim text as string="hello"
Dim lines = RichTextBox1.Lines
Dim upperBound = lines.GetUpperBound(0)
If lines(upperBound).Trim() = String.Empty Then
lines(upperBound) = text
RichTextBox1.Lines = lines
Else
RichTextBox1.AppendText(Environment.NewLine & text)
End If
Which is working perfectly. But just now I discovered that if Richtextbox1 is completely empty, this code will not add text to it. Is there any way to fix this little bug? Thanks
See if this does what you want:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim text As String = "hello"
If RichTextBox1.Text.Trim = "" Then
RichTextBox1.AppendText(titolo)
ElseIf RichTextBox1.Lines(RichTextBox1.Lines.GetUpperBound(0)).Length = 0 Then
RichTextBox1.AppendText(titolo)
ElseIf RichTextBox1.Lines(RichTextBox1.Lines.GetUpperBound(0)).Trim = "" Then
Dim lines = RichTextBox1.Lines
lines(lines.GetUpperBound(0)) = titolo
RichTextBox1.Lines = lines
Else
RichTextBox1.AppendText(Environment.NewLine & text)
End If
End Sub
You can try this very efficient system.
This is called LinQ for array, You can query an array for a empty line,
if the count is greater than 0 then exit(or give an error)
Dim text As String = "hello"
Dim lines = RichTextBox1.Lines
Dim qry = From n In lines
Where n = ""
Select n
If qry.Count > 0 Then
'you can give some error here
End If
Try:
Dim text as string="hello"
Dim lines = RichTextBox1.Lines
Dim empty = {""}
If lines.Length = 0 Then lines = empty
Dim upperBound = lines.GetUpperBound(0)
If lines(upperBound).Trim() = String.Empty Then
lines(upperBound) = titolo
RichTextBox1.Lines = lines
Else
RichTextBox1.AppendText(Environment.NewLine & text)
End If
So I've used visual basics (vb.net) for a bit now and understand some stuff. Right now I want to make a maths quiz that when I click a button it takes me to a new form and starts the quiz. When the quiz starts I want it so it gives the user random numbers and the user needs to answer it in a textbox and if correct it moves on to the next question (Basic, I should be able to do). IMPORTANT - my question is, there's a maths rule called BODMAS (Bracket.Order.Division.Multiply.Add.Subtract) and I want to add this rule into my coding instead of doing regular simple maths...
EXAMPLE question is 2 x (2+3) - 1 = ?
2 x 5 - 1 = ?
10 - 1 = ?
9 = 9
person writes answer to textbox and moves to next similar question
This is my first time using this but I wanted to write in-depth so people can understand. Please help me if you find a video explaining what I'm looking for or if someone has a file with a similar code I could download would be greatly appreciated!
Basically,you need to determine the range of numbers you use, and then match them randomly among '*', '/', '+', '-'. Then randomly insert brackets into it.
Private codeStr As String
Private Function GenerateMathsQuiz() As String
Dim r As Random = New Random()
Dim builder As StringBuilder = New StringBuilder()
'The maximum number of operations is five, and you can increase the number [5] to increase the difficulty
Dim numOfOperand As Integer = r.[Next](1, 5)
Dim numofBrackets As Integer = r.[Next](0, 2)
Dim randomNumber As Integer
For i As Integer = 0 To numOfOperand - 1
'All numbers will be random between 1 and 10
randomNumber = r.[Next](1, 10)
builder.Append(randomNumber)
Dim randomOperand As Integer = r.[Next](1, 4)
Dim operand As String = Nothing
Select Case randomOperand
Case 1
operand = "+"
Case 2
operand = "-"
Case 3
operand = "*"
Case 4
operand = "/"
End Select
builder.Append(operand)
Next
randomNumber = r.[Next](1, 10)
builder.Append(randomNumber)
If numofBrackets = 1 Then
codeStr = InsertBrackets(builder.ToString())
Else
codeStr = builder.ToString()
End If
Return codeStr
End Function
Public Function InsertBrackets(ByVal source As String) As String
Dim rx As Regex = New Regex("\d+", RegexOptions.Compiled Or RegexOptions.IgnoreCase)
Dim matches As MatchCollection = rx.Matches(source)
Dim count As Integer = matches.Count
Dim r As Random = New Random()
Dim numIndexFirst As Integer = r.[Next](0, count - 2)
Dim numIndexLast As Integer = r.[Next](1, count - 1)
While numIndexFirst >= numIndexLast
numIndexLast = r.[Next](1, count - 1)
End While
Dim result As String = source.Insert(matches(numIndexFirst).Index, "(")
result = result.Insert(matches(numIndexLast).Index + matches(numIndexLast).Length + 1, ")")
Return result
End Function
When you finish this, you will get a math quiz, then you need to know how to compile and run code at runtime.
Private Function GetResult(ByVal str As String) As String
Dim sb As StringBuilder = New StringBuilder("")
sb.Append("Namespace calculator" & vbCrLf)
sb.Append("Class calculate " & vbCrLf)
sb.Append("Public Function Main() As Integer " & vbCrLf)
sb.Append("Return " & str & vbCrLf)
sb.Append("End Function " & vbCrLf)
sb.Append("End Class " & vbCrLf)
sb.Append("End Namespace" & vbCrLf)
Dim CompilerParams As CompilerParameters = New CompilerParameters()
CompilerParams.GenerateInMemory = True
CompilerParams.TreatWarningsAsErrors = False
CompilerParams.GenerateExecutable = False
CompilerParams.CompilerOptions = "/optimize"
Dim references As String() = {"System.dll"}
CompilerParams.ReferencedAssemblies.AddRange(references)
Dim provider As VBCodeProvider = New VBCodeProvider()
Dim compile As CompilerResults = provider.CompileAssemblyFromSource(CompilerParams, sb.ToString())
If compile.Errors.HasErrors Then
Dim text As String = "Compile error: "
For Each ce As CompilerError In compile.Errors
text += "rn" & ce.ToString()
Next
Throw New Exception(text)
End If
Dim Instance = compile.CompiledAssembly.CreateInstance("calculator.calculate")
Dim type = Instance.GetType
Dim methodInfo = type.GetMethod("Main")
Return methodInfo.Invoke(Instance, Nothing).ToString()
End Function
Finally, you can use these methods like:
Private Sub GetMathQuizBtn_Click(sender As Object, e As EventArgs) Handles GetMathQuizBtn.Click
Label1.Text = GenerateMathsQuiz()
End Sub
Private Sub ResultBtn_Click(sender As Object, e As EventArgs) Handles ResultBtn.Click
If TextBox1.Text = GetResult(Label1.Text) Then
MessageBox.Show("bingo!")
TextBox1.Text = ""
Label1.Text = GenerateMathsQuiz()
Else
MessageBox.Show("result is wrong")
End If
End Sub
Result:
I want to compare the Textbox1 with TextBox2, or Textbox line 1 of the text box to the 2nd line, to show me the existing Character in another textbox, or show me how many characters are repeated. iI really like learning, so I would be helpful because I want to learn...
TextBox1.Text = 1,4,7,11,13,16,19,20,28,31,44,37,51,61,62,63,64,69,71,79,80
TextBox2.Text = 1,5,7,10,13,16,26,20,28,31,44,37,51,72,73,74,69,71,79,80
TextBox3.Text = Character Repeated: 1,7,13,16,20,28,31,44,37,51,69,71,79,80
TextBox4.Text = Number of Character Repeated = 14
TextBox5.Text = Number of Character which has not been repeated: 4,11,19,61,62,63,64 etc, you got to idea
TextBox6.Text = Number of Character isn't Repeated: 7
here are some codes: but I do not know how to apply them correctly.
Code 1: Show repetable character:
' Split string based on space
TextBox1.Text = System.IO.File.ReadAllText(Mydpi.Text)
TextBox2.Text = System.IO.File.ReadAllText(Mydpi.Text)
TextBox4.Text = System.IO.File.ReadAllText(Mydpi.Text)
For i As Integer = 0 To TextBox2.Lines.Count - 1
Dim textsrtring As String = TextBox4.Lines(i)
Dim words As String() = textsrtring.Split(New Char() {","c})
Dim found As Boolean = False
' Use For Each loop over words
Dim word As Integer
For Each word In words
TxtbValBeforeCompar.Text = TextBox1.Lines(i)
CompareNumbers()
If TextBox1.Lines(i).Contains(word) Then
found = True
Dim tempTextBox As TextBox = CType(Me.Controls("Checkertxt" & i.ToString), TextBox)
On Error Resume Next
If TextBox2.Lines(i).Contains(word) Then
If tempTextBox.Text.Contains(word) Then
Else
tempTextBox.Text = tempTextBox.Text + " " + TxtbValAfterCompar.Text()
End If
Else
End If
End If
Next
Next
Private Sub CompareNumbers()
'First Textbox that is to be used for compare
Dim textBox1Numbers As List(Of Integer) = GetNumbersFromTextLine(N1Check.Text)
'Second Textbox that is to be used for compare
Dim textBox2Numbers As List(Of Integer) = GetNumbersFromTextLine(TxtbValBeforeCompar.Text)
'Union List of Common Numbers (this uses a lambda expression, it can be done using two For Each loops instead.)
Dim commonNumbers As List(Of Integer) = textBox1Numbers.Where(Function(num) textBox2Numbers.Contains(num)).ToList()
'This is purely for testing to see if it worked you can.
Dim sb As StringBuilder = New StringBuilder()
For Each foundNum As Integer In commonNumbers
sb.Append(foundNum.ToString()).Append(" ")
TxtbValAfterCompar.Text = (sb.ToString())
Next
End Sub
Private Function GetNumbersFromTextLine(ByVal sTextLine As String) As List(Of Integer)
Dim numberList As List(Of Integer) = New List(Of Integer)()
Dim sSplitNumbers As String() = sTextLine.Split(" ")
For Each sNumber As String In sSplitNumbers
If IsNumeric(sNumber) Then
Dim iNum As Integer = CInt(sNumber)
TxtbValAfterCompar.Text = iNum
If Not numberList.Contains(iNum) Then
TxtbValAfterCompar.Text = ("")
numberList.Add(iNum)
End If
Else
End If
Next
Return numberList
End Function
Code 2: Remove Duplicate Chars (Character)
Module Module1
Function RemoveDuplicateChars(ByVal value As String) As String
' This table stores characters we have encountered.
Dim table(value.Length) As Char
Dim tableLength As Integer = 0
' This is our result.
Dim result(value.Length) As Char
Dim resultLength As Integer = 0
For i As Integer = 0 To value.Length - 1
Dim current As Char = value(i)
Dim exists As Boolean = False
' Loop over all characters in the table of encountered chars.
For y As Integer = 0 To tableLength - 1
' See if we have already encountered this character.
If current = table(y) Then
' End the loop.
exists = True
y = tableLength
End If
Next
' If we have not encountered the character, add it.
If exists = False Then
' Add character to the table of encountered characters.
table(tableLength) = current
tableLength += 1
' Add character to our result string.
result(resultLength) = current
resultLength += 1
End If
Next
' Return the unique character string.
Return New String(result, 0, resultLength)
End Function
Sub Main()
' Test the method we wrote.
Dim test As String = "having a good day"
Dim result As String = RemoveDuplicateChars(test)
Console.WriteLine(result)
test = "areopagitica"
result = RemoveDuplicateChars(test)
Console.WriteLine(result)
End Sub
End Module
You could make use of some LINQ such as Intersect and Union.
Assuming your TextBox1 and TextBox2 contains the text you have provided.
Here's a simple method to find repeated and non repeated characters.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim firstBoxList = TextBox1.Text.Split(",").ToList()
Dim secondBoxList = TextBox2.Text.Split(",").ToList()
Dim intersectionList = firstBoxList.Intersect(secondBoxList)
For Each str As String In intersectionList
TextBox3.Text = TextBox3.Text & str & ","
Next
TextBox4.Text = intersectionList.Count()
Dim notRepeatedCharacter = firstBoxList.Union(secondBoxList).ToList
notRepeatedCharacter.RemoveAll(Function(x) intersectionList.Contains(x))
For each str As String In notRepeatedCharacter
TextBox5.Text = TextBox5.Text & str & ","
Next
TextBox6.Text = notRepeatedCharacter.Count()
End Sub
The output is something like that:
This consider both of the textboxes not repeated character.
If you just want to find the not repeated characters from first list to the second, this should do it:
firstBoxList.RemoveAll(Function(x) secondBoxList.Contains(x))
For Each str As String In firstBoxList
TextBox7.Text = TextBox7.Text & str & ","
Next
TextBox8.Text = firstBoxList.Count
And this is the output:
Here's the full code using String.Join to make the lists look smoother in the text boxes:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'First we grab all the numbers written inside the textboxes (I am not verifying anything)
Dim firstBoxList = TextBox1.Text.Split(",").ToList()
Dim secondBoxList = TextBox2.Text.Split(",").ToList()
'Second we intersect the two lists and show them
Dim intersectionList = firstBoxList.Intersect(secondBoxList)
TextBox3.Text = String.Join(",", intersectionList)
TextBox4.Text = intersectionList.Count()
'We're checking the distintc character from both lists
Dim notRepeatedCharacter = firstBoxList.Union(secondBoxList).ToList
notRepeatedCharacter.RemoveAll(Function(x) intersectionList.Contains(x))
TextBox5.Text = String.Join(",", notRepeatedCharacter)
TextBox6.Text = notRepeatedCharacter.Count()
'we're checkng the distinct character inside first list that doesn't show in second list
firstBoxList.RemoveAll(Function(x) secondBoxList.Contains(x))
TextBox7.Text = String.Join(",", firstBoxList)
TextBox8.Text = firstBoxList.Count
End Sub
Structure TownType
Dim Name As String
Dim County As String
Dim Population As Integer
Dim Area As Integer
End Structure
Sub Main()
Dim TownList As TownType
Dim FileName As String
Dim NumberOfRecords As Integer
FileName = "N:\2_7_towns(2).csv"
FileOpen(1, FileName, OpenMode.Random, , , Len(TownList))
NumberOfRecords = LOF(1) / Len(TownList)
Console.WriteLine(NumberOfRecords)
Console.ReadLine()
There are only 12 records in the file but this returns a value of 24 for number of records. How do I fix this?
Contents of csv file:
Town, County,Pop, Area
Berwick-upon-tweed, Nothumberland,12870,468
Bideford, devon,16262,430
Bognor Regis, West Sussex,62141,1635
Bridlington, East Yorkshire,33589,791
Bridport, Dorset,12977,425
Cleethorpes, Lincolnshire,31853,558
Colwyn bay, Conway,30269,953
Dover, Kent,34087,861
Falmouth, Cornwall,21635,543
Great Yarmouth, Norfolk,58032,1467
Hastings, East Sussex,85828,1998
This will read the contents into a collection and you can get the number of records from the collection.
Sub Main()
Dim FileName As String
Dim NumberOfRecords As Integer
FileName = "N:\2_7_towns(2).csv"
'read the lines into an array
Dim lines As String() = System.IO.File.ReadAllLines(FileName)
'read the array into a collection of town types
'this could also be done i a loop if you need better
'parsing or error handling
Dim TownList = From line In lines _
Let data = line.Split(",") _
Select New With {.Name = data(0), _
.County = data(1), _
.Population = data(2), _
.Area = data(3)}
NumberOfRecords = TownList.Count
Console.WriteLine(NumberOfRecords)
Console.ReadLine()
End Sub
Writing to the console would be accomplished with something like:
For Each town In TownList
Console.WriteLine(town.Name + "," + town.County)
Next
Many ways to do that
Test this:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
dim FileName as string = "N:\2_7_towns(2).csv"
Dim Str() As String = System.IO.File.ReadAllLines(filename)
'Str(0) contains : "Town, County,Pop, Area"
'Str(1) contains : "Berwick-upon-tweed, Nothumberland,12870,468"
'Str(2) contains : "Bideford, devon,16262,430"
' etc...
'Sample code for string searching :
Dim Lst As New List(Of String)
Lst.Add(Str(0))
Dim LookingFor As String = "th"
For Each Line As String In Str
If Line.Contains(LookingFor) Then Lst.Add(Line)
Next
Dim Result As String = ""
For Each St As String In Lst
Result &= St & Environment.NewLine
Next
MessageBox.Show(Result)
'Sample code creating a grid :
Dim Grid = New DataGridView
Me.Controls.Add(Grid)
Grid.ColumnCount = Str(0).Split(","c).GetUpperBound(0) + 1
Grid.RowCount = Lst.Count - 1
Grid.RowHeadersVisible = False
For r As Integer = 0 To Lst.Count - 1
If r = 0 Then
For i As Integer = 0 To Lst(r).Split(","c).GetUpperBound(0)
Grid.Columns(i).HeaderCell.Value = Lst(0).Split(","c)(i)
Next
Else
For i As Integer = 0 To Lst(r).Split(","c).GetUpperBound(0)
Grid(i, r - 1).Value = Lst(r).Split(","c)(i)
Next
End If
Next
Grid.AutoResizeColumns()
Grid.AutoSize = True
End Sub
My Current Code
Public Class Form1
Dim randomObject As New Random()
Dim alphaRand As Integer = randomObject.Next(65, 91)
Dim alpha As String = Me.textAlphabet.Text.ToUpper
Dim asciicode As Integer = Asc(alpha)
If asciicode = alphaRand Then
Me.lblAlphaResult.Text = "Congratulation! Your guess: " & textAlphabet.Text & " is correct,you win"
Me.cmdAlphaNewGame.Enabled = True
Me.cmdAlphaGuess.Enabled = False
ElseIf asciicode < alphaRand Then
Me.lblAlphaResult.Text = "You guess is too low.Try again"
ElseIf asciicode > alphaRand Then
Me.lblAlphaResult.Text = "Your guess is too high.Try again"
End If
End Sub
End Class
*randomObject.Next(65, 91) ' which means it take generate random alpha to A-Z only according to asciicode , what about only vowels ?*
Can i use something like array
Dim vowels As String() = {"A", "E", "I", "O", "U"}
then generate the random alphabet from my string
for me to guess later
You can do something like
Dim vowels As String() = {"A","E","I","O","U"}
Dim i As Int32 = randomObject.Next (0, 5)
Return vowels(i)
or just use a string
Dim randomObject As New Random
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim vowels As String = "AEIOU"
Dim vowelpicked As String
vowelpicked = vowels.Substring(randomObject.Next(vowels.Length), 1)
Debug.Write(vowelpicked)
End Sub