I am trying to make a calculator (how original) but I am also trying to make it like a console. I have a textbox in which you enter a command and a list in which the lines appear.
My question is how can I translate the plain text which the user enters i.e 3*(2+4) to a maths command so that VB can display the answer?
Is there a method to calculate an equation from a string that looks something like "(1 + 1) * 2"?
View 9 RepliesIs there a method to calculate an equation from a string that looks something like "(1 + 1) * 2"?
View 2 RepliesTrying to do some Maths in vb and have it all out put in lblCost.text
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim decTax As Decimal
Dim decTotal As Decimal
Dim decSubtotal As Decimal
[code]....
To Show "Total Cost inc. VAT & Delivery $233" E.g
Is there a way to use the string.split command to get a section of a string without using an intermediary array?for example, if my string is "1 2" and I want to get the "2" part using string.split(" "), is there a way to avoid creating a new array, and just get the bit of the string I want in a single line?
View 4 RepliesI ve done the main main page which includes a button which when pressed will go on the next page etc etc.
The problem that i am facing with is the concept behind creating the main function of the game.
I.e. Once the main screen comes up it will show a formulae eg 3 + 3. After the forumale is shown the user will input the answer and then when they want to go to the next question that click the next button which inturn shows a different question if the answer is correct, if not it will stay on the same forumale. I would also like to add a skip button that will allow the user to skip the question if they cant figure it out.
So yeah my main issue is programming it ( i mean i can add buttons and program them to link to places (and show messages) but that is all lol) .
incase i didnt menmtion earlier, i am using Visual Basic 2005
i have two textboxes where a numeric value will get entered into both, these values will then be taken and the first value divided by the second value. The problem i am having is that if for example the first value is 11 and the second value is 10, when i divide 11 by 10 the result is 1. I have tried setting the output format to have 2 decimal places but it still displays 1 instead of 1.1. [Code]
View 4 RepliesI am fairly new to programming so please bare with me. For my coursework, I am making a maths quiz which allows the teacher to add or edit questions and solutions. then these solutions and quetsions form a quiz that students can access.But I dont know how to allow the teacher to use the weird maths symbols. The quiz is only going to be about algebra so no complex symbols are required, I saw some of these symbols in unicode. But dont know how to make that symbol appear in textbox which the teacher is going to use to enter questions etc.
View 7 RepliesI would like to develop an application that involves a lot of tables and maths, and then displaying the results. I can visualize how this would work in SQL, as far as creating the stored procedures and tables required, however the front facing application would be a completely new experience to me.I would probably be sharing the built application with friends, but completely as a no profit tool. I assume that the developer edition of dot net is a suitable option? My main query is, is dot net really the best way to develop this tool? I have a strong feeling that I will not be able to use SQL as this would require a server to be run, and this is not practical. Can the tables be implemented into a DLL or similar to be used by the application for example?
View 4 RepliesIs this formula right just asking to see if I can make a file downloader on my own with fully working progress bar.
var/var2 * 100 = answer
I'm going to start delving into maths in vb Now want I want to do is convert the distance between two coordinates. I've found this linke below on the web. Does anyone have a link to good tutorial for this conversion?
View 7 RepliesTrying to get the magnetic track from two waypoints, but are getting error in the formula,
This is my code at the moment (produces error)
tc1.text = Math.Atan2((Math.Sin(lon1.Text - lon2.Text) * Math.Cos(lat2.Text)), Math.Cos(lat1.Text) * Math.Sin(lat2.Text) - Math.Sin(lat1.Text) * Math.Cos(lat2.Text) * Math.Cos(lon1.Text - lon2.Text))) 2 * pi)
i am running a Sub which takes as arguments a Datatable and a String.
Private Sub Populate(ByVal dttemp As DataTable, ByVal strWhichPart As String)
At one point there is a combobox which is populated with some of the data in the datatable. The name of the combobox is cmd plus the name of the string for example when the string is Person_FirstName the name of the combobox is cmbPerson_FirstName.Then i add items to the combobox like this:
cmbPerson_FirstName.Items.Add(strHold(rr))
My question is this can i make a String into a command? Because i have many comboboxes which have the same name as the string argument of the sub how can i do something like this to work
strWhichPart.Items.Add(strHold(rr))
in which strWhichPart is a string. Is there a command that i can execute a string as a command?
Here's my code
I seem to be getting an error SQL command cannot be converted to string with this code
Dim LogData2 As sterm.markdata = New sterm.markdata()
Dim query As New SqlCommand("Select * from openquery (db, 'SELECT * FROM table WHERE person=@person')")
query.Parameters.AddWithValue("@person", Session("number"))
[Code]...
I am trying to use the following code, however if my searchString variable contains a # (hash) then it is not being found. Why is this?
[Code]...
I am trying to use the following code, however if my searchString variable contains a # (hash) then it is not being found.
dim searchString as string = "*simon#*"
If line Like searchString Then
In the following code i want to replace 'Product7' (in the line : sql = "delete product where Product_name ='Product7'") with a string variable:
dim x as string
x = "example"
how to do it ?
Imports System.Data.SqlClient
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connetionString As String
[Code] .....
newUserCommand.CommandText = "INSERT INTO users(username, password, security) VALUES('" & newUserNameBox.Text & "';'" & newPassWordBox.Text & "';" & newUserSecurityBox.Text & ";'"
I cannot find where the syntax error is but vstudio tells me the error is in a unclosed quotation after ;
This question may have been asked before but I searched around a lot and I couldn't find the solution of what I need.Let's say I have a string like "Int(100/9)". How can I get the result I want, which is 11? I don't believe the MSScript Evaluate method would work on this one, would it?
View 15 RepliesIs there a way to "execute" a string variable as a command? [code]
View 9 RepliesThe command to a string to another inside lable text box
View 6 RepliesI have an application where the user and search the database and return the values from it. They can also figure the Average, Median, and the Standard Deviation from it. BUt I have a problem with this since the business rules won't allow the result column to be anything but a string so now I am getting error messages on the Select commnad text since it is trying to perform the calculations. I am wondering if there is a way to convert the values in the command text to a numeric value then perform the calculation. Here is the code I am using at the moment.
[Code]...
I'm using vb6 to invoke a function in a dll with the following argurments (
int argc, _TCHAR* argv[])
in vb6:this is how i call the function in the dll..
String command = "TEST 123 456"
module(3, command)
As you can see, command is of String type.. the parameter needed is _TCHAR*
_TCHAR* is in unicode. How do I convert my String to _TCHAR*??
I've been using SQL OleDB commands to grab data from some excel files and it's working well, but I'm having a really hard time finding a good resource for the actual command strings on the web. I figure I must not be using the proper terminology in my searches. Take this line:
Dim da as New OleDb.OleDbDataAdapter("Select * From [" & sheetName & "]", Conn)
My question this morning was: Can I pass a command that will grab all sheets from the excel document instead of just one in particular?
I have a problem with the code below as a SQL command string. Note: Using .Net Framework 4.0 in Visual Studio 10 Professional. Database is a Microsoft Access file. The idea is that this SQL command string will update a password within my database. Also note that I have tried the string below with and without the ";" at the end and it does not work either way. The problem is most likely extremely obvious, but I can't seem to find it. I have commented below the code what each part of the String is.
"UPDATE Users SET Password='" & tbx1.Text & "' WHERE Username = '" & sUsername & "';"
' Users is my Table name within the Database.
' Password is the field that I want to edit within the Users table.
' tbx1.Text is where the password is stored within a text box.
' Username is the field which I would like to compare with sUsername which is a variable within the code.
Solution was square brackets, Command string now looks like this:
"UPDATE Users SET [Password]='" & tbx1.Text & "' WHERE [Username]= '" & sUsername & "'"
What function in VB.NET simply takes a string parameter and runs a command? It would work just like the OK button in the Start -> Run dialog.[code]
View 3 RepliesI'm working with an eprom emulator in trying to understand the command string write instructions. Here is what I have. [code] From what I know, the values in hex need to be converted to decimal first. What I'm not sure about is the checksum value needed. The instructions say Checksum =(1 byte truncated addition of all the above).
View 4 Replies[code]Myself and a coworker have stared at this quite a lot and we can't figure out why it's not working. The problem is in the value for @ID (since it still works when I leave the other one parameterized). The funny thing is, Just a few lines of code above it I have a different query that sets a parameterized value for the same ID, using the the same choices list that the For Each loop is getting the match variable from.Choices is a list of longs, and when I use choices(0) to parameterize ID in a query, it works. But now down here in this loop I have the new match long, and it doesn't want to make it work for me.
View 1 RepliesFirst let me say that I am not sure whether or not this should go in this section or the API section, and if it needs to be moved I apologize. My issue is fairly straight forward, but for some reason I cannot get it to work.
I am trying to send a command to a command line and then submit the command. I have been trying without success to get this to work in v2008 Express and v2010 Express, Here is the code I am trying to us:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" ( _
ByVal lpClassName As String, _
ByVal lpWindowName As String _
[Code].....
User enter a command like 2+2 and instead of displaying 2+2 in the designated textbox 4 appears.
View 3 Replies