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 RepliesI'm working on a quadratic formula program and when I enter 1 as A, 2 as B, and 1 as A (X should end up being -1), it returns "NaN" in both text boxes.
Here's the code:
CODE:
I have this query that returns the number of rows which is :
SELECT COUNT(*) AS MemberTotal
FROM Members
i'm trying to write a readonly property called count to return that value in string its suppose to display the result of my query in a tool strip status label, I have this in my code
Public ReadOnly Property count() As String
Get
Return memberAdapter.GetMemberCount()
End Get
End Property
but it gives me an error saying I can't convert dataset to string something like that and I don't have any idea on how to convert it I tried the Cstr but that didn't work?
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 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 wrote my first program today and it works like I want it to Except when the Message box pops up there is a zero there untell you press the OK button then the answer displayes. How do I get rid of the zero or replace it with "Answer"?the program consist of 2 buttons, a labes, and a text box, when you enter a number in the text box then press button 1 the answer displayes in the label. If you press button 2 the answer displayes in a message box.I am new to programing and this is the first program i wrote without following a tutorial or book.[code]
View 14 RepliesI've googled like crazy and tried MSDN but I can't get a clear answer what to use ToString for.
View 11 Replies[Code]....
As this Loops round, the answer for formula will eventually become the same as what was input, X. How can I get the Loop to stop when it has the same answer twice in a row? The counter will count how many times it has had to Loop before finding the repeated answer.
I'm new to the server and I'm making a quadratic calculator with my friend. I have my calculator coded, but whenever i click the calculate button the answer comes up as "NaN". Here is the code.
TextBox4.Text = (intVarB * (-1)) + (((intVarB ^ 2 - (4 * (intVarA * intVarC))) ^ 0.5) / (2 * intVarA))
The Variables "IntVarA", IntVarB, and IntVarC are defined as public variables in a code module.
i am going to create one system which is related to test skill and it is in VB.Net and access database it has a question and four answer. both are coming from database,my problem is how do i change answer sequence everytime.whenever user tried for the test, answer sequence should be different.
View 14 RepliesDim energybar As New Rectangle(9, 154, energy, 21)That is my new rectangle, now when I draw it e.Graphics.FillRectangle(Brushes.Blue, energybar)It says there is no width but the integer energy is = to 100...now, how do I fix this? It but be somewhat simple.
View 1 RepliesI have installed the fax service in windows. I want to write a code in vb.net program that start receiving from a fax call.
View 2 RepliesI have a working dropdown box that gives the answers yes & no.When "yes" is selected I need to create a message box that displays a simple message and allows the user to click ok, to get back to the survey.I have been working with it, and tried several things but no luck. What would the code look like, and where exactly would I place it to fire at the right time.I am working in VB, with an aspx & aspx.vb page.
View 3 RepliesI am writing a program for FEMAP API interface in VB 2008 Express. Some API commands open user dialog boxes which requires yes or OKcancel inputs. So much for automation "Sendkeys" do not work, because code execution stalls at the line which opens the dialog boxes. I need stg that runs in parallel, watches for these dialog boxes, and sends the right keystroke at the right time.
View 7 RepliesI have several buttons in my form and they each need to add, subtract, divide and multiply certain values together but I seem to be having problems with this. I didn't expect anything to go wrong and its probably a rookie mistake, but take my first calculation for example; a user must enter a value in a textbox (txtDays) and and also when one of my various radio buttons are pressed a value shows in a label (lblDailyHireCharge). I now need a way of multiplying these values to give me my answer shown in a label. I have done this by adding a button when which pressed multiplies the txtDays value with the lblDailyHireCharge and then shows it in the label, however it keeps on showing "0" when i click it.
Below is my code, I am basically saying that the value of both of those figures is intDuration and that lblDuration is where I want it to go when the button is clicked.
Private Sub btnDuration_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDuration.Click
Dim intdays As Integer
Dim intDailyHireCharge As Integer
Dim intDuration As Integer
[Code] .....
This might be a basic question but I am just starting in VB. How can you change the color of the text of a form if a person selects they are a boy or girl. I want the text to be blue if they select boy and pink if they select girl.
View 2 RepliesI have 3 ComboBox, I need the selection of the combobox to equal a number, (for example, the first option would = 1, second option would =4 and so on).the numbers will then be added up to show the sum.
View 2 RepliesIn our school theres a programming class and the teachers gone for the week and the sub is starting to get very frustrated, so I offered to help in any way i can. I have never programmed Visual Basic but I have programmed Ms-Dos, Javascript, HTML, *.vbs, *.ahk, *.gml, and a variety of other languages.
The class is going to build a program that calculate how many rabbits are born in a family. So when they click the button it shows in a text box the actual equation and then the answer after the equal sign that where i assume concatenation comes in.Here's the code I've thrown together for when the buttons pressed:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim RabitAmount As Integer
Dim ShowEquation As String
[code]....
I got the equation to answer it self and show in the text box but it won't show the equation?
I store a formula in the database such as the following:GrossIncome+(Overtime/0.5)-Deductions=BasicNetIncome
I am able to substitute the string representations with actually values entered, thus:1000+(150*0.5)-100=BasicNetIncome
Then I remove the '=BasicNetIncome', thus:
1000+(150*0.5)-100
How can evaluate the above equation to return a result:
[Code]...
I am just starting to learn this programming. But of this is very challenging. The question is:Explain what the code in the GuessLetter procedure you added does.Add your answer as a flowchart drawn at the end of your answer document. You can use the Word Draw tools to draw the flowchart. HINT: Your flowchart should have four decision points. Here is the code for Hang Man.
[Code]...
I Have a textBox on a form to give me my IP address (but I have 3 anwser's going into 1 textBox) When I use a button to revile The anwser's,all in one Textbox .How can I seperate Each anwser's with a space. Code Below: (TextBox5 is the TextBox I need to seperate the Answers) [code]
View 12 Replieshow I could do an if statement based on the yes or no answer of a message box...as follows
messagebox.show("do you wish to discard all information?" "Discard", MessageBoxButtons.YesNo)
if messagebox = yes then
...
else
...
end if
I have a radio button. Four in fact. All connected to a database. The Radio buttons are the answers to the questions. Button A, B,C, and D. Now in the database some of the answers are very short, one or two words, but some can very lengthy. So, my answers seem to disappear if lengthy (argh), I cannot make them shorter. How do I squeeze the answer in the Radio button? Can I add what.I do not want to change from radio button to something due to the extreme low knowledge of VB08.
View 9 RepliesI've got this code to get the decimal and groupseparator settings on a computer:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim NumFormat As New System.Globalization.NumberFormatInfo
[Code]....
The problem is that on my computer NumberDecimalSeparator should return "," and NumberGroupSeparator should return ".", but it's just the other way around when I try to get both separators from my system. What could be going wrong, and even more important, how to get the right strings? I did check my locale setting to make sure I'm not crazy and I also didn't switch the textboxes.
I'm currently creating a maths game for primary school children and have questions based on addition, subtraction, division and multiplication.I tried it out yesterday and if I type in the correct answer, I get told it's wrong, but if I type in the in the number I'm dividing by, as the answer it comes up as correct. How do I change this so that the correct answer is actually the correct answer?
View 2 RepliesI'm trying to make a quiz application with Visual Basic at the moment. I want to write a routine that asks five questions to which the answer must be either Yes or No. It must add up the number of Nos and if the number of Ns is less than two then print out "pessimist", otherwise print out "optimist". So far this is the design of what I've done. [URL]. However, I have no code which I've produced on my own.
Code:
Public Class Form1
Inherits System.Windows.Forms.Form
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
End Sub
End Class
I really don't know how I can kind of add up all the results from each individual question, seeing as radio buttons are used.
I have an application that converts one database to another and one of the functions I use is insert_Note below. This application has multipule threads all inserting diffrent data into the new database. The code below works for a number of inserts ranging between 24 and 120 but then fails with the error:There are fewer columns in the INSERT statement than values specified in the VALUES clause. The number of values in the VALUES clause must match the number of columns specified in the INSERT statement.I you look at the code you will see that this cannot be the problem as the code works for some inserts but not all. What else can cause this error in a multithread applicationuld be welcome as I have spent three days on this and got no where!
*Public sub insert_Note
Dim sql As String
Dim cmd As New SqlClient.SqlCommand
[code].....