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  • "Teach" a computer how to do addition?

    - by ffar
    The problem is to learn computer to do addition. Computer have as input a knowladge of a numbers: he "knows" that after 1 goes 2, after 2 goes 3 and so on... Having that data computer can easyly get next number. Next, computer have knowlandge as input that x+0=x and x+(y+1)=(x+1)+y. This axioms let computer to do addition. For example, to add 5 and 3, computer makes following: 5+3 = 5+(2+1) = (5+1)+2 = 6+2 = 6+(1+1) = (6+1)+1 = 7+1 = 8. But this is too long to add numbers in such way. The problem is to develop program which can improve this way of addition using the rules of mathemetics and logic. The goal addition must executed in O(log(N)) time, not O(N) time, N is magnitude of added numbers. Have this program any science value? Is any program can do such things?

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  • Disable form submission via Enter key on only _some fields

    - by justSteve
    I want to retain the conventional 'form submits when i press Enter' behavior because users are familiar with. But by reflex, they often hit enter when they finish with a text input box - but before they are actually done with the complete form. I'd like to hijack the Enter key only when then focus is on a certain class of input. Looking Related Questions this looks like what I'm looking for: if (document.addEventListener) { document.getElementById('strip').addEventListener('keypress',HandleKeyPress,false); } else { document.getElementById('strip').onkeypress = HandleKeyPress; } but the if (document.addEventListener) { is unfamiliar.

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  • Make a simulation using python

    - by user3727759
    I am new to programming and using python. What I am trying to do is create a simulation of a thermostat system by using python. Is there a way to create a program that I can input data, for example temperature and humidity values and then have python constantly plotting the data as I enter the values. This is to simulate a device gathering data and sending it to this program and having it being plotted. I have found ways to plot data by using matplotlib but I have not been able to find a way that I can input the data and have the plot upgrade constantly. Thanks any advise is appreciated.

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  • How to validate if all check boxes are ticked in jQuery?

    - by Jude
    I am a beginner in jQuery and I was wondering how to validate the form before submission specifically for check boxes. I am creating a simple check list form where my user would tick a check box if he finished that step. What I am planning to do is that, the script would prevent the form submission if there is an "unticked" checkbox and highlight it with a color. Here's my code : <!doctype html> <html> <head> <meta charset="utf-8"> <title>checkbox</title> <style> .error { background-color:#F00; } .valid { background-color:#0F0; } </style> <script type="application/javascript" src="http://code.jquery.com/jquery-1.8.2.min.js"> </script> <script type="application/javascript"> function validateAll() { $(".tick").change(function(){ if ($('.tick:checked').length == $('.tick').length) { $('#container').removeClass(); $('#container').addClass('error'); } else { $('#container').removeClass(); $('#container').addClass('valid'); } }); } </script> </head> <body> <div id="container"><input class="tick" id="option1" type="checkbox"></div> <div id="container"><input class="tick" id="option1" type="checkbox"></div> <input id="button" type="button" onClick="validateAll();" value="check"> </body> </html> So what I am trying to do here is when the user clicks the button, the script will highlight all the unchecked check box with red and highlight all checked with green. However, my script is not functioning. What is wrong with my script? Any suggestions on a more efficient way to do this?

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  • Javascript Getting specific element (of parent) by name

    - by Fluidbyte
    I'm using custom tags to define sections in an application, so I have something like this: <mysection> <form> <input name="myfield"> </form> </mysection> I'm using the following and able to get the tag (printed to console, everything is groovy) var parent = document.getElementsByTagName('mysection'); The issue I'm having is finding the child field by name: var myfield = parent.getElementsByName("myfield"); ...as I don't want to pick up on any other 'sections' that might have an input with the name 'myfield'. EDIT: var parent = document.getElementsByTagName('mysection')[0]; was suggested and returns to console the section contents, however, getElementsByName throws an error: Uncaught TypeError: Object #<NodeList> has no method 'getElementsByName'

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  • Merging XMLTextReaders in C#

    - by smithchelluk
    I have a website that needs to pull information from two diffferent XML data sources. Originally I only need to get the data from one source so I was building a URL in the backend that went and retrieved the data from the XML site and then parsed and rendered it in the front end of the website. Now I have to use a 2nd data source and merge the result sets (which are identically structured XML) into one result set. Here is the code I am currently using to get one XML feed. sUrl = sbUrl.ToString(); //The URL for the XML feed XmlDocument xDoc = new XmlDocument(); StringBuilder oBuilder = new StringBuilder(); //The parsed HTML output XmlTextReader oXmlReader = new XmlTextReader(sUrl); oXmlReader.Read(); xDoc.Load(oXmlReader); XmlNodeList List = xDoc.GetElementsByTagName("result"); foreach (XmlNode node in List) { XmlElement key = (XmlElement)node; //BUILD THE OUTPUT HERE } Thanks in advance for your help.

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  • Why does the compiler complain "while expected" when I try to add more code?

    - by user1893578
    Write a program with a word containing @ character as an input. If the word doesn't contain @, it should prompt the user for a word with @. Once a word with @ is read, it should output the word then terminate. This is what I have done so far: public class find { public static void main(String[] args) { System.out.println(" Please enter a word with @ "); Scanner scan = new Scanner(System.in); String bad = "@"; String word = scan.next(); do if (!word.contains(bad)) System.out.println(" Please try again "); else System.out.println(" " + word); while (!word.contains(bad)); } } I can get it to terminate after a word containing "@" is given as input, but if I try to add a Scanner to the line after "please try again", it says while expected.

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  • How do I compare a string in an array to a string?

    - by user1641312
    EDIT: IT'S FIXED, THANKS FOR THE HELP! So basically I have an array of strings, a question and an answer public static String[][] triviaData = { {"Question2", "Answer1"}, {"Question2", "Answer2"}, {"Question3", "Answer3"}, }; And I am trying to make a method that validates an entered input, lets call the entered input enteredAnswer. enteredAnswer is stored as a String. I am trying to validate that the enteredAnswer is the same as the second index of the array. if (enteredAnswer.equalsIgnoreCase(triviaData[Config.CurrentQuestion][1])) { This is the code I tried, but I get the error "Cannot invoke equalsIgnoreCase(String) on the array type String[]" I am a beginner programmer so if you could help me out it would be highly appreciated. Thanks. enteredAnswer is stored as public String[] enteredAnswer;

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  • Please help me out in fetching the desired result from below given DB table structure of MySQL..

    - by OM The Eternity
    Hi All below are the table structures according to which I have to develop the desired output(given at the end) tbl_docatr docatr_id doc_id docatrtype_id docatr_float docatr_int docatr_date docatr_varchar docatr_blob 1 12 1 NULL NULL NULL testing [BLOB - NULL] 2 12 2 NULL NULL NULL Tesitng [BLOB - NULL] tbl_docatrtype docatrtype_id docatrtypegroup_id docatrtypetype_id docatrtype_name 1 1 4 Name 2 1 4 Company Name tbl_docatrtypetype docatrtypetype_id docatrtypetype_name 1 Float 2 Int 3 Date 4 String line Above are three tables from which I have to display the desired output as Name : testing Company Name : Tesitng such that at first step I have doc_id then I get docatrtype_id and then docatrtypetype_id acording to these values i have to fetch the result. Also the query must see the doactrtypetype_id from table tbl_docatrtypetype and fetch the result from tbl_docatr from respective column docatr_float, docatr_int, docatr_date, docatr_varchar, docatr_blob Please help!!!

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  • dynamic memory allocation [closed]

    - by gcc
    i wanna write a program that creates (allocating memory) and manipulates (adding elements and increasing memory etc.) integer arrays dynamically according to given input sequences. input sequence which starts with the maximum number of arrays, includes integers to be put into arrays and some one letter characters which are commands to carry out some tasks (activating next array, deleting an array etc). also, i wanna create *c_arrays which is the address of the array whose elements are the actual capacities (How many integer slots are already allocated for an array?) of arrays how should i organize(set up) the algorithm?

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  • Empty data was able to be stored to the Database in CakePHP even if "Not Null" had been specified.

    - by kwokwai
    Hi all, I was doing some self learning on CakePHP 1.26 with Mysql 5. I got a simple table with only one field and had applied "Not Null" to this field. This field in the table was corresponding to a Input text box in a HTML form. I tried not to enter anything into the Input text field, and then I saw that empty data was able to be stored into the Table even if "Not Null" had been applied to this field. I am confused of this result. Could you help me please?

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  • realizing number ...how?? [closed]

    - by gcc
    i hold input like that A is char pointer A[0]=n A[1]=j A[2]=n A[3]=d . there is one number in A[] and every A[i] is important for me because what will i do in next step is determined by input in A[i] or A[n] A[j]=$ . A[i]=14(any number) . . int func(int temp) { if(temp=='n') ..do something then return 10; if(temp=='j') .. return 11; if(temp=='d') .. return 12; if(........) when temp find/realize number ,i wanna return 13; in if statement, what code should i write } how i can do }

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  • Writing out to a file in scheme

    - by Ceelos
    The goal of this is to check if the character taken into account is a number or operand and then output it into a list which will be written out to a txt file. I'm wondering which process would be more efficient, whether to do it as I stated above (writing it to a list and then writing that list out into a file) or being writing out into a txt file right from the procedure. I'm new with scheme so I apologize if I am not using the correct terminology (define input '("3" "+" "4")) (define check (if (number? (car input)) (write this out to a list or directly to a file) (check the rest of file))) Another question I had in mind, how can I make it so that the check process is recursive? I know it's a lot of asking but I've getting a little frustrated with checking out the methods that I have found on other sites. I really appreciate the help!

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  • many-to-many relationship in CI (not using ORM)

    - by Ross
    I'm implementing a categories system in my CI app and trying to work out the best way of working with many to many relationships. I'm not using an ORM at this stage, but could use say Doctrine if necessary. Each entry may have multiple categories. I have three tables (simplified) Entries: entryID, entryName Categories: categoryID, categoryname Entry_Category: entryID, categoryID my CI code returns a record set like this: entryID, entryName, categoryID, categoryName but, as expected with Many-to-Many relationships, each "entry" is repeated for each "category". What would the best way to "group" the categories so that when I output the results, I am left with something like: Entry Name Appears in Category: Foo, Bar rather than: Entry Name Appears in Category: Foo Entry Name Appears in Category: Bar I believe the option is to track if the post ID matches a previous entry, and if so, store the respective category, and output it as one, rather than several, but am unsure of how to do this in CI. thanks for any pointers (I appreciate this is may be a vague/complex question without a better knowledge of the system).

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  • PHP Losing variable data

    - by Conor B
    Hi, I'm having an issue with PHP losing data in a variable. There is quite a bit of data in the variable, because it basically contains a binary file, but I'm wondering if this is cause for it to completely lose it's information. Looking at a snippet from my code which is used to deal with email attachments: var_dump($data) if (array_key_exists('filename', $params) || array_key_exists('name', $params)) { var_dump($data) ... } The first var_dump gives the desired output of the file: "string(283155) " --Apple-Mail-5-930065543 ... etc while the second gives an output of: string(0) "" ... string(0) "" Any idea why this is happening? Does PHP just drop data in variables if they are really large? (I didn't think so, as I've never had this problem before) If so, any workaround? Thanks!

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  • writing a single line of a file in C++ into two different arrays

    - by mekasperasky
    suppose a text file has 11001100 11001101 and i open the text file and take the input from the file as pt[0]=11001100, pt[1]=11001101.. but if i take the input from file as inpt it wont put it in two different arrays which is obvious but it takes the whole line . Thus I have to take another for loop and traverse through the whole string and when I find a null character i start putting into the second array . But how can I do it without putting it into a variable and traversing .. I mean directly from the file itself ..

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  • Validate NSString

    - by Chris
    I am validating an NSString to ensure that the string does not contain apostrophes. The code I'm using to do this is NSCharacterSet * invalidNumberSet = [NSCharacterSet characterSetWithCharactersInString:@"'"]; NSScanner * scanner = [NSScanner scannerWithString:string]; NSString * scannerResult; [scanner setCharactersToBeSkipped:nil]; [scanner scanUpToCharactersFromSet:invalidNumberSet intoString:&scannerResult]; if(![string isEqualToString:scannerResult]) { return 2; } Returning 2 represents an error. This code works, except for the case where the string is an apostrophe. To get around this issue, I added the following code above the preceding block. if([string isEqualToString:@"'"]); { return 2; } This code is evaluating to true, regardless of the input. I need to either prevent the first block from crashing with the input of ', or get the second block to work. What am I missing?

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  • Trouble with ID in NSString

    - by useboot
    I am trying to create something interesting in my application. So, I created an UILabel and I want to output new value. So, my code. NSString *test = @"13"; self.UserAge.text = @"Your age is %@", test; But it doesn't work. In Console-Command Mode I can do it with NSLog(); My result is "Your age is %@". But I need to output "Your age is 13". What do I should do with name? Sorry, if my question is easy for you. I am beginner. :) Thank you everyone who will answer on my question.

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  • How to make href will work on button in IE8

    - by bob
    I want href will work on type="button"in IE8. <a href="submit.php"><input type="button" value="Submit" class="button" /></a> Other browser working fine but on IE8 the code above not working. How to fix it? Update <form action="submit.php" method="post""> <input type="submit" value="Submit" class="button" /> </form> I know this way can be done. But I want to know other ways how to make it work on IE8 without to have the <form></form>

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  • STL ostream_iterator writes to screen even though I overwrote it?

    - by adam_0
    In my code, I have the following: ostream_iterator<double> doubleWriter(cout, " ~ "); // ... *doubleWriter = 1.1; doubleWriter++; *doubleWriter = 2.2; *doubleWriter = 3.3; // shouldn't 2.2 be overwritten? doubleWriter++; *doubleWriter = 44.2; cout << endl << endl; I expected it to output this: 1.1 ~ 3.3 ~ 44.2 ~ Instead, the output was this: 1.1 ~ 2.2 ~ 3.3 ~ 44.2 ~ Why does this happen? It would seem to me that I overwrite 2.2 and stick 3.3 in its spot, since I didn't increment. Is incrementation an optional step?

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  • how to generate XML (in String representation) in java

    - by flyingfromchina
    I have defined a java class, but only need to output some of the fields of this class into an XML. The returned type must be a String. I first opted for the easiest way using a StringBuffer. However, when I tried to process the output String represenation, it failed. I think it is mostly likely because there are some characters that are not encoded in the UTF-8 in the input. Could someone tell me what is the best way to handle this? Thanks.

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