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• Formatting a barcode with hyphens in between - Assignment question

  - by capex

  Hi, The assignment at my first year uni computing course says my program should read a barcode number, and then display the same 13 digit barcode number separated by hyphens. For example, 9300675016902 should look like 930-067501-690-1. The restrictions say I can't use the following: No arrays No strings No functions. Any directions on this? (So far I have done this: part1 = barcode/10000000000; which gives me the first three digits, and this: part4 = barcode%10; which gives me the last digit. Thanks in advance!

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• Fluent NHib causing visual studio 2010 hanging at runtime

  - by Berryl

  Just installed and migrated a 2008 solution on Vista ultimate 64 and .net 4.0. Everything builds and tests run surprisingly well but I got the hang description below while trying to run the app under SQLite. It turns out that the hang has got something to do when the call is made for FNH to build the session factory during a run, the only feedback I get is that the database wasn't configure properly without any inner exception. The strange part is that the exact code works perfectly under tests. Any clues? Description: A problem caused this program to stop interacting with Windows. Problem signature: Problem Event Name: AppHangB1 Application Name: devenv.exe Application Version: 10.0.30319.1 Application Timestamp: 4ba1fab3 Hang Signature: b9ed Hang Type: 6152 OS Version: 6.0.6002.2.2.0.256.1 Locale ID: 1033 Additional Hang Signature 1: 005de38e6b4bb3afd8e147932c6431cc Additional Hang Signature 2: d54c Additional Hang Signature 3: 05f671c8289bf8dd31e6ccfe265baa77 Additional Hang Signature 4: 784c Additional Hang Signature 5: c8207f54dadf3eb38dfcf1ae152f4229 Additional Hang Signature 6: ff83 Additional Hang Signature 7: 220932152f3f04fffb6ca3abf15e6dc6

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• graphviz segmentation fault

  - by LucaB

  Hi I'm building a graph with many nodes, around 3000. I wrote a simple python program to do the trick with graphviz, but it gives me segmentation fault and I don't know why, if the graph is too big or if i'm missing something. The code is: #!/usr/bin/env python # Import graphviz import sys sys.path.append('..') sys.path.append('/usr/lib/graphviz') import gv # Import pygraph from pygraph.classes.graph import graph from pygraph.classes.digraph import digraph from pygraph.algorithms.searching import breadth_first_search from pygraph.readwrite.dot import write # Graph creation gr = graph() file = open('nodes.dat', 'r') line = file.readline() while line: gr.add_nodes([line[0:-1]]) line = file.readline() file.close() print 'nodes finished, beginning edges' edges = open('edges_ok.dat', 'r') edge = edges.readline() while edge: gr.add_edge((edge.split()[0], edge.split()[1])) edge = edges.readline() edges.close() print 'edges finished' print 'Drawing' # Draw as PNG dot = write(gr) gvv = gv.readstring(dot) gv.layout(gvv,'dot') gv.render(gvv,'svg','graph.svg') and it crashes at the gv.layout() call. The files are somthing like: nodes: node1 node2 node3 edges_ok: node1 node2 node2 node3

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• my version of strlcpy

  - by robUK

  Hello, gcc 4.4.4 c89 My program does a lot of string coping. I don't want to use the strncpy as it doesn't nul terminate. And I can't use strlcpy as its not portable. Just a few questions. How can I put my function those its paces to ensure that it is completely safe and stable. Unit testing? Is this good enough for production? size_t s_strlcpy(char *dest, const char *src, const size_t len) { size_t i = 0; /* Always copy 1 less then the destination to make room for the nul */ for(i = 0; i < len - 1; i++) { /* only copy up to the first nul is reached */ if(*src != '\0') { *dest++ = *src++; } else { break; } } /* nul terminate the string */ *dest = '\0'; /* Return the number of bytes copied */ return i; } Many thanks for any suggestions,

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• How to get a flat, non-interpolated color when using vertex shaders.

  - by Brett

  Hi, Is there a way to achieve this? If I draw lines like this glShadeModel(GL_FLAT); glBegin(GL_LINES); glColor3f(1.0, 1.0, 0.0); glVertex3fv(bottomLeft); glVertex3fv(topRight); glColor3f(1.0, 0.0, 0.0); glVertex3fv(topRight); glVertex3fv(topLeft); . . (draw a square) . . glEnd(); I get the desired result (a different colour for each edge) but I want to be able to calculate the fragment values in a shader. If I do the same after setting up my shader program I always get interpolated colors between vertices. Is there a way around this? (would be even better if I could get the same results using quads) Thanks

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• Why can't my main class see the array in my calender class

  - by Rocky Celltick Eadie

  This is a homework problem. I'm already 5 days late and can't figure out what I'm doing wrong.. this is my 1st semester in Java and my first post on this site Here is the assignment.. Create a class called Calendar. The class should contain a variable called events that is a String array. The array should be created to hold 5 elements. Use a constant value to specify the array size. Do not hard code the array size. Initialize the array in the class constructor so that each element contains the string “ – No event planned – “. The class should contain a method called CreateEvent. This method should accept a String argument that contains a one-word user event and an integer argument that represents the day of the week. Monday should be represented by the number 1 and Friday should be represented by the number 5. Populate the events array with the event info passed into the method. Although the user will input one-word events, each event string should prepend the following string to each event: event_dayAppoinment: (where event_day is the day of the week) For example, if the user enters 1 and “doctor” , the first array element should read: Monday Appointment: doctor If the user enters 2 and “PTA” , the second array element should read: Tuesday Appointment: PTA Write a driver program (in a separate class) that creates and calls your Calendar class. Then use a loop to gather user input. Ask for the day (as an integer) and then ask for the event (as a one word string). Pass the integer and string to the Calendar object’s CreateEvent method. The user should be able enter 0 – 5 events. If the user enters -1, the loop should exit and your application should print out all the events in a tabular format. Your program should not allow the user to enter invalid values for the day of the week. Any input other than 1 – 5 or -1 for the day of the week would be considered invalid. Notes: When obtaining an integer from the user, you will need to use the nextInt() method on your Scanner object. When obtaining a string from a user, you will need to use the next() method on your Scanner object. Here is my code so far.. //DRIVER CLASS /** * * @author Rocky */ //imports scanner import java.util.Scanner; //begin class driver public class driver { /** * @paramargs the command line arguments */ //begin main method public static void main(String[] args) { //initiates scanner Scanner userInput = new Scanner (System.in); //declare variables int dayOfWeek; String userEvent; //creates object for calender class calendercalenderObject = new calender(); //user prompt System.out.println("Enter day of week for your event in the following format:"); System.out.println("Enter 1 for Monday"); System.out.println("Enter 2 for Tuesday"); System.out.println("Enter 3 for Wednsday"); System.out.println("Enter 4 for Thursday"); System.out.println("Enter 5 for Friday"); System.out.println("Enter -1 to quit"); //collect user input dayOfWeek = userInput.nextInt(); //user prompt System.out.println("Please type in the name of your event"); //collect user input userEvent = userInput.next(); //begin while loop while (dayOfWeek != -1) { //test for valid day of week if ((dayOfWeek>=1) && (dayOfWeek<=5)){ //calls createEvent method in calender class and passes 2 variables calenderObject.createEvent(userEvent,dayOfWeek); } else { //error message System.out.println("You have entered an invalid number"); //user prompts System.out.println("Press -1 to quit or enter another day"); System.out.println("Enter 1 for Monday"); System.out.println("Enter 2 for Tuesday"); System.out.println("Enter 3 for Wednsday"); System.out.println("Enter 4 for Thursday"); System.out.println("Enter 5 for Friday"); System.out.println("Enter -1 to quit"); //collect user input dayOfWeek = userInput.nextInt(); //end data validity test } //end while loop } //prints array to screen int i=0; for (i=0;i<events.length;i++){ System.out.println(events[i]); } //end main method } } /** * * @author Rocky */ //imports scanner import java.util.Scanner; //begin calender class public class calender { //creates events array String[] events = new String[5]; //begin calender class constructor public calender() { //Initializes array String[] events = {"-No event planned-","-No event planned-","-No event planned-","-No event planned-","-No event planned-"}; //end calender class constructor } //begin createEvent method public String[] createEvent (String userEvent, int dayOfWeek){ //Start switch test switch (dayOfWeek){ case 1: events[0] = ("Monday Appoinment:") + userEvent; break; case 2: events[1] = ("Tuesday Appoinment:") + userEvent; break; case 3: events[2] = ("WednsdayAppoinment:") + userEvent; break; case 4: events[3] = ("Thursday Appoinment:") + userEvent; break; case 5: events[4] = ("Friday Appoinment:") + userEvent; break; default: break; //End switch test } //returns events array return events; //end create event method } //end calender class }

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• In Android Browser link does not always execute onClick causing focus instead

  - by Artem

  I am trying to program a very standard JS behavior for a link using an HREF onClick handler, and I am facing a strange problem caused by what I believe to be focus/touch mode behavior on Android. Sometimes when I click on the link, instead of executing the action, it simply becomes selected/focused, with either just a focus rectangle or even also with a filled focus rectangle (selected as opposed to just focused?). The pseudo-code right now is <a href="#" onClick="toggleDivBelowToShowHide(); return false;">go</a> I have tried doing something like: <a href="#" onTouchStart="toggleDivBelowToShowHide(); return false;">go</a> But I still get the same pesky problem some of the time.

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• Unable to catch exception from Activator.CreateInstance.

  - by Patrik Hägne

  OK, I admit it this code will just look weird to you, and that's because it is weird. This is just code to reproduce the behavior, not code I want to use. class Program { static void Main(string[] args) { try { Activator.CreateInstance(typeof(Func<int>), new object[] { new object(), IntPtr.Zero }); } catch { Console.WriteLine("This won't print!"); } Console.Write("Actually this will not print either!"); Console.ReadLine(); } } No matter what exception type I try to catch (the actual exception thrown is an ArgumentException as far as I can tell) the code inside the catch block will not execute. Actually execution will just stop at the Activator.CreateInstance-line.

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• time required in java

  - by Amol

  i would like to know how much time is required to execute the conditional loops individually. Like if i had an option to use "if else", "while","for", or "foreach" loop then which loop would get executed faster.I know the difference would be very small and most would say that it would not matter but if i were to have a program which would access thousands of data then this point would come into picture. I would like to know if i declare a variable in the beginning in java and if i were to declare it just before i use it will it make any difference. will the total time required be reduced? if yes then which is practically used (the one in which variables are declared in the beginning or where they are just declared b4 they are used)?

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• eclipse CDT - Cannot open .gcda files

  - by Taani

  I am developing a coverage data tool in eclipse cdt. I used gcov and build and execute my C program to generate .gcda and .gcno files. When double click on .gcda file to see the coverage data, below error message displays. An error has occurred. See error log for more details. org.eclipse.linuxtools.binutils.utils.STSymbolManager.demangle(Lorg/eclipse/cdt/core/IBinaryParser$IBinaryObject;Ljava/lang/String;Lorg/eclipse/core/resources/IProject;)Ljava/lang/String; But I already downloaded and save org.eclipse.linuxtools.binutils_4.0.0.201209191645.jar into plugins directory. Where am I doing wrong?

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• How do I work with WIndows Forms in WPF?

  - by xarzu

  How do I work with WIndows Forms in WPF? In my WPF program I created a Windows Form class. In this Form, I placed an OK button and I went into the properties of the button and set the DialogResult to OK. Now, I am calling this Dialog (Window Form) from the MainWindow.xaml.cs: dres = form.ShowDialog(); if (dres != DialogResult.OK) return; The compiler is complaining: Error 3 'System.Nullable<bool>' does not contain a definition for 'OK' and no extension method 'OK' accepting a first argument of type 'System.Nullable<bool>' could be found (are you missing a using directive or an assembly reference?)

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• Looking for a free tool to visualize object relationships for C#

  - by vfilby

  Here is my ideal solution: a free tool that reads a .csporj or .sln and generates a pretty picture that shows all the objects and how they are related. By relationships, I don't mean inheritance but rather dependency. For example, if we have a Car object and Car has a member variable Wheel, I would like that Car depends on Wheel to be visualized in the graph. I know visual studio can do inheritance graphs, but that is only half of what I am looking for. Is what I am looking for possible? Are there any tools that do something similar? Related question for java: http://stackoverflow.com/questions/1824261/are-there-any-tools-to-visualize-the-objects-being-used-in-a-program

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• How to set the path to "context path" for uploaded files using Apache Common fileupload?

  - by BugKiller

  Hi, I'm using Apache common fileupload library with Netbeans 6.8 + Glassfish.I'm trying to change the current upload path to be in the current context path of the servlet , something like this: WEB-INF/upload so I wrote : File uploadedFile = new File("WEB-INF/upload/"+fileName); session.setAttribute("path",uploadedFile.getAbsolutePath()); item.write(uploadedFile); but I notice that the library save the uploaded files into glassfish folder , here what I get when I print the absolute path of the uploaded file : C:\Program Files\sges-v3\glassfish\domains\domain1\WEB-INF\upload\xx.rar My Question : How can I force the common fileupload to save the uploaded file in a path relative to the current servlet path , so I don't need to specify the whole path ? is this possible ?

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• NSString stringWithFormat: with C array?

  - by Chris Long

  Hi, I'm writing a program that calculates the Jacobi algorithm. It's written in Objective-C since it runs on a Mac, but the majority is written in standard C. I'm using a two-dimensional C array and an NSArray containing 5 NSTextField labels. The following code yields an EXC_BAD_ACCESS error: for ( int i = 0; i < 5; i++ ) { NSString *resultString = [NSString stringWithFormat:@"%g", matrix[i][i] ]; [[resultLabels objectAtIndex:i] setStringValue:resultString]; // error line } Any help?

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• Hiding a value in an Android application

  - by Ewan

  Hi, I need to hide a value in a mobile (Android OS) application. As far as I can see, encrypting the value is of no use as the key to the encryption mechanism must be available to the program and is thus available to an attacker reverse-engineering the code. So, it seems that the only "solution" is to hide the secret value in the application as well as possible, obviously not ideal. Any comments? Am I missing something? If not, what's the best way to hide the value? Thanks for your ideas! Ewan

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• Embedding binary blobs using gcc mingw

  - by myforwik

  I am trying to embed binary blobs into an exe file. I am using mingw gcc. I make the object file like this: ld -r -b binary -o binary.o input.txt I then look objdump output to get the symbols: objdump -x binary.o And it gives symbols named: _binary_input_txt_start _binary_input_txt_end _binary_input_txt_size I then try and access them in my C program: #include <stdlib.h> #include <stdio.h> extern char _binary_input_txt_start[]; int main (int argc, char *argv[]) { char *p; p = _binary_input_txt_start; return 0; } Then I compile like this: gcc -o test.exe test.c binary.o But I always get: undefined reference to _binary_input_txt_start Does anyone know what I am doing wrong?

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• Can someone explain this "endian-ness" function for me?

  - by Mike

  Write a program to determine whether a computer is big-endian or little-endian. bool endianness() { int i = 1; char *ptr; ptr = (char*) &i; return (*ptr); } So I have the above function. I don't really get it. ptr = (char*) &i, which I think means a pointer to a character at address of where i is sitting, so if an int is 4 bytes, say ABCD, are we talking about A or D when you call char* on that? and why? Would some one please explain this in more detail? Thanks. So specifically, ptr = (char*) &i; when you cast it to char*, what part of &i do I get?

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• PHP Menu Question

  - by Vecta

  As one of the steps toward a greater website redesign I am putting the majority of the content of our website into html files to be used as includes. I am intending on passing a variable to the PHP template page through the URL to call the proper include. Our website has many programs that each need an index page as well as about 5 sub-pages. These program pages will need a menu system to navigate between the different pages.I am naming the pages pagex_1, pagex_2, pagex_3, etc. where "pagex" is descriptive of the page content. My question is, what would be the best way to handle this menu system? Is there a way to modify the initial variable used to arrive at the index page to create links in the menu to arrive at the other pages? Thanks for any help!

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• Next step for Python app using Sqlite db

  - by ChrisC

  I want to write a db program in Python using Sqlite. I have the db table structure planned, and am ready to move to the next step, which I think is to work any bugs out of the db structure. I am totally inexperienced in development except for writing the original db (written in MS Access), and an Intro to C++ class (OOP concepts and console C++ programs). Is it time to test the db structure? If so, what's the best way, and what tool(s) should I use? Thank you.

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• Processing files with C# in folders whose names contain spaces

  - by Nigel Ainscoe

  There are plenty of C# samples that show how to manipulate files and directories but they inevitably use folder paths that contain no spaces. In the real world I need to be able to process files in folders with names that contain spaces. I have written the code below which shows how I have solved the problem. However it doesn't seem to be very elegant and I wonder if anyone has a better way. class Program { static void Main(string[] args) { var dirPath = @args[0] + "\\"; string[] myFiles = Directory.GetFiles(dirPath, "*txt"); foreach (var oldFile in myFiles) { string newFile = dirPath + "New " + Path.GetFileName(oldFile); File.Move(oldFile, newFile); } Console.ReadKey(); } } Regards, Nigel Ainscoe

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• For reliable code, NModel, Spec Explorer, F# or other?

  - by ja

  I've got a business app in C#, with unit tests. Can I increase the reliability and cut down on my testing time and expense by using NModel or Spec Explorer? Alternately, if I were to rewrite it in F# (or even Haskell), what kinds (if any) of reliability increase might I see? Code Contracts? ASML? I realize this is subjective, and possibly argumentative, so please back up your answers with data, if possible. :) Or maybe an worked example, such as Eric Evans Cargo Shipping System? If we consider Unit tests to be pecific and strong theorems, checked quasi-statically on particular “interesting instances” and Types to be general but weak theorems (usually checked statically), and contracts to be general and strong theorems, checked dynamically for particular instances that occur during regular program operation (from B. Pierce's Types Considered Harmful, where do these other tools fit? We could pose the analogous question for Java, using Java PathFinder, Scala, etc.

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• Use API or SQL to detect new Support Tickets?

  - by David Powers

  I currently work for a company that uses Kayako for their support system. They sell an extra program called Insta Alert that plays a sound when a new ticket is submitted. I use WHMCS for my own company, and would like to develop something to work with it that does the same thing. Here is the WHMCS API... http://wiki.whmcs.com/API:Functions I am wondering if it would make more sense from a remote C++ application to use the API or just check the MySQL database for new tickets? This is not really something im overly familiar with (I usually make mods) but it doesn't seem overly difficult. I just want some assistance in choosing the best approach.

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• How do I use the Silicon Laboratories IDE with SDCC?

  - by David Cary

  I'm thinking about using a microcontroller with an 8051 core from Silicon Laboratories. I hope that I can use C rather than assembly language, so I installed SDCC. I installed the "Silicon Laboratories IDE" to download the executable binaries to the on-chip Flash program memory. It also supposedly can be set up (under the Project Tool Chain Integration menu) to use "any" 8051 compiler. I tried to set it up to use SDCC, but every time I hit the "Assemble/Compile File" button it tells me "Compiler process did not sucessfully complete." How do I get new C code I write onto the SiLabs C8051F310 chip? Is there a web site with a step-by-step HOWTO? (Would it be easier to use a MAKEFILE that calls SDCC, only using the "Silicon Laboratories IDE" for the very last step of downloading the executable binary to the chip?)

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• Looking for the most painless non-RDBMS storage method in C#

  - by NateD

  I'm writing a simple program that will run entirely client-side. (Desktop programming? do people still do that?) and I need a simple way to store trivial amounts of data in a structured form, but really don't see any need to use a database system. What's more, some of the data needs to be serialized and passed around to different users, like some kind of "file" or perhaps a "document". (has anyone ever done that before?) So, I've looked at using .Net DataSets, LINQ, direct XML manipulation, and they all seem like they would get the job done, but I would like to know before I dive into any of them if there's one method that is generally regarded as easier to code than others. As I said, the amount of data to be stored is trivial, even if one hundred people all used the same machine we're not talking about more than 10 MB, so performance is not as large a concern as is codeability/maintainability. Thank you all in advance!

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• Efficient heaps in purely functional languages

  - by Kim

  As an exercise in Haskell, I'm trying to implement heapsort. The heap is usually implemented as an array in imperative languages, but this would be hugely inefficient in purely functional languages. So I've looked at binary heaps, but everything I found so far describes them from an imperative viewpoint and the algorithms presented are hard to translate to a functional setting. How to efficiently implement a heap in a purely functional language such as Haskell? Edit: By efficient I mean it should still be in O(n*log n), but it doesn't have to beat a C program. Also, I'd like to use purely functional programming. What else would be the point of doing it in Haskell?

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