I have made calculator in visual basic that can calculate the costs of products. You first select the type of product. Then you insert the dimensions. After that it calculates de costs. The type op products are stored in a Access database. In this database is stored a formula as a string. The problem is that i can't caculate the selected string with the formula and the given dimensions.
View 10 RepliesI am reproducing a program written in C to vb.net and I am getting different results on a math formula. I am sure it is something simple that I am overlooking. Here is the formula in C
num = (10 * 9 * 80900 * 0501) & 0xffff;
Here is the same formula in vb.net
num = (10 * 9 * 80900 * 0501) AND &HFF
After converting all degrees-->decimal, and decimal-->hours, how can i use Tan, Cos and Sin formula in vb.net? I want the user must enter an input (which it is a coordinat-->i already convert the degrees-->decimal value as suggested by stanav and paul.
The questions like this (i only calculate on paper but dont know how to implement in code):
Input user need to enter:
-latitude local (e.g. 1.4875)
-longitude local (e.g. 103.3883333)
[CODE]...
In the user input of a textbox I would like that the user can input a formula to make it easier for him. So instead of inputing 400 I would like the user to have the possibility to input as 8*50. Is there a command for vb2008 to calculate the answer of this formula inputed by a string ?
View 2 RepliesIt's possible to calculate a string that has a formula something like:
dim val as integer
dim formula as string = "(5/1.5) + 10"
val = formula
And the result should be 13.33
I have a text box for user key in a formula,like '1+3-5',and i need to solve and display the answer.
Also need to handle the brackets,like '9+(2*4)'.
Operation is plus,minus,multiply,devide.
I have a question about storing formulas on a database and bringing them back in as a string. I want to have the user enter in a width and that number will be passed to intWidth. Lets say a user enters 8 into txtWidth, strRange will = "Less Than 10" and in the database I will have a Width_Range column with "Less Than 10" and a corresponding Equation column to go with it. If I have a formula such as (1800 * 1.8) saved in that database column, the code I have works and does the calculation.
[Code]...
I want to place two radio buttons in so I can select one of them to use one formula, and then select the other to use another formula. I want to use the I=P(1+r)^n formula and I=P(1-r)^n formula with the radio button text showing Appreciation and Depreciation.
Heres my copy of the original code.
Public Class Form1
Private Sub cmdExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdExit.Click
End
End Sub
[CODE].......................
I'm having a problem converting a string of letters to a string of numbers. I've tried:
Dim A As String = ""
Dim strOutput As String = ""
Dim X As Integer = 0
[Code].....
i am converting a string to double?i would like to know in advanced whether it would case an error to convert a string to a double. for example if i try to convert "hello" to a double, it would give me an error. is there a way for me to know ahead of time whether converting something will cause an error?
View 2 Replieshow to convert a number value to its string value (ie.,1198.00 should be interpreted as Thousand Hundred and ninety eight)
View 2 RepliesI am returning one row from the database, and I want to convert the SQLDataReader to a string format, so I can pass it to my webservice.
Dim rdr As SqlDataReader = sqlcmd.ExecuteReader
If rdr.HasRows Then
rdr.Read()
[Code].....
There is a lot on the internet about converting a int to base 2 string, but I need to convert it back.
[code...]
I am trying to convert a string of binary into hex. I have tried several ways and none have worked. This is my latest try. The code runs but doesn't appear to do anything.
[Code]...
I am using the .NET Framework 2.0, and I am trying to code a client bot for a game called Minecraft, Originally written in Java, there have been quite a few people who have made custom multi-player servers for this game, Primarily in C#, or in a language that i've never heard of, such as Pascal.I'm looking right now at sending this:
Packet ID: 0x00 (0) As Byte
Protocol Version: 0x07(7) As byte
Username: "umby25" As String
[code].....
"Byte cannot be converted to 1-Dimensional array of byte"
I don't understand why this whole thing would work in all of the other programming languages, but not Visual basic.I have tried converting the string using the same method that one of the open source C# servers used, and it failed, telling me that the dictionary does not contain that or something.
I am having trouble converting a string value to a text box name.The text boxes are created at runtime and I need to get the text value out so I can store them. I keep getting the error [code]
View 5 RepliesHow can I convert a string into an array?
The values are passed as a string:
Dim strInput as string
strInput = "Tom, John, Jason, Mike"
My error message is: Value of type 'String' cannot be converted to 'System.Array'
I was trying to figure out how to convert a string (that the user would input to the program via a textbox) into actual code for the program to compile. For example, if the user was to enter: (5*100)+(20-3). How could you take that inputted string, and have the program solve it and return the value?
View 3 RepliesI have a combobox that pulls a list of values from a database. When a new entry is entered I want an entry in the combobox to read "New record". However, from what I have seen I can only insert and object, such as a DataRow, into the combobox. Is there anyway I can convert a string to to a DataRow, or some other object and insert it in to the combobox? I know there is I am just rusty on my vb.
View 3 RepliesI'm using AxVLC to try to play a video from my.resources and I can't seem to convert the binary to a string for it to work...This is what I have so far - produces no errors, or results (nothing happens).
Private
Sub
Button1_Click(ByVal
sender As
[code]....
I'm trying to convert a chosen color into hex base 6 to save to a config file for later use, and that part works, but when converting back to integer to use for a color, it gives me an error about incorrect base.
Dim hex_color = System.Drawing.ColorTranslator.ToOle(ColorDialog1.Color).ToString("X6")
Dim color_int As Integer = Convert.ToInt32(hex_color, 6)
Panel1.BackColor = System.Drawing.ColorTranslator.FromOle(color_int)
The message does not appear if a number is not entered - why?
Dim
IAL As Double
Dim inputIAL As Double
[Code].....
I was trying to convert from Double to String and everything working fine. But when I tried some bigger number with fractions in it. I got the number but rounded. I tried something like that:
Dim dd As Double = 1235212435.3453636
Dim str As String = dd
MsgBox(str)
But what I got is 1235212435.34536 instead of 1235212435.3453636
I am writing a tic-tac-toe game. The part of the code that I am having trouble with is randomly populating an "O" if the computer cannot win or block.
The code I have is;
Dim square As Integer = 6
Dim middle As Object = "grid" & square
Dim grid As Label
[Code]....
Unable to cast object of type 'System.String' to type 'System.Windows.Forms.Label'
I've got a richtextbox but want to check the keypresses before they come in the textbox. So I thought of using the KeyPress event from the form, checking that key and than writing it to the richtextbox with the Text property.But the KeyChar is a char while the Text property expects a string, and when I convert the KeyChar to a string(ToString) it gives a error.Does anyone know how to fix this or has anyone another idea for checking the presses before writing them?
View 4 RepliesHow to convert a md5 string value to number?
View 1 RepliesFirst: Ok so I'm trying to do a project in my beginning VB .Net class. We are supposed to be taking information from 5 different sections of a form and store them into an array and then call upon them later. We have Name, Address, City,State, and Zip. How would I go about saving the information into an array and then calling upon it later through File IO?
Second: I'm having a problem converting my string into a decimal. Whenever I calculate the price of the order I get 3-4 decimal places. Here is a little snippet of my code for the this:
[code]...
I have dimmed pricewithout tax as a decimal and stateselect as a string. The stateselect is based off a drop down list.
I have the following string:
20111209
How do I turn this into a DateTime Value? I've tried Convert.ToDateTime(s) normally but it keeps yelling that I'm doing things wrong because the string doesn't look like a datetime value.
I've been up for nearly 24 hours now. Trying to program an application for a game I have been playing.I've run in to a problem, I'm not sure how to solve.I have basic knowledge when it comes to VB (college class) so bare with me.[code]My only Idea would be loops to figure out where each of the edited numbers are in the array, But I was looking for something simple.Also, would it be easier to work with the bytes rather than edit them in string form?
View 4 RepliesCan someone please tell me how I would convert a string of "Thu Dec 13 10:00:06 2007" to an actual date?
View 6 Replies