Quadratic Formula Program: "NaN" As Result When Answer(s) Are Negative

Dec 13, 2010

I'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:

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Quadratic Calculator - Answer Comes Up As NaN

May 29, 2010

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.

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Get The Answer Of A String Formula?

Apr 27, 2011

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 ?

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Quadratic Formula "Overflow Exception"

Oct 18, 2010

I have been trying to make a program to solve for the x intercepts of a quadratic formula and have gotten this far. Whenever i debug, it says "A first chance exception of type 'System.OverflowException'" It seems to be with the code shown in bold.

[Code]...

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Calculate Formula In A String To Get Result?

Jul 15, 2011

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.

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DB/Reporting :: The Result Of Selection Formula Must Be A Boolean

Nov 5, 2008

Below is my formula for a field in my report. All fields are of value type 'Number'. When I try to save the formula it gives me error "The result of selection formula must be a boolean." Why is this? Sometimes it does not catch it as an error, but when I actually run the rwport with real data, it shows the error again. Sigh.

[Code]...

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Write A Program To Compute The Roots Of A Quadratic?

Nov 25, 2010

i cant seem to figure out where i am going wrong with this. im new to programming and havent really ran into many problems yet but this one has me baffled. i need to write a program to compute the roots of a quadratic i have my code and i am not getting any errors problem is i must check that the a value is nonzero so when i set my if block and use "if a = 0" and then display message it seems that it doesnt pass the values on to the else when a does not = 0.

[Code]...

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DataGrid Columns Math - Result Return The Answer In The Unbound Yield Column For That Row Represented As A Percentage?

Sep 20, 2010

I have a table in a data grid the columns are bound to the columns...

SQFT QTY WIDTH LENGTH

i also have added into the datagrid an unbound column called Yeild%.what i'm trying to do is the following formula

SQFT / (QTY * (width * length / 144) and have the result return the answer in the unbound yield column for that row represented as a percentage

So if SQFT = 178 QTY = 2 Width = 144 Length = 102 answer would be 0.87 (rounded)

so this would be 87%

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May 7, 2009

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?

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Mar 19, 2009

I'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.

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Sep 3, 2011

developing a program in Visual Basic 2010 to help with my study in school. I would like to develop a program whereby the user is asked to input the correct answer to a question; if the answer is correct the next question comes up if it is incorrect the user must try again until the correct answer is given. I would like to have quite a few questions (around 50).

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Making A Messenger - Program A Slight Delay In The Computer's Answer?

Jan 15, 2010

I'm working on a project where I make a automatic messenger from VBnet. I want to program a simple one that responds to certain words or phrases. However, I only know the rough basics of If...Then commands. I have a lot of problems:

1. How do I make it so the messages typed in the box actually goes up into the script box when I press send?

2. How do I program a slight delay in the computer's answer?

3. How do I set a name to the computer and to me?

4. How do I make the script goes into scrolling when it runs out of space.

5. If possible, when I type an equation in the box, can I program the computer to solve it and display the answer? I'm a beginner so I don't really know the overall organization of this project. However, I would like it to remain as simple as possible.

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Adding A Formula To A Temperature Conversion Program

Nov 14, 2010

I'm relatively new to VB, started a programing course in Uni recently What I'm looking to do is to add the following formulae into the program.

[Code]...

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Make Program To Calculate Textbox1.text And Show The Answer In Textbox2

Dec 22, 2011

I am working on bit more advanced calculator, but I cant figure out how I can make my program to calculate textbox1.text and show the answer in textbox2

For example: (textbox1) 5*62+4
(textbox2)314

I'm not sure this question belong in this topic, but I don't know where else it should be?

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Quadratic Equation - Input An A,b And C Value And It Finds The Roots

Apr 13, 2008

Public Class form1
Inherits System.Windows.Forms.Form
Private Sub cmdCalc_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles

[CODE]..........

This is my code for solving the quadratic equation..you input an a,b and c value and it finds the roots but i dont know how to graph it.

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Implementing Radio Buttons - Select One Of Them To Use One Formula, And Then Select The Other To Use Another Formula

Feb 20, 2009

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].......................

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May 6, 2011

I've made a fairly good Windows form application to solve quadratic equations, but I am having a hard time understanding the publication process microsoft uses in Visual Studio. I'd like to distribute my programm as freeware on my blog.

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Jan 5, 2011

I have a form with 10 textbox's showing my computer information and textbox5 shows a number 123456789 of bites on my hard drive how can i change this number 123456789 to gigabites i want the result to look like (100GB)

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Jul 10, 2011

The sql scripts below gives me the correct number of students queried but when I used it in VB I am getting less number of students.[code]...

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Aug 27, 2009

I have one text box where i display my current time now i want that current time record to be display in my second text box

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I have a VB.Net program that will basically make a query to a remote MS-SQL DB using TSQL, return two columns (normally 4 rows/records), 1 is a datetime and 1 is a double. I will then need to return the average of the doubles (which is easy in VB.NET).

As I will need to run this query perhaps 1000 times an hour (programmatically with different input parameters for the query), I am looking for the most efficient way to code this up so that it will take the shortest time to run. I tried SQLDataAdapter and then using dataAdapter.Fill and sometimes it returns an empty set although the raw select query has values returned.

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I have created a program and i want to save data.for example: I have created a program in this way: me.textbox1.text = me.textbox2.text * textbox3.text

and I want to know how to save the result in textbox1 then program not work (is off)

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Feb 22, 2010

I have a stopwatch in my program. I start the stopwatch with the start button I created. When I stop it it gives the results of the time in a label that I have named labelTime. I have a Calculate button I have created. I also have a label I have named calcResult. I want to click the Calculate button and divide the stopwatch result (labelTime) by 60. I want the results of this calculation to be displayed in the label calcResult. I keep getting errors saying labelTime is a string value. I believe I will need my calcResult to be a Decimal.

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End Result Of Combobox Selection Keep Showing Same Multiple End Result When There Is Only One Entry?

Dec 10, 2010

I am currently having a headache on how to solve this problem that i am facing. here is the situation: I have a combobox and a list box on the main form. The combobox will get the data from the ms access database. In the database, i have the details of a person's IC, Name and DOB say for eg on one entry I have D215311523C,SHAWN,13/04/1987 So now, my combobox on form load will show the list of dates in the database to allow the user to search base on the date itself by clicking on the selected date. So when the user clicks on the particular date say 13/04/1987, people in the database whose birthday is 13/04/1987 will be shown on the listbox.Meaning to say if i have 3 entries whose dates are the same 13/04/1987, 3 entries will appear. If there is only two entry, then two results will be shown. But now, when i do a single click on the date, one result will be shown. That is correct. But the problem is when i click on the same date again, three of the same results will be shown on the list box. that is it will display : 13/04/1987 13/04/1987 13/04/1987 which is not the case. Then it will show more duplicates of the same results if i click more times on the same date which should not be the case.

Dim n As Integer
Dim numbers() As Integer
Dim StartFrom As Integer
Dim EndAt As Integer

[code].....

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I am using a datagrid in my where i am having four columns. In first column the parameter values are entered and in the second column measured value is entered and in third column the nominal value is entered.Inthe fourth column the result is displayed by subtracting the measured value and nominal values. I am doing this calculation in Datagrid cell validated event. What i want is,there will be many rows in the grid,when typing the value in the third column the corresponding result will be displayedin the rowof theresult column,save button will be displayed while the form loads,when the calculate part is completed that is there should not any cell of the resut column empty then i should enable the save butto.

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Dim HCI_Command_Rcvd_Byte() As Byte All good till here What i wanna do is make an array and put this result every time the serial port gives me a new result, for example:

[Code]...

Basically what i wanna do is let the port parse the messages, fill in the array with the result at an empty spot in this array and then i will have a separate thread that will look in into this array in each non empty space and after it looks into the non empty space it will use or discard the info and also mark this space as empty (after it checked)

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I'm creating a small program to read from an SQL server, loading result into an array, pivoting the array to my liking and mailing it out to selected members of a group. It's going to be run once a day with Windows schedule. I have the connection, query and mail sorted, but not the datareader to array bit.

(line 26)?
Imports System.Data
Imports System.Data.SqlClient
Imports System.Net.Mail

[CODE]...

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For example:
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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]

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