I am currently using Decimal, thus far I have not checked thoroughly if it will have any inaccuracies so I wish to know from your experiences what is the best variable type for calculations, it would mainly be for areas.
View 10 RepliesDoing a calculation, variable is stored as an integer.It got too 2,147,483,647 before giving me an arithmetic overflow. Anyway i can increase the number it can hold?
View 7 RepliesI need to store a calculation to use later and obtain a new calculation
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why this code the number i add not expected what i want?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim com As New OleDbCommand
Dim d As Integer
Dim qty1 As Integer
[code]....
I want to build a metronome,which sounds a beep in a specified time interval.The beep has to sound exactly the right time, after all, is a metronome.I need a timer that runs events(tick event)accurately.The timer control is not for this.
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I set the value in VBT as 1.205, but if i print that value in Immediate window it get changed to 1.20492553710938. I need to display the value, whatever i have set.
what is the problem here and the solution to get the value whatever i have set?
Every sample code I've ever found for drawing rounded rectangles using GDI+ goes something like this (lifted and slightly modified from BobPowell.net):
Private Sub Panel1_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles Panel1.Paint
e.Graphics.Clear(SystemColors.Window)
e.Graphics.SmoothingMode = SmoothingMode.None
[code]....
This produces a rounded rectangle where only the top left corner is accurate.AntiAliasing has to be turned off because it is going through a remote desktop connection, and I can't depend on it being available. Besides, I am looking for a crisp rounded rectangle.I've tried resizing the other corners and changing the pen alignments, but nothing seems to produce a simple, accurate rounded rectangle.Is there a way to draw a better rounded rectangle than this in good old winforms?
Whats with this??the result of:CDbl(csng(35.8))is:35.799999237060547
View 2 Replieslook at this class and say why it's just returning just the first row in the second query, the issue is that the Salary is showing the right value when debugging, but when deployed to IIS it's just returning the 1st row
Imports System
Imports System.Collections
Imports System.ComponentModel
[Code].....
I'm using the code below to send large strings (500kB) to a server. I'd like to show the upload speed and in order to do that, I need to calculate the amount uploaded every second.
In a Timer that fires every second I get the BytesUploaded, divide it by 1024 in order to get KiloBytes (kB/s) and show it to the user. Then I set BytesUploaded to 0 and one second later do the same process.
The uploading is done asynchronously and the size of the data is added to BytesUploaded at once. This means that BytesUploaded is not being updated in a constant flow and has a totally different value almost every second.
0
512000
0
0
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I'm creating a program (SURPRISE!), one of the features it has is a tutorial helping with learning a language which has a lot to do with the program's topic. So, I want the program to be capable of getting what the user inputs using his microphone (as a respond to a question the program asks), then analyze it and compare it to a prerecorded answer, then tell him how well he did. How to do that?
If this can't be done using VB.Net, which wouldn't be much of a surprise, then what programming language or whatever do you recommend for me to create an external .exe file which takes in the input, analyzes it, and returns the result to my program? (Isn't this the longest sentence in the English language!)Yeah, and, how can I control how accurate the program is while comparing them?
I have been trying to create a timer program with VB 2010 to the accuraccy of 0.05seconds (If possible, 0.01s)I insert a timer into the form (Timer1, Interval - 50).[code]But when I run the timer for 1min, the recorded time was 48.05 sec.How can I make my timer more accurate? Is there anything i have done wrongly with the code?
View 2 Replieswhen i type the number in textbox3, why the number update to database not accurate ?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim com As New OleDbCommand
Dim qty As Integer
Dim d As Integer = 0
[code]....
I am currently creating a program to send keystokes to a program at certain intervals. I need the thread to delay between keystrokes, and i need to be able to have the user input the amount of delay from the GUI via textbox. I have it running perfect with Thread.Sleep(), but it just isn't consistent enough. How can I code it to be accurate to roughly 5ms up or down? thanks, and here is the code. This is in VB 2010 by the way.
View 2 Repliesis it possible to draw an accurate circle in vb.net with mouseDown and mouseUp boundaries? I only manage to create circle-settings with rectangular boundaries using DrawEllipse. I've tried to work around it using pythagoras but it just doesn't work and I'm pretty sure I've got my maths right...
Is it possible to define a circle with DrawEllipse(pencil,x1,y1,width,length) ?
I need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16
Interval=10, Count=1000, Run time = 16 sec, msec per interval=15
Interval=100, Count=100, Run time = 11 sec, msec per interval=110
Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
I 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.
I receive the error -
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I am running into trouble with some code I am doing for an assignment. The section within the apostrophes (If Then Else) is the section that I am having trouble with. When the user selects a seat type and then clicks the compute button, the wrong cost is displayed instead of an accurate cost.
Option Strict On
Public Class frmTickets
Private Sub btnComputeCost_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnComputeCost.Click
Dim intNumberOfTickets As Integer
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Heres my code in vb 2008[code]...
I need to add 15% vat to it and i have no clue how to add the 15% vat.
compute an exact age of a person using the format date of mm/dd/yy... in vb.net, i was trying to code it but the result was not the exact age of the person.lp me...
View 11 RepliesI am using Microsoft Visual Studio 2008 with VB.NET, and in class we were assigned this project: A procedure should calculate a 2% price increase on all red shirts, but a 1% price increase on all other items. In addition to calculating the price increase, the procedure also should calculate the new price. You can use the variables strItemColr, strItem, decOrigPrice, decIncrease, and decNewPrice. Format the original price, price increase, and new price in the lblOriginal, lblIncrease, and lblNewPrice controls, respectively.
View 1 RepliesI have datagridview, wich have 5 columns
example:
id supplier bought payed sum
1 a 15
2
2 a 20
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i have an issue with my program. when i create a function and use a calculation in it it returns a wrong answer. if i copy the calculation and put it directly in the btnClick event it works ok. is this normal?
here is the code if you would like to try see what i am doing wrong.
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
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I'm having trouble with a calculation in VB and it's a simple one but for some reason I keep getting an output of zero.
Here's the code for the calculation and the click button:
CODE:
i have this problem on how to calculate the amount due in our system in VISUAL BASIC.NET .in returning module, (this is for penalty purposes), if the borrower didn't return the book on time, the system must automatically generate the amount due .one daY is equivalent to 10(ten) pesos.so if the borrower didn't return the book with 2 days. the amount due must be 20.00 pesos.
View 6 RepliesI have two money fields in a SQL database called TotalClaimed and PartialSettlementAmountRecd.They are declared as Decimals like so:
Public PartialSettlementAmountRecd As Decimal
Public TotalClaimed As Decimal
They both output the repsective amounts perfectly. I need to do a calculation on them, by subtracting PartialSettlementAmountRecd from TotalClaimed. I have tried the following, but it just outputs a random number, not the amount I require.
Dim NewSettAmount As Decimal = (ClaimDetail.TotalClaimed) - (ClaimDetail.PartialSettlementAmountRecd)
Response.Write("New Settlement Amount: £" & NewSettAmount)
I found this thread in regards to calculating CRC16 on an array.... however, it does not work probably because it was written for VB6 and not .NET. [URL] Does anyone know of a built-in function in .NET to calculate CRC16? If not, is there a way I can adapt the above VB code example to work with Visual Studio 2010?
View 12 Replieswhat i am trying to do is i have two textboxs which have figues in them and need the 3rd textbox to display the figure the code i am using doesnt seem to be doing anything could anyone spot it and tell me why it is not working for me
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i am trying to do is i have two textboxs which have figues in them and need the 3rd textbox to display the figure the code.[code]I want the answer doesnt display in the textbox as i want it but when i click on the text box nd type anything the answer shows but in the error
View 6 Replies