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  • Does any language have a while-else flow structure?

    - by dotancohen
    Consider this flow structure which I happen to use often: if ( hasPosts() ) { while ( hasPosts() ) { displayNextPost(); } } else { displayNoPostsContent(); } Are there any programming languages which have an optional else clause for while, which is to be run if the while loop is never entered? Thus, the code above would become: while ( hasPosts() ) { displayNextPost(); } else { displayNoPostsContent(); } I find it interesting that many languages have the do-while construct (run the while code once before checking the condition) yet I have never seen while-else addressed. There is precedent for running an N block of code based on what was run in N-1 block, such as the try-catch construct. I wasn't sure whether to post here or on programmers.SE. If this question is more appropriate there, then please move it. Thanks.

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  • Iterating multple lists consecutively (C++)

    - by Graham Rogers
    I have 3 classes, 2 inheriting from the other like so: class A { public: virtual void foo() {cout << "I am A!" << endl;} }; class B : public A { public: void foo() {cout << "B pretending to be A." << endl} void onlyBFoo() {cout << "I am B!" << endl} }; class C : public A { public: void foo() {cout << "C pretending to be A." << endl} void onlyCFoo() {cout << "I am C!" << endl} }; What I want to do is something like this: list<A> list_of_A; list<B> list_of_B; list<C> list_of_C; //put three of each class in their respective list for (list<B>::iterator it = list_of_B.begin(); it != list_of_B.end(); ++it) { (*it).onlyBFoo(); } for (list<C>::iterator it = list_of_C.begin(); it != list_of_C.end(); ++it) { (*it).foo(); } //This part I am not sure about for (list<A>::iterator it = list_of_all.begin(); it != list_of_all.end(); ++it) { (*it).foo(); } To output: I am B! I am B! I am B! I am C! I am C! I am C! I am A! I am A! I am A! B pretending to be A. B pretending to be A. B pretending to be A. C pretending to be A. C pretending to be A. C pretending to be A. Basically, sometimes I want to only loop the Bs and Cs so that I can use their methods, but sometimes I want to loop all of them so that I can use the same method from each i.e. iterate the As, then the Bs, then the Cs all in one loop. I thought of creating a separate list (like the code above) containing everything, but it would create lots of unnecessary maintenance, as I will be adding and removing every object from 2 lists instead of one.

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  • Best way to move a bunch of SQL Server 2005 tables to another Server?

    - by Mikecancook
    I've been looking for a way to move a bunch of tables, more than 40, to another server with all the data in them. I've looked around for scripts to generate inserts but so far I'd have to run them once for every table, then copy all the scripts over and then run them on the server. Seems like there is a better way. --Update-- My strategy for doing this may have been for naught. The end script, using MS SQL Server Publishing Wizard and Red Gates SQL Data Compare (excellent tool, btw) results in a file over 1GB. This makes my system plead for mercy and I'm not willing to risk crashing a clients server just opening the file to run it. I may have to rethink this whole thing and break down to just individual per table scripts. I'm not looking forward to that.

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  • Write/read count to txt file

    - by Brian
    Hi, I need a batch file that writes the count number to a txt file. Next time the batch file is run, it should read the current count number from the txt file and add 1 to count and save this new value in the txt file. (nothing else is in the txt file) When count is 5 it should start from 1 again Example: Count.bat runs 1 time: count.txt has no count so Count.bat saves the value 1 in count.txt Count.bat is run 2 time: Count.bat reads 1 from count.txt and saves the new value 2 to count.txt When count.bat is run for the 6 time it should start over by saving the value 1 in count.txt I think this just be easy to do, but I'am not use to batch commands So hopefully someone here could help me.

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  • callin' c from lua crashes while reallocating

    - by mkind
    hi folks, i got a crazy error within that for-loop matr=realloc(matr, newmax*sizeof(matr*)); for (i=0; i<newmax; i++){ matr[i]=realloc(matr[i], newmax*sizeof(int)); } matr is a multi-dimension array: int **matr. i need to resize column and row. first line resizes column and the for-loop resizes every row. it worked fine in c. now im working on a library for lua and it crashs here. compilin' works fine as well. but calling from lua crashs with lua: malloc.c:3552: mremap_chunk: Assertion `((size + offset) & (mp_.pagesize-1)) == 0' failed. i have no damn idea since it's working fine using it in c.

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  • Why this search can not generate correct result?

    - by user482742
    Hi, All: Below is to find same customer and if he is in list, the number add one. If he is not in the list, just add him in the list. I use Search function to do this, but failed and generated incorrect records. It can not find the customer or the right number of customers. But if I use For..loop to iterate the list, it does well and can find the customer and add new customer in that for..loop search procedure. (I did not paste for ..loop search procedrue here). Another problem is that there is no difference between setting list.sorted true and false. It seems Search function is not correct. This search function is from an example of delphi textbook. The below is with Delphi 7. Thank you. Procedure Form1.create; begin list:=Tstringlist.create; list.sorted:=true; // Search function will generate exactly Same and Incorrect //records no matter list.sorted is set true or false. list.duplicates:=dupignore; .. end; Procedure addcustomer; var .. begin while p1.MatchAgain do begin //p1 is regular expression customer:=p1.MatchedExpression; if (search(customer)=false) then begin list.Add(customer+'=1'); end; allcustomer:=allcustomer+1; .. end; Function Tform1.search(customer: string): boolean; var fre:string; num:integer; L:integer; R:integer; M: Integer; CompareResult: Integer; found: boolean; begin result:=false; found:=false; L := 0; R := List.Count - 1; while (L <= R) and ( not found ) do begin M := (L + R) div 2; CompareResult := Comparetext(list.Names[m]), customer); if (compareresult=0) then begin fre:=list.ValueFromIndex [m]; num:=strtoint(fre); num:=num+1; list.ValueFromIndex[m]:=inttostr(num); Found := True; Result := true; exit; end else if compareresult > 0 then r := m - 1 else l := m + 1; end; end;

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  • How to read line after finding a pattern?

    - by Jonathan Low
    i've got a "CHANNEL(SYSTEM.DEF.SVRCONN) CHLTYPE(SVRCONN)" "id=3" what i want to do is to retrieve the id after i do a search on the file and found the first line. open (CHECKFILE8, "$file"); while (<CHECKFILE8>) #while loop to loop through each line in the file { chomp; #take out each line by line $datavalue = $_; #store into var , $datavalue. $datavalue =~ s/^\s+//; #Remove multiple spaces and change to 1 space from the front $datavalue =~ s/\s+$//; #Remove multiple spaces and change to 1 space from the back $datavalue =~ s/[ \t]+/ /g; #remove multiple "tabs" and replace with 1 space if($datavalue eq "CHANNEL(SYSTEM.DEF.SVRCONN) CHLTYPE(SVRCONN)") { // HOW TO READ THE NEXT LINE? } } } close(CHECKFILE8); } Thanks

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  • LINQ Queries And Context

    - by Soo
    Hello SO, I have a slight issue with some code I'm writing if(parameter == 1) { var linq = from a in db.table select a; } else { var linq = from a in db.table where a.id = 1 select a; } foreach(var b in linq) { ... } So basically what's going on is that the variable "linq" is different depending on the value of "parameter". When I try to loop through "linq" with my foreach loop, I get an error about how linq doesn't exist in the current context. What is the best way to work around this type of issue?

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  • having problems in running my java program..

    - by Tarun
    I'm a beginner in java so this question might seem a little stupid, my jdk and jre are installed in C:\program files, I write my program and save it in in my folder G:\start, now my program compiles without any error(the .class file is also generated), but when i run my program it says "unable to locate G:\lib\amd64\jvm.cfg", so i copy the 'lib' folder from my jdk folder and paste it in G:, again program compiles without any error, but when i run it,it gives my a new error saying "unable to locate G:\bin\server\jvm.dll",so i copy the 'bin' folder to g:, but now when i run, it gives me the same error again "unable to locate G:\bin\server\jvm.dll",where am I going wrong?

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  • JUnit unable to find tests in Eclipse

    - by mikera
    I have a strange issue with JUnit 4 tests in Eclipse 3.5 that I couldn't solve - any hints gratefully received! Initially: I had a test suite working properly, with 100+ tests all configured with JUnit 4 annotations. I'd run these typically by right clicking on my source folder and selecting "Run as JUnit test". All worked perfectly. Now: When I try to run the test messages all I get is an error "No tests found with test runner 'JUnit 4'". Any idea what is happening? I simply can't work out what could have changed to make this fail. My guess is that it is some configuration issue based on the build path or class path?

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  • How to go through every record in sqllite db?

    - by Pavel
    Hi guys. I think it's kinda easy one but still I'm new to android programming so please have patience. I want to know how can I get the number of records (rows) in a specific table in my db. I need this so I can create a loop to go through every record and add each one of it to the specific Array and display it later on. This is the source: db.openDataBase(); // open connection with db Cursor c = db.getTitle(5); // loop here through db, right now I'm fetching only one record startManagingCursor(c); //adding areas to the list here Area o1 = new Area(); o1.setOrderName(c.getString(1) + c.getString(2)); m_areas.add(o1); db.close(); Does anyone can help me with this please? Thx in advance!

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  • NOT LIKE not working on comparison to a column

    - by rodling
    Data is fairly large and takes few minutes to run it every time, so its taking a lot of time debugging this problem. When I run like concat('%',T.item,'%') on smaller data it seems to identify items properly. However, when I run it on the main DB (the code shown), it still shows many(maybe even all) of the exceptions. EDIT: it seems when i add NOT it stops identifying items select distinct T.comment from (select comment, source, item from data, non_informative where ticker != "O" and source != 7 and source != 6) as T where T.comment not like concat('%',T.item,'%') order by T.comment; comment and source are in data, item is in non_informative Some items from T.item: 'Stock Analysis -', '#InsideTrades', 'IIROC Trade' Example comment which should be removed '#InsideTrades #4 | MACNAB CRAIG (Director,Officer,Chief Executive Officer): Filed Form 4 for $NNN (NATIONAL RETA' Can't seem to figure out it why shows all the items

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  • How can I tell if a SQL Server database is being backed up

    - by Guy
    Is there a way to programmatically determine if a SQL Server backup is currently being performd on a particular database? We have automated database backup scripts for both data and log files, where the databases are backed up nightly and log files are backed up every 15 minutes, 24 hours a day. However, we think that the log file backup job is failing if it runs the same time as the full backup is being run. What I'd like to do is to make a change to my transaction log script to not run a transaction log backup while the full backup is being run. If there a DMV or a system table that I can query and work this out?

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  • How to check the compatibility between my program and the .net framework versions?

    - by Jack
    Hi all I am writing a program which is targeted to run on .net framework 2.0. I have chosen 2.0 in my VS project. It runs fine on my machine (mine has 2.0 SP2), so there is no compile error. but when I tried to run it on another machine (only with 2.0, no sp), it cannot run. I am aware that I used some method which is supported by 2.0 but only with 2.0 SP2. .net framework 2.0 SP2 seems not being listed in VS IDE, that's why VS cannot give me any warning when I compiled it on my machine. How can I easily check the compatibility of my codes with .net framework 2.0 SP2? or I just have to look at msdn to check every method I have used??? thanks

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  • Adding items to a files right click menu in Windows Explorer

    - by Fire Lancer
    What do I need to do to add an item to the right click menu for files with certain file extensions, along with sub menus? An example would be adding items to run Python files (.py, .pyw, .pyc) with a specific version of Python, so the menu for a .py files would look like say: Open 7-Zip > ...7zip stuff Run > Python 2.5 Python 2.6 Python 3.1 Edit > IDLE 2.5 IDLE 2.6 IDLE 3.1 various other items

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  • VB6 debugging- doesn't go to error handling code.

    - by Can Ho
    Hi, I'm maintaining a vb6 project(ActiveX DLL). When debugging, the app run into the following function: Public Function HasValue(ByVal vValue) As Boolean On Error GoTo Err If IsMissing(vValue) Then HasValue = False ElseIf IsNull(vValue) Or Len(vValue) = 0 Then HasValue = False ElseIf isEmpty(vValue) Then HasValue = False Else HasValue = True End If Exit Function Err: If IsArray(vValue) Or IsObject(vValue) Then HasValue = True Else HasValue = False End If End Function and it stops at the line ElseIf IsNull(vValue) Or Len(vValue) = 0 Then vValue is a custom object, contains some properties(obviously, not null). Although I didn't put any break point there, the app stopped there and alerted error dialog saying that "Run-time error '438': Object doesn't support this property or method". We had error handling code but the app didn't run to error handling code. It just stopped at the line causing the error and I had to stop the application. Do you have any idea about that? Thank you very much.

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  • Mac OS X 10.5 App "not supported on this architecture" cured by copying?

    - by JWWalker
    I have an app that updates itself over the internet, and the updated copy won't run on PowerPC machines (G5) running Leopard (10.5.8). Double-clicking the app produces a message saying "You can't open the application "appname" because it is not supported on this architecture." But here's the weird part: if I duplicate the app using the Finder or using a cp -R command, then the duplicate runs fine! And yet, if I do ls -laeR on both apps, the results are identical. I restarted the machine, and the difference between the two copies was still there. Sometimes, renaming the app made it run. After a few tries, I managed to rename it back to the original name and still have it run. If this was just on one machine, I'd dismiss it as disk corruption, cosmic rays, or a voodoo hex, but it was reported by a customer and then I reproduced it on my own machine. Any ideas what could cause this behavior?

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  • Oracle 10g multiple DELETE statements

    - by bmw0128
    I'm building a dml file that first deletes records that may be in the table, then inserts records. Example: DELETE from foo where field1='bar'; DELETE from foo where fields1='bazz'; INSERT ALL INTO foo(field1, field2) values ('bar', 'x') INTO foo(field1, field2) values ('bazz', 'y') SELECT * from DUAL; When I run the insert statement by itself, it runs fine. When I run the deletes, only the last delete runs. Also, it seems to be necessary to end the multiple insert with the select, is that so? If so, why is that necessary? In the past, when using MySQL, I could just list multiple delete and insert statements, all individually ending with a semicolon, and it would run fine.

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  • how to use a wav file in eclipse

    - by AlphaAndOmega
    I've been trying to add audio to a project I've been doing. I found some code on here for html that is also supposed to work with file but it keeps saying "Exception in thread "main" javax.sound.sampled.UnsupportedAudioFileException: could not get audio input stream from input file at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source) at LoopSound.main(LoopSound.java:15)" the code public class LoopSound { public static void main(String[] args) throws Throwable { File file = new File("c:\\Users\\rabidbun\\Pictures\\10177-m-001.wav"); Clip clip = AudioSystem.getClip(); // getAudioInputStream() also accepts a File or InputStream AudioInputStream wav = AudioSystem.getAudioInputStream( file ); clip.open(wav); // loop continuously clip.loop(-1000); SwingUtilities.invokeLater(new Runnable() { public void run() { // A GUI element to prevent the Clip's daemon Thread // from terminating at the end of the main() JOptionPane.showMessageDialog(null, "Close to exit!"); } }); } } What is wrong with the code?

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  • Enum : get the keys list

    - by Damien MATHIEU
    Hello, I'm not a java developer. But I'm currently taking a look at Android applications development so I'm doing a bit of nostalgy, doing some java again after not touching it for three years. I'm looking forward using the "google-api-translate-java" library. In which there is a Language class. It's an enum allowing to provide the language name and to get it's value for Google Translate. I can easily get all the values with : for (Language l : values()) { // Here I loop on one value } But what I'd want to get is a list of all the keys names (FRENCH, ENGLISH, ...). Is there something like a "keys()" method that'd allow me to loop through all the enum's keys ?

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  • Form submission and hyperlinks using GET and POST

    - by Jon
    I have a search resource, the user can perform searches by filling out a form and submitting it, the create action is called, the Search is saved, the show action is called, and the results are displayed. This all happens with the default POST, and all works fine. The user may want to save his search in the saved_search table (i don't use the Search table for this purpose as this table stores all searches for the purpose of compiling statistics, and gets cleared on a regular basis). Once the Search is saved, it can be re-run by clicking a hyperlink, this is where i start to get problems. I see no way of getting my hyperlink to run the create action of Search, with a POST request, and the necessary data. I then decided to try to get both form submission and the hyperlink to perform a search using a GET request, i was unable to get form_for to run my Search create action using a GET request, it always seems to get routed to my index action. Can someone suggest a good restful solution to this problem please. Many thanks

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  • Writing to CSV issue in Spyder

    - by 0003
    I am doing the Kaggle Titanic beginner contest. I generally work in Spyder IDE, but I came across a weird issue. The expected output is supposed to be 418 rows. When I run the script from terminal the output I get is 418 rows (as expected). When I run it in Spyder IDE the output is 408 rows not 418. When I re-run it in the current python process, it outputs the expected 418 rows. I posted a redacted portion of the code that has all of the relevant bits. Any ideas? import csv import numpy as np csvFile = open("/train.csv","ra") csvFile = csv.reader(csvFile) header = csvFile.next() testFile = open("/test.csv","ra") testFile = csv.reader(testFile) testHeader = testFile.next() writeFile = open("/gendermodelDebug.csv", "wb") writeFile = csv.writer(writeFile) count = 0 for row in testFile: if row[3] == 'male': do something to row writeFile.writerow(row) count += 1 elif row[3] == 'female': do something to row writeFile.writerow(row) count += 1 else: raise ValueError("Did not find a male or female in %s" % row)

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  • MySql returning multiple rows from stored procedure / function

    - by pistacchio
    Hi, I need to make a stored procedure or function that returns a set of rows. I've noted that in a stored procedure i can SELECT * FROM table with success. If i fetch rows in a loop and SELECT something, something_other FROM table once per loop execution, I only get one single result. What I need to do is looping, doing some calculations and returning a rowset. What's the best way to do this? A temporary table? Stored functions? Any help appreciated.

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  • Can you make desktop shortcuts to Seamless mode Windows apps in VirtualBox on OSX?

    - by Matt
    Running the latest version of VirtualBox on OSX and hosting a Windows virtual machine. Is there a way to put shortcuts on your Mac desktop for the Windows apps that you run in seamless mode? I can't find a way to do this, so every time I want to newly launch a Windows app in seamless mode I have to access the full Windows desktop, start the app and hit HostKey+L. Really a pain for apps that you want to run in seamless mode all time.

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