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• Precision problems of real numbers in Fortran

  - by saladoil

  I've been trying to use Fortran for my research project, with the GNU Fortran compiler (gfortran), latest version, but I've been encountering some problems in the way it processes real numbers. If you have for example the code: program test implicit none real :: y = 23.234, z z = y * 100000 write(*,*) y, z end program You'll get as output: 23.23999 2323400.0. I find this really strange. Can someone tell me what's exactly happening here? Looking at z I can see that y does retain its precision, so for calculations that shouldn't be a problem I suppose. But why is the output of y not exactly the same as the value that I've specified, and what can I do to make it exactly the same?

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• Match two mysql cols on alpha chars (ignoring numbers in same field)

  - by Steve

  I was wondering if you know of a way I could filter a mysql query to only show the ‘alpha’ characters from a specific field So something like SELECT col1, col2, **alpha_chars_only(col3)** FROM table I am not looking to update only select. I have been looking at some regex but without much luck most of what turned up was searching for fields that only contain ‘alpha’ chars. In a much watered down context... I have col1 which contains abc and col two contains abc123 and I want to match them on alpha chars only. There can be any number of letters or numbers. Any help very much wel come

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• Find all numbers that appear in each of a set of lists

  - by Ankur

  I have several ArrayLists of Integer objects, stored in a HashMap. I want to get a list (ArrayList) of all the numbers (Integer objects) that appear in each list. My thinking so far is: Iterate through each ArrayList and put all the values into a HashSet This will give us a "listing" of all the values in the lists, but only once Iterate through the HashSet 2.1 With each iteration perform ArrayList.contains() 2.2 If none of the ArrayLists return false for the operation add the number to a "master list" which contains all the final values. If you can come up with something faster or more efficient, funny thing is as I wrote this I came up with a reasonably good solution. But I'll still post it just in case it is useful for someone else. But of course if you have a better way please do let me know.

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• R: Given a set of random numbers drawn from a continuous univariate distribution, find the distribut

  - by knorv

  Given a set of real numbers drawn from a unknown continuous univariate distribution (let's say is is one of beta, Cauchy, chi-square, exponential, F, gamma, Laplace, log-normal, normal, Pareto, Student's t, uniform and Weibull).. x <- c(15.771062,14.741310,9.081269,11.276436,11.534672,17.980860,13.550017,13.853336,11.262280,11.049087,14.752701,4.481159,11.680758,11.451909,10.001488,11.106817,7.999088,10.591574,8.141551,12.401899,11.215275,13.358770,8.388508,11.875838,3.137448,8.675275,17.381322,12.362328,10.987731,7.600881,14.360674,5.443649,16.024247,11.247233,9.549301,9.709091,13.642511,10.892652,11.760685,11.717966,11.373979,10.543105,10.230631,9.918293,10.565087,8.891209,10.021141,9.152660,10.384917,8.739189,5.554605,8.575793,12.016232,10.862214,4.938752,14.046626,5.279255,11.907347,8.621476,7.933702,10.799049,8.567466,9.914821,7.483575,11.098477,8.033768,10.954300,8.031797,14.288100,9.813787,5.883826,7.829455,9.462013,9.176897,10.153627,4.922607,6.818439,9.480758,8.166601,12.017158,13.279630,14.464876,13.319124,12.331335,3.194438,9.866487,11.337083,8.958164,8.241395,4.289313,5.508243,4.737891,7.577698,9.626720,16.558392,10.309173,11.740863,8.761573,7.099866,10.032640) .. is there some easy way in R to programmatically and automatically find the most likely distribution and the estimated distribution parameters?

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• Help using preg_match for phone numbers

  - by Kirk

  how would i write an if statement that would find phone numbers and store them to a variable. Here is what i have so far but its not working. if (preg_match('/^(?:(?:\+?1\s*(?:[.-]\s*)?)?(?:\(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\s*\)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(?:[.-]\s*)?)?([2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\s*(?:[.-]\s*)?([0-9]{4})(?:\s*(?:#|x\.?|ext\.?|extension)\s*(\d+))?$ /', $buffer, $matches)) { $phonenumber = html_entity_decode($matches[1]); }

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• How can I create an enum using numbers?

  - by Jordan S

  Is it possible to make an enum using just numbers in C#? In my program I have a variable, Gain, that can only be set to 1, 2, 4, and 8. I am using a propertygrid control to display and set this value. If I were to create an enum like this... private enum GainValues {One, Two, Four, Eight} and I made my gain variable of type GainValues then the drop-down list in the propertygrid would only show the available values for the gain variable. The problem is I want the gain values to read numerically an not as words. But I can not create an enum like this: private enum GainValues {1,2,4,8} So is there another way of doing this? Perhaps creating a custom type?

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• haskell. words into binary numbers

  - by Katja

  I need to convert words into binary numbers. With a bit help of yours I got this blCo::String -> Integer blCo x = num2bin(lett2num x) blCo (x:xs) | x:xs = num2bin(lett2num x):blCo xs num2lett :: Int -> Char num2lett n | (n <= ord 'A') && (n <= ord 'Z') = chr(ord 'A'+ n - 1) | (n <= ord 'a') && (n <= ord 'Z') = chr(ord 'A'+ n - 1) num2bin :: Integer -> String num2bin n | n >= 0 = concatMap show (reverse ( n2b n)) | otherwise = error "num2bin: negative number" where n2b 0 = [] n2b n = n `mod` 2 : n2b (n `div` 2) he tells me a mistake.I dont undertsand it mistake: Couldn't match expected type `Char' against inferred type `String' In the first argument of `lett2num', namely `x' In the first argument of `num2bin', namely `(lett2num x)' In the expression: num2bin (lett2num x)

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• comparison between point and integer

  - by LawVS

  Right, basically I want to add two numbers together. It's for a working hours calculator and I've included parameters for a night shift scenario as an if statement. However, it now mucks up the day shift pattern. So I want to sort out that if the start time is below 12, then it'll revert to the original equation shown in the code instead of the if statement. -(IBAction)done:(id)sender { int result = [finishHours.text intValue] - [startHours.text intValue]; totalHours.text = [NSString stringWithFormat:@"%d", result]; if (result < 0) { totalHours.text = [NSString stringWithFormat:@"%d", result * -1]; } if (result < 12) { totalHours.text = [NSString stringWithFormat:@"%d", result + 24]; } if (startHours < 12) { totalHours.text = [NSString stringWithFormat:@"%d", result - 24]; }

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• All numbers that are NOT in an array under 1000

  - by baklap

  Hi, I've got this programming problem. I have number for example 1000. Now I have a number in an array, like 999. Now I need to display all numbers that are NOT in the array but are 1 to 1000; The next requirement is essential: It has to be displayed in a way that it's easy to oversee. So I was thinking, lets show: 100 200 300 400 500 600 700 800 900 910 920 930 940 950 960 970 980 990 991 992 993 994 995 996 997 998 1000 What is the best way to start programming this?

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• Big numbers with fraction support

  - by dutt

  I need a c# number something that can handle very large numbers but also fraction support, I looked at System.Numberics.BigInteger coming in .NET 4.0 but I can't get it to work with fractions. something i = 2; something j = 5; something k = i/j; //should be 0.4 when i tried BigInteger i = 2; BigInteger j = 5; double d = (double)(i/j); //d is 0.0 Does anybody know such a library?

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• Performance implications of using a variable versus a magic number

  - by Nathan

  I'm often confused by this. I've always been taught to name numbers I use often using variables or constants, but if it reduces the efficiency of the program, should I still do it? Heres an example: private int CenterText(Font font, PrintPageEventArgs e, string text) { int recieptCenter = 125; int stringLength = Convert.ToInt32(e.Graphics.MeasureString(text, font)); return recieptCenter - stringLength / 2; } The above code is using named variables, but runs slower then this code: private int CenterText(Font font, PrintPageEventArgs e, string text) { return 125 - Convert.ToInt32(e.Graphics.MeasureString(text, font) / 2); } In this example, the difference in execution time is minimal, but what about in larger blocks of code?

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• Only strip commas surrounded by numbers in a string

  - by overlook77

  I am using StreamReader to read each line of a CSV file into a string. As I am processing each line, I need to strip out any commas that ONLY are surrounded by other numbers. For example, if the string was: "textfield1", "textfield2", "100.00", "1,070.00" I would need to only take the comma out of "1,070.00" from this entire string, resulting in: "textfield1", "textfield2", "100.00", "1070.00" Each string read from the CSV file can differ in number of fields, length, etc., so I need to use something (Regular Expressions maybe?) that looks at the entire string without hardcoding a location or blanket removal of all commas. Here is the approach I have been trying: StreamReader sr = new StreamReader(strInputFile); string nextLine = sr.ReadLine(); try { while ((nextLine = sr.ReadLine()) != null) { string rawtext = nextLine.Replace("[0-9]"+","+"[0-9]" , "[0-9]"+"[0-9]"); // ....rest of code } } This obviously doesn't work because I don't understand how to do this :) I am new at C# and inexperienced in Regex, so hopefully this is relatively simple.

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• Javascript adding two numbers incorrectly

  - by Scott

  Global.alert("base: " + base + ", upfront: " + upfront + ", both: " + (base + upfront)); This code above outputs this: base: 15000, upfront: 36, both: 1500036 Why is it joining the two numbers instead of adding them up? I eventually want to set the value of another field to this amount using this: mainPanel.feesPanel.initialLoanAmount.setValue(Ext.util.Format.number((base + upfront), '$0,000.00')); ...and when I try that now it turns the number into the millions instead of 15,036.00. I have no idea why. Any ideas?

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• Python finding n consecutive numbers in a list

  - by lost_in_code

  I want to know how to find if there is a certain amount of consecutive numbers in a row in my list e.g. For example if I am looking for two 1's then: list = [1, 1, 1, 4, 6] #original list list = ["true", "true", 1, 4, 6] #after my function has been through the list. If I am looking for three 1's then: list = [1, 1, 1, 4, 6] #original list list = ["true", "true", "true", 4, 6] #after my function has been through the list. I have tried: list = [1, 1, 2, 1] 1,1,1 in list #typed into shell, returns "(1, 1, True)" Any help would be greatly appreciated, I mainly would like to understand whats going on, and how to check if the next element in the list is the same as the first x amount.

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• Sort List based on dynamically generated numbers in C++

  - by user367322

  I have a list of objects ("Move"'s in this case) that I want to sort based on their calculated evaluation. So, I have the List, and a bunch of numbers that are "associated" with an element in the list. I now want to sort the List elements with the first element having the lowest associated number, and the last having the highest. Once the items are order I can discard the associated number. How do I do this? This is what my code looks like (kind've): list<Move> moves = board.getLegalMoves(board.turn); for(i = moves.begin(); i != moves.end(); ++i) { //... a = max; // <-- number associated with current Move }

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• Weird output as the numbers get bigger in Fibonacci sequence

  - by Jon

  I noticed in my fibonacci sequence that I'm getting negative numbers after a certain point. Does this have to do with the limited range of "int"? or is there something wrong with my code? Here is the code: using std::cout; int main() { int n = 50, f1 = 0, f2 = 1, fn = 0, i = 0; cout << "0 "; for (i = 0; i < n; i++) { fn = f1 + f2; f2 = f1; f1 = fn; cout << fn << " "; }

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• how to form an array of numbers , taken input from a file in C

  - by mekasperasky

  The program should be able to make an array of numbers from a text file which reads like this The data is given as this 123 2132 1100909 3213 89890 my code for it is char a; char d[100]; char array[100]; a=fgetc(fp) // where fp is a file pointer if (a=='') { d[count1]='/0'; strcpy(&array[count],d); count=count+1; memset(d,'\0',100) count1=0; } else { d[count1]=a; count1=count1+1; } a=fgetc(fp);

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• jQuery aspx error function always called, even with apparently valid return data

  - by M Katz

  I am making an ajax call using jQuery (jquery-1.5.2.min.js). The server receives the call. fiddler shows the response text coming back apparently correct. But back in javascript my error: function is called instead of my success: function, and the data of the parameters to the error function don't give much clue as to the problem. Here's the function where I make the initial call: function SelectCBGAtClickedPoint() { $.ajax( { type: "GET", dataType: "text", url: "http://localhost/ajax/SelectCBGAtPoint/1/2", success: function( msg ) { alert( "success: " + msg ); }, error: function( jqXHR, textStatus, errorThrown ) { alert( "error: " + jqXHR + textStatus + errorThrown ); } } ); } Here's the function where I handle the call in my cherrypy server code: def ajax( ajax, *args ): with lock: print "ajax request received: " + str( args ) cherrypy.response.headers[ "Content-Type" ] = "application/text" return "{ x: 0 }" Cherrypy is an odd beast, and I was thinking the problem must lie there. But as I say, I see both the query go out and the response come back in Fiddler. Here is what Fiddler shows as the raw view of the response: HTTP/1.1 200 OK Date: Mon, 11 Apr 2011 17:49:25 GMT Content-Length: 8 Content-Type: application/text Server: CherryPy/3.2.0 { x: 0 } Looks good, but then back in javascript, I get into the error: function, with the following values for the parameters (as shown in firebug): errorThrown = "" jqXHR = Object { readyState=0, status=0, statusText="error"} statusText = "error" I don't know where that word "error" is coming from. That string does not appear anywhere in my cherrypy server code. Note that even though I'm returning a JSON string I've set the send and receive types to "text" for now, just to simplify in order to isolate the problem. Any ideas why I'm getting this "error" reply, even when errorThrown is empty? Could it be that I haven't properly "initialized" either jQuery or jQuery.ajax?

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• Uncrackable anti-piracy protection/DRM even possible? [closed]

  - by some guy

  I hope that this is programming-related enough. You have probably heard about Ubisofts recent steps against piracy. (New DRM requires a constant connection to the Ubisoft server) Many people including me see this as intolerable because the only ones suffering from it at the end are the paying customers. Now to the actual question(s): Ubisoft justified this by calling this mechanism "Uncrackable, only playable by the paying customers". Is a so called uncrackable DRM even possible? You can reverse-engineer and modify everything, even if it takes long. Isn't Ubisoft already lying by calling something not crackable? I mean, hey - With the game you get all its content (textures, models, you know) and some anti-piracy mechanism hardcoded into it. How could that be "uncrackable"? You can just patch the unwanted mechanisms out ---- "Pirates" play the cracked game without problems and the paying customers are the idiots by having constant problems with the game and being unable to play it without a (working) internet connection. What are the points Ubisoft sees in this? If they are at least a bit intelligent and informed they know their anti-piracy protection won't last long. All they get is lower sales, angry customers and happy pirates and crackers.

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• Zend Framework Form Element Validators - validate a field even if not required

  - by Jeremy Hicks

  Is there a way to get a validator to fire even if the form element isn't required? I have a form where I want to validate the contents of a texbox (make sure not empty) if the value of another form element, which is a couple of radio buttons, has a specific value selected. Right now I'm doing this by overriding the isValid() function of my form class and it works great. However, I'd like to move this to either its on validator or use the Callback validator. Here's what I have so far, but it never seems to get called unless I change the field to setRequired(true) which I don't want to do at all times, only if the value of the other form element is set to a specific value. // In my form class's init function $budget = new Zend_Form_Element_Radio('budget'); $budget->setLabel('Budget') ->setRequired(true) ->setMultiOptions($options); $budgetAmount = new Zend_Form_Element_Text('budget_amount'); $budgetAmount->setLabel('Budget Amount') ->setRequired(false) ->addFilter('StringTrim') ->addValidator(new App_Validate_BudgetAmount()); //Here is my custom validator (incomplete) but just testing to see if it even gets called. class App_Validate_BudgetAmount extends Zend_Validate_Abstract { const STRING_EMPTY = 'stringEmpty'; protected $_messageTemplates = array( self::STRING_EMPTY => 'please provide a budget amount' ); public function isValid($value) { echo 'validating...'; var_dump($value); return true; } }

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• Programming an Android Button to update EditText views

  - by bergler77

  Ok guys, I have a button in android that i'm trying to use to update 8 EditText Views with different random numbers. Everything works up until I click the button. It appears I am missing a resource according to the debugger, but I'm not sure what. I've tried several different ways of implementing the button. Here is what I have after looking at several posts. import java.util.Random; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MyCharNewChar extends MyCharActivity { private OnClickListener randomButtonListener = new OnClickListener(){ public void onClick(View v) { //Button creates a set of random numbers and updates the values //of the EditText views. Random rand = new Random(); int STR = 1 + rand.nextInt(12); int AGI = 1 + rand.nextInt(12); int DEX = 1 + rand.nextInt(12); int WIS = 1 + rand.nextInt(12); int INT = 1 + rand.nextInt(12); int CON = 1 + rand.nextInt(12); int HP = 1 + rand.nextInt(20); int AC = 1 + rand.nextInt(6); EditText str = (EditText) findViewById(R.id.str); str.setText(STR); EditText agi = (EditText) findViewById(R.id.agi); agi.setText(AGI); EditText dex = (EditText) findViewById(R.id.dex); dex.setText(DEX); EditText wis = (EditText) findViewById(R.id.wis); wis.setText(WIS); EditText intel = (EditText) findViewById(R.id.intel); intel.setText(INT); EditText con = (EditText) findViewById(R.id.con); con.setText(CON); EditText hp = (EditText) findViewById(R.id.baseHP); hp.setText(HP); EditText ac = (EditText) findViewById(R.id.baseAC); ac.setText(AC); } }; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.newchar); Button randomButton = (Button) findViewById(R.id.randomButton); randomButton.setOnClickListener(randomButtonListener); } } Here is the xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/linearlayoutNew1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/background" > <TextView android:id="@+id/newCharLabel" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/new_character_screen" android:textSize="24dp" android:textColor="@color/splash" android:textStyle="bold" android:gravity="center"/> <TextView android:id="@+id/nameLabel" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/nameLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="textPersonName" > <requestFocus /> </EditText> <TableLayout android:id="@+id/statsLayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="5dp"> <TableRow android:id="@+id/tableRow01" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="5dp"> <TextView android:id="@+id/strLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/strLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/str" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number" /> <TextView android:id="@+id/agiLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/agiLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/agi" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> <TextView android:id="@+id/dexLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/dexLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/dex" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> </TableRow> <TableRow android:id="@+id/tableRow02" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="5dp"> <TextView android:id="@+id/intLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/intLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/intel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> <TextView android:id="@+id/wisLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/wisLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/wis" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> <TextView android:id="@+id/conLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/conLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/con" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> </TableRow> </TableLayout> <LinearLayout android:id="@+id/linearlayoutNew02" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="5dp" android:gravity="center"> <TextView android:id="@+id/baseHPLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hpLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/baseHP" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> <TextView android:id="@+id/baseACLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/acLabel" android:textSize="18dp" android:textColor="@color/splash"/> <EditText android:id="@+id/baseAC" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="3" android:inputType="number"/> </LinearLayout> <LinearLayout android:id="@+id/linearlayoutNew03" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/randomButton" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/randomButton" android:textSize="16dp" android:clickable="true"/> </LinearLayout> </LinearLayout> I have also tried setting the onClick in xml to setup a specific onClick method. Still the same error so I must have a problem elsewhere. Any suggestions would be great!

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• How do you create a program that will ask the user to enter 3 numbers that would display the largest

  - by lobosagwan

  int numbers; int largestNum = 0; Console.WriteLine("Enter numbers : "); numbers=int.Parse(Console.ReadLine()); numbers = 0; for (int i = 0; i < 3; i++) { if (numbers[i] > largestNum) } Console.WriteLine("The largest number is : {0}", largestNum); Console.ReadLine(); this is a similar code, the problem is how to ask the user to enter 3 numbers and display the largest number.

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• Is it possible to efficiently store all possible phone numbers in memory?

  - by Spencer K

  Given the standard North American phone number format: (Area Code) Exchange - Subscriber, the set of possible numbers is about 6 billion. However, efficiently breaking down the nodes into the sections listed above would yield less than 12000 distinct nodes that can be arranged in groupings to get all the possible numbers. This seems like a problem already solved. Would it done via a graph or tree?

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• C# average function for large numbers without overflow exception

  - by Ron Klein

  .NET Framework 3.5. I'm trying to calculate the average of some pretty large numbers. For instance: using System; using System.Linq; class Program { static void Main(string[] args) { var items = new long[] { long.MaxValue - 100, long.MaxValue - 200, long.MaxValue - 300 }; try { var avg = items.Average(); Console.WriteLine(avg); } catch (OverflowException ex) { Console.WriteLine("can't calculate that!"); } Console.ReadLine(); } } Obviously, the mathematical result is 9223372036854775607 (long.MaxValue - 200), but I get an exception there. This is because the implementation (on my machine) to the Average extension method, as inspected by .NET Reflector is: public static double Average(this IEnumerable<long> source) { if (source == null) { throw Error.ArgumentNull("source"); } long num = 0L; long num2 = 0L; foreach (long num3 in source) { num += num3; num2 += 1L; } if (num2 <= 0L) { throw Error.NoElements(); } return (((double) num) / ((double) num2)); } I know I can use a BigInt library (yes, I know that it is included in .NET Framework 4.0, but I'm tied to 3.5). But I still wonder if there's a pretty straight forward implementation of calculating the average of integers without an external library. Do you happen to know about such implementation? Thanks!!

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• Double type returns -1.#IND/NaN error when calculating pi iteratively

  - by Draak

  I am working through a problem for my MCTS certification. The program has to calculate pi until the user presses a key, at which point the thread is aborted, the result returned to the main thread and printed in the console. Simple enough, right? This exercise is really meant to be about threading, but I'm running into another problem. The procedure that calculates pi returns -1.#IND. I've read some of the material on the web about this error, but I'm still not sure how to fix it. When I change double to Decimal type, I unsurprisingly get Overflow Exception very quickly. So, the question is how do I store the numbers correctly? Do I have to create a class to somehow store parts of the number when it gets too big to be contained in a Decimal? Class PiCalculator Dim a As Double = 1 Dim b As Double = 1 / Math.Sqrt(2) Dim t As Double = 1 / 4 Dim p As Double = 1 Dim pi As Double Dim callback As DelegateResult Sub New(ByVal _callback As DelegateResult) callback = _callback End Sub Sub Calculate() Try Do While True Dim a1 = (a + b) / 2 Dim b1 = Math.Sqrt(a * b) Dim t1 = t - p * (a - a1) ^ 2 Dim p1 = 2 * p a = a1 b = b1 t = t1 p = p1 pi = ((a + b) ^ 2) / (4 * t) Loop Catch ex As ThreadAbortException Finally callback(pi) End Try End Sub End Class

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