I have a text file that reads:
Left Behind,Lahaye,F,7,11.25
A Tale of Two Cities,Dickens,F,100,8.24
Hang a Thousand Trees with Ribbons,Rinaldi,F,30,16.79
Saffy's Angel,McKay,F,20,8.22
Each Little Bird that Sings,Wiles,F,10,7.70
Abiding in Christ,Murray,N,3,12.20
Bible Prophecy,Lahaye and Hindson,N,5,14.95
Captivating,Eldredge,N,12,16
Growing Deep in the Christian Life,Swindoll,N,11,19.95
Prayers that Heal the Heart,Virkler,N,4,12.00
Grow in Grace,Ferguson,N,3,11.95
The Good and Beautiful God,Smith,N,7,11.75
Victory Over the Darkness,Anderson,N,12,16
The last element of each line is a price. I would like to add up all the prices. I've been searching for so many hours now and cannot find a thing to answer my question. This seems soooo easy but I cannot figure it out!!! Please help out. BTW, this list is bound to change (adding of lines, deletion of lines, altering of lines) so if you can, please nothing concrete but instead leave the code open to changes. Thanks!!!
Just so you can see my pooooorrrr work, here is what I have (I think I deleted my code and rewrote a different way for several hours now.):
Dim Inv() As String = IO.File.ReadAllLines("Books.txt")
Dim t As Integer = Inv.Count - 1
Dim a As Integer = 0 to t
Dim sumtotal As String = sumtotal + Inv(4)
also,
for each line has either an "F" or an "N". how do I add up all the F's and all the N's. Do I do it via if statements?
First, you'll be better off using Double as your type instead of String. Second, observe how I use the Split function on each line, cast its last element as a double, and add it to the total. Yes, using an If Statement is how you can determine whether or not to add to the count of F or the count of N.
Dim lstAllLines As List(Of String) = IO.File.ReadAllLines("Books.txt").ToList()
Dim dblTotal As Double = 0.0
Dim intCountOfF As Integer = 0
Dim intCountOfN As Integer = 0
For Each strLine As String In lstAllLines
Dim lstCells As List(Of String) = strLine.Split(",").ToList()
dblTotal += CDbl(lstCells(3))
If lstCells(2) = "F" Then
intCountOfF += 1
Else
intCountOfN += 1
End If
Next
Related
In VB.net (Visual Studio 2015) how can I get the nth string (or number) in a comma-separated list?Say I have a comma-separated list of numbers like so:13,1,6,7,2,12,9,3,5,11,4,8,10How can I get, say, the 5th value in this string, in this case 12?I've looked at the Split function, but it converts a string into an array. I guess I could do that and then get the 5th element of that array, but that seems like a lot to go through just to get the 5th element. Is there a more direct way to do this, or am I pretty much limited to the Split function?
In case you are looking for an alternative method, which is more basic, you can try this:
Module Module1
Sub Main()
Dim a As String = "13,1,6,7,2,12,9,3,5,11,4,8,10"
Dim counter As Integer = 5 'the number you want (in this case, 5th one)
Dim movingcounter As Integer = 0 'how many times we have moved
Dim startofnumber, endofnumber, i As Integer
Dim numberthatIwant As String
Do Until movingcounter = counter
startofnumber = InStr(i + 1, a, ",")
i = startofnumber
movingcounter = movingcounter + 1
Loop
endofnumber = InStr(startofnumber + 1, a, ",")
numberthatIwant = (Mid(a, startofnumber + 1, endofnumber - startofnumber - 1))
Console.WriteLine("The number that I want: " + numberthatIwant)
Console.ReadLine()
End Sub
End Module
Edit: You can make this into a procedure or function if you wish to use it in a larger program, but this code run in console mode will give the output of 12.
The solution provided by Plutonix as a comment to my question is straightforward and exactly what I was looking for, to wit:result = csv.Split(","c)(5)In my case I was incrementing a variable each time my program ran and needed to get the nth character or string after the incremented value. That is, if my program had incremented the variable 5 times, then I needed the string after the 4th comma, which of course, is the 5th string. So my solution was something like this:result = WholeString.Split(","c)(IncrementedVariable)Note that this is a zero-based variable.Thanks, Plutonix.
how i can figure the highest number in my array...below is the code...can someone help me to solve my problems...n i wan to show the result in the label from the other windows form....thank u... :
Public Class Frm2
Public Parties(9) As String
Public Votes(9) As String
Dim vote As Integer
Dim Party As String
Party = TParty.Text
vote = TVote.Text
For I As Integer = 0 To Parties.Length - 1
If Parties(I) = "" Then
Parties(I) = TParty.Text()
For J As Integer = 0 To Votes.Length - 1
If Votes(J) = "" Then
Votes(J) = TVote.Text()
MsgBox(TParty.Text & TVote.Text & " votes")
TParty.Clear()
TVote.Clear()
Exit Sub
End If
Next J
End If
Next
MsgBox("you can vote now")
If you want to use an algorithm to find the highest number into an array (let's say Votes), the classic is coming from the so-called Bubble Sort:
Dim max As Long 'change the type accordingly, for example if votes are 1-10 then Integer is better
max = Votes(0) 'set the first vote as the max
For j = 1 To Votes.Length - 1
If Votes(j) >= max Then max = Votes(j) 'if another element is larger, then it is the max
Next j
Now the variable max stores the highest value of the array Votes, that you can show anywhere as, for example, in MyForm.MyLabel.Text = max. More useful info here.
Please note that now you declare Public Votes(9) As String, which means they are strings so not usable as numbers. You might want to declare them with a different data type, or use the CInt() method to convert strings in integers as suggested by ja72.
I thought this would only work with a Variant array, but in quick testing it seems to work with an array of Longs as well:
Dim Votes(9) as Long
Dim Max As Long
Max=WorksheetFunction.Max(Votes)
Note that, as Matteo says, you should change Votes() to an array of numeric types. I'd use Long, as it's a native VBA type.
EDIT: As noted by Dee, the code in this question is actually VB.Net. I added that as a tag. In VBA the solution would be even simpler, as Max is an array property:
Max=Votes.Max
(I suppose it would be a good idea to change the variable name from "Max".)
I'm looking to optimise my code. Specifically this process
Calculate a group of locations (basically squares on a grid)
Have a list of all the locations that have been calculated
Then I go through all these locations, 1 at a time.
The issue I'm having is removing or not including duplicate locations in the list. I've tried having a list of integers (integers to represent the location) but it's still very slow. To give you an idea of the numbers: I'm talking at least 15,000 different location calculations and around 1,000,000 possible locations.
Any help on this would be much appreciated!
Here is how I remove duplicates from an string array, perhaps it will be of help to you:
Dim OneDimensionalTable(1000) As String
....
OneDimensionalTable = RemoveDuplicates(OneDimensionalTable)
.....
Private Function RemoveDuplicates(ByVal items As String()) As String()
Dim noDupsArrList As New ArrayList()
For i As Integer = 0 To items.Length - 1
If Not noDupsArrList.Contains(items(i).Trim()) Then
noDupsArrList.Add(items(i).Trim())
End If
Next
Dim uniqueItems As String() = New String(noDupsArrList.Count - 1) {}
noDupsArrList.CopyTo(uniqueItems)
Return uniqueItems
End Function
This should be fairly simple but I'm having one of those days. Can anyone advise me as to how to replace the first and third occurrence of a character within a string? I have looked at replace but that cannot work as the string could be of different lengths. All I want to do is replace the first and third occurrence.
There is an overload of the IndexOf method which takes a start position as a parameter. Using a loop you'll be able to find the position of the first and third occurences. Then you could use a combination of the Remove and Insert methods to do the replacements.
You could also use a StringBuilder to do the replacements. The StringBuilder has a Replace method for which you can specify a start index and a number of characters affected.
aspiringCoder,
Perhaps something like this might be useful to you (in line with what Meta-Knight was talking about <+1>)
Dim str As String = "this is a test this is a test this is a test"
Dim first As Integer
Dim third As Integer
Dim base As Integer = 0
Dim i As Integer
While str.length > 0
If i = 0 Then
first = str.IndexOf("test")
else if i = 2 Then
third = base + str.IndexOf("test")
end if
base = base + str.IndexOf("test")
str = str.Remove(0, str.IndexOf("test") + "test".length -1 )
i++
End While
It might have a one-off error somewhere...but this should at least get you started.
I have built a blog platform in VB.NET where the audience are very young, and for some reason like to express their commitment by repeating sequences of characters in their comments.
Examples:
Hi!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3
LOLOLOLOLOLOLOLOLOLOLOLOLLOLOLOLOLOLOLOLOLOLOLOLOL
..and so on.
I don't want to filter this out completely, however, I would like to shorten it down to a maximum of 5 repeating characters or sequences in a row.
I have no problem writing a function to handle a single repeating character. But what is the most effective way to filter out a repeating sequence as well?
This is what I used earlier for the single repeating characters
Private Shared Function RemoveSequence(ByVal str As String) As String
Dim sb As New System.Text.StringBuilder
sb.Capacity = str.Length
Dim c As Char
Dim prev As Char = String.Empty
Dim prevCount As Integer = 0
For i As Integer = 0 To str.Length - 1
c = str(i)
If c = prev Then
If prevCount < 10 Then
sb.Append(c)
End If
prevCount += 1
Else
sb.Append(c)
prevCount = 0
End If
prev = c
Next
Return sb.ToString
End Function
Any help would be greatly appreciated
You should be able to recursively use the 'Longest repeated substring problem' to solve this. On the first pass you will get two matching sub-strings, and will need to check if they are contiguous. Then repeat the step for one of the sub-strings. Cut off the algo, if the strings are not contiguous, or if the string size become less than a certain number of characters. Finally, you should be able to keep the last match, and discard the rest. You will need to dig around for an implementation :(
Also have a look at this previously asked question: finding long repeated substrings in a massive string