Computation Error Variable Double
Jul 2, 2011im having a simple computation problem here....
[Code]....
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C++ - What Is A Variable With & -> Double&
Sep 12, 2011So I have a class made in c++ and need to convert it into vb.net but I got problem converting a certain part of a function. [Code] What type of variable is "double&", I know a double but what's with the "&"? It isn't " double &dec_deg" so it isn't an address (pointers etc.)? and how would i convert that to vb.net?
View 5 RepliesClear A Variable Set To Double?
Sep 12, 2009When the clear button is clicked on my interface I need my variables that are set as doubles to clear...I tried setting them to zero but that messed up my equations and caused more problems. Is there some method in double that clears them out or sets it back to nothing.here's the coding
'button i need to clear my textboxs and variables
Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click
[code]....
VS 2008 Error: Range Variable 'sender' Hides A Variable In An Enclosing Block Or A Range Variable Previously Defined In The Query Expression
Mar 25, 2010I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient
Imports System.Linq
Public Class Form1
[code]....
I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
Dividing Integers With Double Variable
Apr 4, 2012I've came across to quite an unusual problem with dividing integers with double variable. I've created For loop where to sum-integer interval -double is added. When sum reaches certain number text is displayed as showed below:
[Code]...
Double A Number For Every Time A Variable Is Used?
Sep 18, 2011If i have a variable '12'
and a variable 'hello'
how can i double the '12' each time the variable is used?
What im trying to do is have a textbox which the user writes in a number, the number they enter then determines the amount of times a variable is written in a textbox.
so if the user were to put '3' into the textbox and click go, it would print hello12hello12hello12, how can i increase the number 12?
what i want it to do is look like this when the user presses go: hello12hello24hello36
How To Maintain Variable Value In Double DataType
Jun 22, 2012Datatable contain some values like 0.0,10000.00,54678.94. I am getting that values using for loop and store it in a variable in double datatype. I want to add these nos and store it in a variable. Each time variable value changed.
for loop
Dim ds5 As dataset1.pro_dtsumDataTable = TA5.GetData(TextBox1.Text, users)
If (ds5.Rows.Count > 0) Then
Dim y As Double
y = Double.Parse(ds5(0)("sum(fld_primary)").ToString())
Dim y1 As Double
y1 = 0 + y
End If
Next
First time y1=0.0
Next time the value of y1 is not added to previous value.
I want the result y1=64679.34
How To Plot A Double Variable Function
Mar 14, 2012I'm currently working on an assignment for university and I could really use a hand.I need to plot the equation y=0.2*sqrt(1-(0.25/x)^2)
View 5 RepliesLimitation The Length Of Double Variable?
Mar 22, 2009I need to truncate to sertain amount of decimals for example : dim x as double;x= 6.98455 textbox1.text = x that mean textbox1.text= 6.98455 I need textbox1.text= 6.99
View 4 RepliesHow To Check If Variable Is String Or Double Type
Jun 16, 2009I want to see if a variable's type is string or double type. How to do it in vb.net immediate window?
View 1 RepliesHow To Take 3 Or 4 Decimal Points Of A Double Variable Without Round Off
Apr 18, 2012I have a double value like 3768.595863. if i round this value then i will get 3768.596 but i want 3768.595.how can i get that?please reply.
View 7 RepliesMake A Variable That Holds Double Qoutes
Feb 10, 2011How do I define a variable which holds double quotes. when I try to define the variable like this [code]...
View 2 RepliesPreserving NULL Values In A Double Variable?
Apr 15, 2010I'm working on a vb.net application which imports from an Excel spreadsheet.
If rdr.HasRows Then
Do While rdr.Read()
If rdr.GetValue(0).Equals(System.DBNull.Value) Then
[Code]....
But when passing the value to the SQL insert I get: "Nullable object must have a value."
Solution:
Fixed by changing the datatype of the parameter in the sub I was calling and then using Variable.HasValue to do the conditional DBNull insert.
Put Data Containing Double-quotes In String Variable?
Oct 14, 2011How to put data containing double-quotes in string variable? Aug 01, 2003 02:30 AM | LINK I need to store a string that contains words in double quotes. The complete string data is presented to the variable in double quotes, but the next double quotes within the data ends the string and the remaining text gives a syntax error. How can I place literal double-quotes in a string variable? For example:
[Code]...
Double If Statement - Getting Error "Conversion From String "frog1" To Type 'Double' Is Not Valid."?
Apr 12, 2011I've been just making random programs trying to get the hang of the new language this time I was making a leap frog game where it switches back and forth beetween frogs every time a button is pressed. It also checks if the frog can land in the text box above the button pressed, if there is another frog there a message box will pop up saying sorry space is filled other wise the frog should land there.
[code]...
The error message says "Conversion from string "frog1" to type 'Double' is not valid." I understand what a double is but I've tried And If and that causes a bunch of errors.My Question is whats wrong with this cod and how can I make a double if statement???PS I did try to make an array to shorten this but thats in a different fourm will post URL later
Access Single Bytes That Form A Double Variable?
Sep 20, 2009How can I get access in a fast way to the single bytes that form a double variable?
In pseudo-code I want to do something like this:
Dim myDouble as Double
Dim myArray(7) as Byte
myArray = myDouble
'continue doing things with the single bytes
The code is meant for use in a I/O-handler. The double-variables have to be sent / received via TCP. For this purpose they shall be put into / assembled from I/O-buffers.
Variable Error "Variable 'reader' Hides A Variable In An Enclosing Block"
Aug 23, 2011I receive the error -
[Code]...
Age Computation Using Datetimepicker?
Jun 21, 2010How can I get the value of the year, month and/or day from the DateTimePicker if I'm trying to compute for the age? I've tried
Dim x As String = ""
x = Date.FromOADate(Val(DateTimePicker1.ToString))
MsgBox(x)
But it only gave me 12:00 AM.
and
DateDiff(DateInterval.Year, DateTimePicker1, Now.Date)
This time it said datetimepicker1 cannot be converted to date.
Store Values To A Double-type Variable, And Ask To Display It On The Screen, There Seems To Always Be A Discrepancy?
Mar 16, 2010Whenever I store values to a double-type variable, and ask to display it on the screen, there seems to always be a discrepancy, for example, I entered 7.416 to a textbox and assigned it to a double. When i ask for it to be displayed, it used to be that the 7.416 is returned to me. But just a few days ago, when I debugged my program again, it returns numbers like 7.4159987.......[code]....
View 7 RepliesComputation Of Tax For Payroll System
Oct 6, 2011I am working on program in vb2008 and facing problem in making a PAYROLL SYSTEM.. well, I've done some of its parts and functions but the main part of it is still unsolved -- the computation of tax!! our boss want that when you input a basic monthly salary, the semisalary will be computed.. minus the sss, pag-ibig and philhealth.. then the tax will be computed but also depending on the number of dependents the employee have...
Code:
Private Sub semiSalary_click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles semiSalary.Click
If basicSalary.Text = "" Then
MsgBox("Please enter a salary.", MsgBoxStyle.Exclamation, "Invalid")
Else
Dim result2 As Double
[Code] .....
What I've done is that I'm trying to display those values when the the textbox corresponding to it was clicked. We get each value in our database stored on textboxes from the formtables of sss & philhealth.
Attached image(s)
Display Computation Process On VB?
Jan 28, 2009How to display computation process on VB 2008 form?
View 3 RepliesFuction In Sql - Have A Computation On The Table?
Aug 28, 2009[code]...
i would like to have a computation on the table (in sql) im creating en example computation:
Dim FiKg As Integer = ((txtFeNum.Text * txtFiFe.Text + txtMaNum.Text * txtFiMa.Text) * 7 / 1000)
Dim FemaleNum As String = txtFeNum.Text
Dim MaleNum As String = txtMaNum.Text
[code]...
Insert Command With Computation
Jun 22, 2010i'm still developing my project bout evaluation of employees. I'm using the code below,I want to multiply the values of the two specific row/column inside my datatable and then insert the product in the KPIGRDEQUI field in the KWEEKDTL table.Is it possible to be done?
[Code]...
Inserting Computation In Sql Table Using .net?
Aug 29, 2009for example i have this table
x ! y ! z ! Result !
54 ! 12 ! 5 ! !
54 came from --> Textbox1.Text
12 came from --> Textbox2.Text
5 came from --> Textbox3.Text
and i will display the result at row rowResult
[Code]...
VS 2010 Book Penalty Computation?
Mar 23, 2012I have a 2 DateTimePicker on my design.1 DateTimePicker for Due Date and another 1 DateTimePicker for Date Returned. Now I would like to automatically compute for penalty which is 24 per day just clicking on the Date Returned's DateTimePicker.For example,A student borrowed a book today and the librarian assigned the due date when to return it.
Take note, the date today is 03/23/2012.and the librarian assigned a due date into 03/25/2012 (the exact date when the student should return it).When the student attempts to return the book at 03/28/2012, and the librarian clicks on the Date Returned's DateTimePicker, the penalty will show as 72 and so on and so for.So I am asking on the codes or tips on how should i do it to make this things work?
Communications :: Object Variable Or With Block Variable Not Set Error
Jul 24, 2008Been getting this error with my program. Using framework 2.0
[Code]...
DB/Reporting :: Object Variable Or Withblock Variable Not Set Error
Jan 21, 2010I'm trying to enter automatically todays date in a number of records in the Table 'Applications' into the field 'Date_refund_request'.
However it is giving me the error 'object variable or withblock variable not set' in the line "Set rs = db.OpenRecordset(strSQL, dbOpenDynaset)".
The code is as follows:
Private Sub Command16_Click()
On Error GoTo Err_Command16_Click
Dim db As DAO.Database
[Code].....
Asp.net - Object Variable Or With Block Variable Not Set Error?
Dec 8, 2011I'm writing in ASP.NET 4 / VB.NET. I am querying an MSSQL database and sometimes have records come back with no results...so I enclosed the call I was making upon the results in an If..Else clause to set a default value if the database comes back with no results...but now I am getting this "Object variable or With block variable not set error". Here is the relevant code:
Dim clcfirst
Dim rhcfirst
Dim clcdate As Date
Code].....
Object Variable Or With Block Variable Not Set Error
Aug 21, 2010I am populating combo box from database. In debug i can see that the combo box has been populated . here is the code
[Code]...
Loop Computation Time Increases Dramatically With Small Change
Apr 3, 2012I recently made a change to the code within a loop in my code, and now when I run the code through Visual Studio 2010 Express, the loop runs about 10x slower than the previous loop.I did not make any significant changes (to my knowledge) to the code within the loop.I made the change so that the loop could handle various conditions I imposed in another section of the code.I know that it is this loop that is slowing everything down because I report the loop progress on my form.[code]I feel like my changed code should run better, but it doesn't.I know that my code is not written very efficiently (and feel free to comment on ways to improve it), but my main concern is the significant increase in computation time that resulted from my changes.The loop above is the main block of code within the Sub, which is run via a thread.In my tests, it is the only thread running at that time.Everything works, and the computation yields the correct result, but takes 10x longer than previously. Additionally, the number of iterations does not increase.So the new code isn't iterating excessively, it is simply taking much longer to compute within each iteration.
View 19 Replies