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  • What is a Bias Value of Floating Point Numbers?

    - by mudge
    In learning how floating point numbers are represented in computers I have come across the term "bias value" that I do not quite understand. The bias value in floating point numbers has to do with the negative and positiveness of the exponent part of a floating point number. The bias value of a floating point number is 127 which means that 127 is always added to the exponent part of a floating point number. How does doing this help determine if the exponent is negative or positive or not?

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  • How do I allow users to dial numbers in my tableView cells?

    - by Griffo
    Hi all, I have a table containing cells with phone numbers. How can I allow the user to dial these numbers by tapping the row? It's not working by default and there's no option in interface builder like there is for uiwebviews so I imagine I need to programmatically tell the app to dial the number when the cell is tapped.

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  • How can I quickly sum all numbers in a file?

    - by Mark Roberts
    I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions?

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  • Prevent Negative numbers for Age without using client side validation.

    - by Deepak
    Hi People, I have an issue in Core java. Consider the Employee class having an attribute called age. class Employee{ private int age; public void setAge(int age); } My question is how do i restrict/prevent setAge(int age) method such that it accepts only positive numbers and it should not allow negative numbers, Note: This has to be done without using client side validation.how do i achieve it using Java/server side Validation only.The validation for age attribute should be handled such that no exception is thrown

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  • I'm trying to match some numbers in a string using a regexpressions and am having difficulty with th

    - by Ryan
    here is the line i'm trying to parse [\\?\Volume{d3f7f470-526b-11df-92eb-001a647802d2}\] 85 90 NotFound I'm basically just trying to get the numbers that are outside of the brackets and ignore anything in between the brackets. My original syntax worked until I realized that sometimes there would be numbers in the brackets (I was just using "([0-99]{2})") any help would be greatly appreciated. Thanks

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  • How can I enter only numbers in TextBox using JavaScript without disable right click ?

    - by Space Cracker
    I want to allow numbers only to be allowed for a textbox and I already do it onkeydown event by allow only numbers and prevent ctrl+V but I have two problems : if I make right click then paste so any char can be entered and I want a solution without disable right click by oncontextmenu="return false;" if I drag and drop any text it will be entered Is there any solution that can work in all browsers without problem ?

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  • How do I generate a random string of up to a certain length?

    - by slavy13
    I would like to generate a random string (or a series of random strings, repetitions allowed) of length between 1 and n characters from some (finite) alphabet. Each string should be equally likely (in other words, the strings should be uniformly distributed). The uniformity requirement means that an algorithm like this doesn't work: alphabet = "abcdefghijklmnopqrstuvwxyz" len = rand(1, n) s = "" for(i = 0; i < len; ++i) s = s + alphabet[rand(0, 25)] (pseudo code, rand(a, b) returns a integer between a and b, inclusively, each integer equally likely) It doesn't work because shorter lengths are as likely as longer ones, meaning it's more likely to generate a shorter string than a longer one, so the result is not uniform.

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  • How do I generate a random time interval and add it to a mysql datetime using php?

    - by KeenLearner
    I have many rows in mysql table with datetime's in the format of: 2008-12-08 04:16:51 etc I'd like to generate a random time interval of anywhere between 30 seconds, and 3 days and add them to the time above. a) how do I generate a random time between 30 and 3 days? b) how do I add this time to the date time format above? I imagine i need to do a loop to pull out all the info, do the math in php, and then update the row... Any ideas?

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  • Why is using a Non-Random IV with CBC Mode a vulnerability?

    - by The Rook
    I understand the purpose of an IV. Specifically in CBC mode this insures that the first block of of 2 messages encrypted with the same key will never be identical. But why is it a vulnerability if the IV's are sequential? According to CWE-329 NON-Random IV's allow for the possibility of a dictionary attack. I know that in practice protocols like WEP make no effort to hide the IV. If the attacker has the IV and a cipher text message then this opens the door for a dictionary attack against the key. I don't see how a random iv changes this. (I know the attacks against wep are more complex than this.) What security advantage does a randomized iv have? Is this still a problem with an "Ideal Block Cipher"? (A perfectly secure block cipher with no possible weaknesses.)

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  • What could be causing Windows to randomnly reset the system time to a random time?

    - by Jonathan Dumaine
    My Windows 7 machine infuriates me. It cannot hold a date. At one point it all worked fine, but now it will decide that it needs to change the system time to a random time and date either in the future or past. There seems to be no correlation or set interval of when it happens. To remedy it I have: Correctly set the time in bios. Replaced the motherboard battery with a new CR2032 (even checked it with a multimeter). Tried disabling automatic internet synchronizing via "Date and Time" dialog. Stopped, restarted, left disabled the Windows Time service. Yet with all of these actions, the time will continue to change. Any ideas?

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  • Random BSODs on Win7 boot. Can't find a valid reason.

    - by 0plus1
    Hi, I bought and assembled a new pc: ASUS m4a785td-v EVO AMD x4 620 OCZ Black Edition 2x 2gb WD 500gb sata Win7 Ultimate 64bit fresh install BSOD on boot. Formatted, reinstalled, BSOD on install. Ran memtest - no errors. Ran Win7 install in safe mode. Installed, random BSOD on win7 startup, even in safe mode. Updated BIOS. Ran the win7 memtest (no error), booted after some tries and ran Prime95 blend test for 12 hours straight with no errors at all! When the pc has booted, win7 runs as smooth as possible, I've been playing STALKER for 4 hours straight with not a single hiccup. Using Blue Screen View I can see that every BSOD involves: ntoskrnl.exe Here are the dumps Any help would be greatly appreciated, this thing is driving me crazy.

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  • What could be causing Windows to randomly reset the system time to a random time?

    - by Jonathan Dumaine
    My Windows 7 machine infuriates me. It cannot hold a date. At one point it all worked fine, but now it will decide that it needs to change the system time to a random time and date, either in the future or past. There seems to be no correlation or set interval of when it happens. In attempt to remedy this, I have: Correctly set the time in BIOS. Replaced the motherboard battery with a new CR2032 (even checked it with a multimeter). Tried disabling automatic internet synchronizing via "Date and Time" dialog. Stopped, restarted, left disabled the Windows Time service. Yet with all of these actions, the time will continue to change. Any ideas?

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  • Apache crashing at random intervals. Can not find a reason in log files

    - by Nick Downton
    We are having an issue with a VPS running plesk 9.5 on ubuntu 8.04 At seemingly random intervals Apache will disappear and needs to be started manually. I have checked the apache error log, /var/log/messages, individual virtual host apache error files and cannot find anything that coincides with the time of the failure. dmesg is empty which is a bit odd. We have also had the psa service go down for no apparent reason but apache stay up. I'm at a loss to diagnose this really because all the log files I can find do not point to any issues. Are there any others I can look at? Memory usage sits at about 55% (out of 400mb) and it isn't a particularly high trafficed server. Any pointers as to where else I can find out what is going on would be very much appreciated. Nick

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  • is it okay to use random URLs instead of passwords?

    - by stew
    Is it considered "safe" to use URL constructed from random characters like this? http://example.com/EU3uc654/Photos I'd like to put some files/picture galleries on a webserver that are only to be accessed by a small group of users. My main concern is that the files should not get picked up by search-engines or curious power-users that poke around my site. I've set up an .htaccess file, just to notice that clicking on http://user:pass@url/ links doesn't work well with some browsers/email clients, prompting dialogs and warnings messages that confuse my not-too-computer-savy users.

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  • What are these completely random images that pop up when using Recuva?

    - by Qubert
    I just used Recuva to get back some photos I accidentally deleted on C:, but I also noticed there's a bunch of COMPLETELY random images in the list of recoverable files I can choose from. An example would be, There are images with names like John_Doe.jpg with a file path somewhere out of C:/Windows/Assembly/ And some of these things don't even make sense, there's one called componentsSpriteImage with the path C:/?/Images that shows a "poster" from the TV series Gold Rush. I am completely lost on this.. I know the OS is on C:, but I can't really think of a reason why Microsoft would leave a image hanging around from Gold Rush.

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  • Java - Draw Cards and Eliminate Cards Problem

    - by Jen
    I am having a problem in this question. I want a system inside a game wherein the player draws 2 cards randomly, and the enemy draws 2 cards randomly. Then, what the program does is to print out to the console the cards the player draw and the enemy's. The cards should not conflict and must not be the same. Then lastly, the program prints out the card that was not drawn by both the player and the enemy. Here's how I did it but it was lengthy and full of errors: import java.util.Random; public class Draw { public static Random random = new Random(); public static String cards[] = {"Hall", "Kitchen", "Billiard", "Study", "Pool"}; public static int playercounter; public static int enemycounter; public static String playercardA = null; public static String playercardB = null; public static String enemycardA = null; public static String enemycardB = null; public String lastcard = null; public static void playercardAdraw() { playercounter = random.nextInt(5); playercardA = cards[playercounter]; } public static void playercardBdraw() { playercounter=random.nextInt(5); playercardB= cards[playercounter]; if (playercardB==playercardA || playercardB == enemycardA || playercardB == enemycardB) { return; } } public static void enemycardAdraw () { enemycounter = random.nextInt(5); enemycardA=cards[enemycounter]; if (enemycardA == playercardA || enemycardA == playercardB) { return; } } public static void enemycardBdraw () { enemycounter = random.nextInt(5); enemycardB=cards[enemycounter]; if (enemycardB == playercardA || enemycardB == playercardB || enemycardB == enemycardA) { return; } } public static void main (String args []) { System.out.println("Starting to draw..."); System.out.println("Player's Turn: "); playercardAdraw(); System.out.println("Player's first card: " + playercardA); playercardBdraw(); System.out.println("Player's second card: " + playercardB); System.out.println("Enemy's Turn: "); enemycardAdraw(); System.out.println("Enemy's first card: " + enemycardA); enemycardBdraw(); System.out.println("Enemy's Second card: " + enemycardB); } }

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