Multiplying The String Representation Of REAL Numbers?
Jan 12, 2012
<edit> Now showing the difference as a DECIMAL. Result looks like zero every time. </edit>Disclaimer: This code is provided "as-is" and should be treated as Freeware.( However any donations would be welcome as I have a "so-so" part-time job ).Please note all real numbers to be used should be in this format
"0.000000000000"Do not use numbers in string format in scientific notation like "1.2345E -06"I was feeling bored and decided to add to the code from JohnWein in this thread where I have used a routine that will multiply the contents of two long strings together.>>[url]I have now added a bit of code so you can multiply two really long numbers with or without a decimal point as a full-stop ( period or dot, call it what you like ).
[code]...
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Sep 14, 2009
I have a string I want to parse. I could write the code to do so, but I figured that VS.NET has a parser that should do this for me.however, I can't find it. All the searches I do return info on how to parse numeric values in string form into real numbers. It would be nice if the MSDN search had some ways to allow users to enter more details than just search text and 3 ways to filter out irrelevant stuff. In any case, I also tried things like string.parse (nope - although I kinda figured this would be it.) I also looked at Enum.parse, but the code indicates that it works with arrasy of items, not strings.
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Jul 2, 2010
Then you have to take that same range and find the product of all odd numbers between said sequence. I figured out how to find the product but only if the lowest number is also an odd number. For example, if I put in the values 1 and 7 the product is 105 which is correct. But if I put in 2 and 5 the product somehow becomes 10, when it should be 15.I have to use the MOD function to distinguish between even and odd numbers, which I know how to do however it's still not working out correctly for some reason and I'm completely stuck. This is the part I'm having trouble with. Go down for full source)
For counter = intX To intB
intX = intProduct
If intY Mod 2 = 0 Then
[code].....
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Feb 15, 2010
I am trying to convert a string to a single. Ive tried csng() directcast() and single.parse. The first two methods crash. Single.parse says input string was in incorrect format. The number is 777.7932 so should convert fine. Ive tried it this way:
'x = single.parse(pts(0), globalization.NumberStyles.AllowDecimalPoint)
how can i convert a string representation of a single data type that is read from a text file into its single data type. I checked control panel and globalization settings are set to english.
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Jun 3, 2011
I want to make a hashtable of object references and I want a different object's reference to be the key. How can I do this in vb.net? In java (assuming I am using the default toString method and that add() takes a string as a key and an object ref as the value) this would be something like: hashtable.add(obj1.toString(), obj2)
I do not want to use a vb.net gethashcode() function because I want deep clones of objects to have different identifiers. A related question is what is the default toString in vb.net? How can I get a string that represents an object reference in vb.net?
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Jun 30, 2009
I need to generate 'real' random numbers from 0 to 500 (e.g. 247.214, 477.125, 1.247, 54.078, 147.001 ......etc). I am using this method:
Dim Myrand As New Random
Dim Res As Double
For i = 1 To 10
Res = Math.Round(Myrand.NextDouble, 3)
Next
This method gives numbers between 0 and 1. if I use: Res = Myrand.Next(0,500), then this gives Integer numbers.
The questions is: Is this possible with (Dim Myrand As New Random) or I have to try another way (e.g. Rnd() ) for doing this?
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Jan 23, 2012
I am trying to log the contents of an object to a text file. If I do a debug.print of the object itself in the immediate window, it prints all of the values of the object's properties:
?mDb.DatabaseOptions
{Microsoft.SqlServer.Management.Smo.DatabaseOptions}
AnsiNullDefault: False
...
UserData: Nothing
However, I can't seem to access this as a string in code due to a type mismatch. I assumed I could get this information using the .ToString method, but all that returns is the object description with none of the properties or values:
?mDb.DatabaseOptions.ToString
"Microsoft.SqlServer.Management.Smo.DatabaseOptions"
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Jan 14, 2011
I 've an ArrayList and to join all its elements with a separator in one string I m using...
Dim s As String = String.Join(",", TryCast(myArrayList.ToArray(GetType(String)), String()))
however, I would know if there is a smarter/shorter method to get the same result,or same code that looks better...
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Aug 7, 2009
I want to retrieve an object by using a string representation of the objects name. For example lets say i want to change the font of 3 labels on a form programatically. Instead of changing the font property for each individual label like so:
Label1.Font = FontDialog1.Font
Label2.Font = FontDialog1.Font
Label3.Font = FontDialog1.Font
I want iterate through the labels in a For..next loop like so:
[Code]..
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Apr 26, 2010
I've already wrote a simple program for connecting to a serial port that can send data to the microcontroller, do some basic arithmatic and transmit it back to my Form. This was just to see if I could set up the conection.I have a PIC Microcontroller giving an 8-bit number thats is taken from an external sensor device.What I want to do now is to present this data from the microcontroller in a textbox as a number either in real time (as the sensor output changes) or if not possible, on request (using a button).
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Mar 11, 2010
I worked around to modifying regular expression below but i could't get what I need. I google it, many things found but not for what i want. Dim valid AS Boolean = Regex.IsMatch(TextBox1.Text, "^(,?d+){0,20}$")Allow numbers exactly like 32,1,6,32,12,21,21,54,675,8,4,3,2,9,0,21,21,21,43,744 in TextBox1. Perfect.
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Mar 17, 2010
So I'm building an application that is going to do a ton of code generation with both C# and VB output (depending on project settings). I've got a CodeTemplateEngine, with two derived classes VBTemplateEngine and CSharpTemplateEngine. This question regards creating the property signatures based on columns in a database table. Using the IDataReader's GetSchemaTable method I gather the CLR type of the column, such as "System.Int32", and whether it IsNullable. However, I'd like to keep the code simple, and instead of having a property that looks like:
[Code]...
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Jun 24, 2010
Searched High & Low to find a reliable way to get HDD real serial numbers in VB.NET. WMI method using Win32_PhysicalMedia, does not work reliably (I am administrator & using XP Pro & SATA drives)
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Jan 4, 2010
I need to document binary files containing integer and real numbers. I use BinaryReader, and BinaryWriter classes, with functions like ReadInt16, ReadSingle, or ReadByte. The files should be readable by any other hardware architecture/OS besides x86/Windows.
I need to document the type of default binary encoding, and can't find the MS documentation.The best I found says that it uses UTF8, but as I understand, UTF8 is for text formats, not for binary numbers.
I suposse that the answer I are looking for, is something like "little endian" or "big endian" format.
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Oct 14, 2011
I have two databases, one on my local work computer and other on a server. Both have been created with Microsoft SQL Server 2008. I can access both of them with connection strings that contains names of the servers and some other information. However the names contain only the ip-number of the server. And I need the full name of the server and the instance created, separated with "" character. I can see them in my SQL management studio but I need to get them from VB-code.I created SqlConnection-class but it finds only the ip-addressed name. SqlSourceDataEnumerator won't do good because it finds all unnecessary server names that I don't need. How can I find the real name of the server that is specified in the connection string?
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Apr 2, 2012
I need to generate all combinations (not permutations) in VB .NET, I've been search and all I found is for permutations (some says combinations but when I was try it, all are permutations).
What I need is to generate combinations from string array:
Dim data_array As String() = {"one", "two", "three", "four", "five", "six"}
I need that: If I say just 1 length, it must returns:
one
two
three
four
five
six
If I say 2 length, it must returns:
oneone
onetwo
onethree
onefour
... etc ...
twoone
twotwo
twothree
... etc ...
And continues til end with all combinations. If I say more length do it as well.
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Jun 12, 2011
The string itself contains things like "random" & random.next(1,3) & "random2" etc. The string registers all of this as a string and doesn't actually calculate random numbers.Is there any way to fix this?
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Dec 18, 2010
in my project i am using this code to multiply to textboxes value
(
Dim tot As Integer
[code].....
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Dec 2, 2009
how would i go by multiplying two variables..
ListBox1.SelectedItem.ToString() * Label1.Text.ToString() = Label2.Text
is what i have but it seems to not want to do it... [URL]
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Apr 9, 2011
I'm new to vb and I am currently trying to code a Program for counting cash from a till. I know how to multiply and add if I were to use a button to execute it but what I want is for the totals to be automatically populated as soon as the user inputs the data.
Example:User inputs 23 into the txt1cent textbox
So the program should multiply 23 by 0.01 and output the answer (0.23) into txtsum1cent textbox.
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Apr 10, 2009
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].....
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Jul 15, 2009
(All of this is in a datagridview) i would like to know if it would be possible to say, take Columns 1 and Column 2 and multiply the value of each row and post it to a Column 3 with each row in Column 3 reflecting the multiplied values of the previous 2 columns..
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Sep 6, 2011
I've got an array of type double with about 30 entries(numbers) in it.I need to multiply them all together. Sort of like "=product(A1:A30)" in Excel (formula).
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Jan 7, 2011
I have two list boxes created. One is Quantity and other is Price. When i enter price and quantity i want it to multiply and add one by one and give me the total in a label below...The problem is when I have two or more items in each list box I'm unable to come up with the total. I figured out that it will need a loop. So my question is that how should i use the loop. I haven't learn't how to make loops..
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Oct 7, 2009
I have two list boxes created. They are populated when I enter the quantity and the price (one list box for each). This data actually comes from another set of text boxes. The problem is when I have two or more items in each list box I'm unable to come up with the total. I need to take the quantity * price for each entry and then add that to the quantity * price for the other entries. When I press my "total" button it's only doing the calculation for the first line.
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Sep 18, 2010
How can i possibly multiply two values in datagrid when a text change happens. Here is my layout:
Here is the code I used but its giving me an error:
Private Sub dgvSalesEntry_CellValueChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvSalesEntry.CellValueChanged
Dim ind = dgvSalesEntry.CurrentRow.Index
[code]....
Error Message: An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.But when I deleted the codes above I can run my system.
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Nov 6, 2009
is there an object representation of System that i can Extend upon such that the extended method becomes global.
<Runtime.CompilerServices.Extension()> Public sub globalprocedure(ByVal asystem As ?)
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Jun 27, 2012
[URL]notice that the tag topic count for C# is in excess of 8900 while the vb.net tag topic count is sitting at 1019. Does this mean that there is a shift towards c# as a .net language of choice. the only reason I decided to build some applications for work using c# was that I like curly braces - after all vb has the same language support as c#, doesn't it so there should be no advantage to choosing one over the other; other than curly braces;)
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Apr 16, 2010
Is it guaranteed that the numeric values for an Enum with only uninitialized values start at zero and increment by one in the order defined?
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Aug 15, 2009
I am totally new to the graphical representation of the data. I want to make a progress report of students, based on marks achieved each year.For example, in year 2005 marks were 750. in 2006 780 in 2007 800
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