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• Constructor within a constructor

  - by Chiramisu

  Is this a bad idea? Does calling a generic private constructor within a public constructor create multiple instances, or is this a valid way of initializing class variables? Private Class MyClass Dim _msg As String Sub New(ByVal name As String) Me.New() 'Do stuff End Sub Sub New(ByVal name As String, ByVal age As Integer) Me.New() 'Do stuff End Sub Private Sub New() 'Initializer constructor Me._msg = "Hello StackOverflow" 'Initialize other variables End Sub End Class

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• How do you make cin typesafe?

  - by cactusbin

  It is well known that cin is not typesafe (e.g. cin integer; and entering "fifty five" will cause it to flip out). I have seen many not-so-elegant ways to hand this, such as getlining a string and using sstream to convert it to a number, or looping with cin.fail() and clearing the stream and reentering it, etc. Is there any library or anyway to overload the inserter operator to make cin automatically typesafe?

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• Import? Initialize? what do to?

  - by Jeremy B

  I'm working on homework and I'm close but I am having an issue. I just learned how to work with packages in eclipse so I have a class that is importing another class from a package (I think I said that right) The main prompts the user to enter an integer between -100 and 100 and I am having an issue with validating it. I know the issue is where I'm importing I'm just unsure the direction I need to go to fix it. This is a section of my main code. (my issue starts with the last couple lines if you want to skip ahead) import myUtils.util.Console; public class ConsoleTestApp { public static void main(String args[]) { // create the Console object Console c = new Console(); // display a welcome message c.println("Welcome to the Console Tester application"); c.println(); // int c.println("Int Test"); int i = c.getIntWithinRange("Enter an integer between -100 and 100: ", -101, 101); c.println(); I have a class called Console that is located in another package that I believe I have properly imported. here is the code I am stuck on in my console class. public int getIntWithinRange(String prompt, int min, int max) { int i = 0; boolean isValid = false; while (isValid == false) { System.out.println(prompt); if (sc.hasNextInt()) { //if user chooses menu option less than 1 the program will print an error message i = sc.nextInt(); if (i < min) { System.out.println("Error! Please enter an int greater than -100"); } else if (i > max) { System.out.println("Error! Please enter an int less than 100"); } else isValid = true; } else System.out.println("Error! Invalid number value"); sc.nextLine(); } // return the int return i; } when I run this I keep getting my last print which is an invalid number value. am I not importing the code from the main method in the other console properly?

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• storing in unsigned char array

  - by javierkeung

  Hello everyone, i got a question about unsigned char array. How can i store an integer in the array continually? thanks for your help!

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• How to Create Own HashMap in Java?

  - by Taranfx

  I know about hashing algorithm and hashCode() to convert "key" into an equivalent integer (using some mathematically random expression) that is then compressed and stored into buckets. But can someone point me to an implementation or at least data structure that should be used as baseline? I haven't found it anywhere on the web.

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• SQL: how to get the left 3 numbers from an int

  - by dmr

  I want to retrieve the left 3 numbers from an integer to be stored in a table. For example, if the int is 1234567, I want to retrieve 123. I want the second number (123) to also be an int; I don't want to convert anything to a string. (And yes, really I should be working with strings. But I don't have control over that aspect of the issue.) Thank you!

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• Delphi Unit local variables - how to make each instance unique?

  - by Justin

  Ok, this, I'm sure is something simple that is easy to do. The problem : I've inherited scary spaghetti code and am slowly trying to better it when new features need adding - generally when a refactor makes adding the new feature neater. I've got a bunch of code I'm packing into a single unit which, in different places in the application, controls the same physical thing in the outside world. The control appears in several places in the application and operates slightly differently in each instance. What I've done is to create a unit with all of the features I need which I can simply drop, as a frame, into each form that requires it. Each form then uses the unit's interface methods to customise the behaviour for each instance. The problem within the problem : In the unit in question (the frame) I have a variable declared in the IMPLEMENTATION section - local to the unit. I also have a procedure, declared in the TYPE section which takes an argument and assigns that argument to the local variable in question - each form passes a unique variable to each instance of the frame/unit. What I want it to do is for each instance of the frame to keep its own version of that variable, different from the others, and use that to define how it operates. What seems to be happening, however, is that all instances are using the same value, even if I explicitly pass each instance a different variable. ie: Unit FlexibleUnit; interface uses //the uses stuff type TFlexibleUnit=class(TFrame) //declarations including procedure makeThisInstanceX(passMeTheVar:integer); private // public // end; implementation uses //the uses var myLocalVar; procedure makeThisInstanceX(passMeTheVar:integer); begin myLocalVar:=passMeTheVar; end; //other procedures using myLocalVar //etc to the end; Now somewhere in another Form I've dropped this Frame onto the Design pane, sometimes two of these frames on one Form, and have it declared in the proper places, etc. Each is unique in that : ThisFlexibleUnit : TFlexibleUnit; ThatFlexibleUnit : TFlexibleUnit; and when I do a: ThisFlexibleUnit.makeThisInstanceX(var1); //want to behave in way "var1" ThatFlexibleUnit.makeThisInstanceX(var2); //want to behave in way "var2" it seems that they both share the same variable "myLocalVar". Am I doing this wrong, in principle? If this is the correct method then it's a matter of debugging what I have (which is too huge to post) but if this is not correct in principle then is there a way to do what I am suggesting? Thanks in advance, Stack Overflow - you guys (and gals!) are legendary.

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• Paste a multi-line Java String in Eclipse

  - by Thilo

  Unfortunately, Java has no syntax for multi-line string literals. No problem if the IDE makes it easy to work with constructs like String x = "CREATE TABLE TEST ( \n" + "A INTEGER NOT NULL PRIMARY KEY, \n" ... What is the fastest way to paste a multi-line String from the clipboard into Java source using Eclipse (in a way that it automagically creates code like the above).

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• How change Castor mapping to remove "xmlns:xsi" and "xsi:type" attributes from element in XML output

  - by Derek Mahar

  How do I change the Castor mapping <?xml version="1.0"?> <!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN" "http://castor.org/mapping.dtd"> <mapping> <class name="java.util.ArrayList" auto-complete="true"> <map-to xml="ArrayList" /> </class> <class name="com.db.spgit.abstrack.ws.response.UserResponse"> <map-to xml="UserResponse" /> <field name="id" type="java.lang.String"> <bind-xml name="id" node="element" /> </field> <field name="deleted" type="boolean"> <bind-xml name="deleted" node="element" /> </field> <field name="name" type="java.lang.String"> <bind-xml name="name" node="element" /> </field> <field name="typeId" type="java.lang.Integer"> <bind-xml name="typeId" node="element" /> </field> <field name="regionId" type="java.lang.Integer"> <bind-xml name="regionId" node="element" /> </field> <field name="regionName" type="java.lang.String"> <bind-xml name="regionName" node="element" /> </field> </class> </mapping> to suppress the xmlns:xsi and xsi:type attributes in the element of the XML output? For example, instead of the output XML <?xml version="1.0" encoding="UTF-8"?> <ArrayList> <UserResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="UserResponse"> <name>Tester</name> <typeId>1</typeId> <regionId>2</regionId> <regionName>US</regionName> </UserResponse> </ArrayList> I'd prefer <?xml version="1.0" encoding="UTF-8"?> <ArrayList> <UserResponse> <name>Tester</name> <typeId>1</typeId> <regionId>2</regionId> <regionName>US</regionName> </UserResponse> </ArrayList> such that the element name implies the xsi:type.

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• Representing data as charts in Java.

  - by rgksugan

  I have three integer values. I need to represent these data as a chart. What should i do. Will iReports be the right option. If so give some pointers to tutorials for the IReports.

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• What database field should this be?

  - by alex

  I have a table called "Event". A column has "duration"--which is...how long that event lasts. What database type should this be? Integer? (in seconds)? In the future, I will do statements such as: If now() > event.duration THEN don't display the event.

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• generic Mysql stored procedure

  - by psu

  Hi, I have the fallowing stored procedure: CREATE PROCEDURE `get`(IN tb VARCHAR(50), IN id INTEGER) BEGIN SELECT * FROM tb WHERE Indx = id; END// When I call get(user,1) I get the following: ERROR 1054 (42S22): Unknown column 'user' in 'field list'

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• segmentation fault for the simplest program??

  - by capex

  Hi, I am just starting out, but this piece of code is giving me a 'segmentation fault' and I can't find out what's wrong with it: #include<stdio.h> int main (void) { int number = 0; int lastDigit = 0; printf("Enter an integer: "); scanf("%d", number); number = number*10; printf("Number times ten is %d.\n", number); return 0; }

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• Dynamically create textbox

  - by comii

  I need to dynamically create textbox. This is my code, but with this I create only one textbox: Public Sub CreateTextBox() Dim I As Integer Dim niz As Array For I = 1 To 5 Dim myTextBox = New TextBox myTextBox.Text = "Control Number:" & I Me.Controls.Add(myTextBox) Next End Sub So how i can dynamically create textbox? Thanks!

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• Creating a unique URL safe hash

  - by Ben Foster

  I want to hash/encode a unique integer (database ID) to create a similarly unique string. It needs to meet the following requirements: Must start with a letter or number, and can contain only letters and numbers. All letters in a container name must be lowercase. Must be from 3 through 63 characters long (although the shorter the better) The result does not need to be reversible, just repeatable - so a 1-way hash would be fine.

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• Getting following warning while compiling

  - by thetna

  warning: passing argument 1 of 'bsearch' makes pointer from integer without a cast and the corresponding code is Parent =bsearch((const size_t)ParentNum, ClauseVector, Size, sizeof(CLAUSE),pcheck_CompareNumberAndClause); the compilar is gcc. here CLAUSE is defined as *CLAUSE.

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• Performance Problem with Clojure Array

  - by dbyrne

  This piece of code is very slow. Execution from the slime-repl on my netbook takes a couple minutes. Am I doing something wrong? (def test-array (make-array Integer/TYPE 400 400 3)) (doseq [x (range 400), y (range 400), z (range 3)] (aset test-array x y z 0))

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• How to generate a transaction number?

  - by 001

  I was thinking of formatting it like this TYYYYMMDDNNNNNNNNNNX (1 character + 19 digits) Where T is type YYYY is year MM is month DD is day N is sequencial number X is check digit The problem is, how do I generate the sequencial number? since my primary key is not an auto increment integer value, if it was i would use that, but its not. EDIT can I have the sequencial number resets itself after 1 day (24hours). P201012080000000001X <-- first transaction of 2010/12/08 P2010120810000000002X <--- second transaction of 2010/12/08 P201012090000000001X <--- First transaction of 2010/12/09 (X is the check digit)

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• How to insert a SQLite record with a datetime set to 'now' in Android application?

  - by droidguy

  Say, we have a table created as: create table notes (_id integer primary key autoincrement, created_date date) To insert a record, I'd use ContentValues initialValues = new ContentValues(); initialValues.put("date_created", ""); long rowId = mDb.insert(DATABASE_TABLE, null, initialValues); But how to set the date_created column to "now"? To make it clear, the initialValues.put("date_created", "datetime('now')"); Is not the right solution. It just sets the column to "datetime('now')" text.

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• TCP sequence number question

  - by Meta

  This is more of a theoretical question than an actual problem I have. If I understand correctly, the sequence number in the TCP header of a packet is the index of the first byte in the packet in the whole stream, correct? If that is the case, since the sequence number is an unsigned 32-bit integer, then what happens after more than FFFFFFFF = 4294967295 bytes are transferred? Will the sequence number wrap around, or will the sender send a SYN packet to restart at 0?

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• How to get LSB bit in MIPS?

  - by israkir

  Is there a short way to check/get for least significant bit in a 32-bit integer, in MIPS? It is obviously set for the odd numbers and an algorithm which checks for the whole number is odd or even can decide for this. But I just wonder is there a better way to do this...

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• Create a dynamic control and AddHandle WITH Values/Brackets

  - by Jacob Kofoed

  Hi, it seems that adding for example a button Dim myButton as New Button and then addHandler to mySub("lol", 255) is not possible. Where mySub is Shared Sub MySub(byRef myString as string, myInteger as Integer) So: addHandler myButton.click, addressOf mySub("lol", 255) - returns an error saying it does not work with parentheses or whatever. I somehow see why this might not be possible, so I'm looking for a work-around on this problem. Please help _jakeCake

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• how to access cck checkbox value from views .tpl

  - by romandor

  Subject for advanced views theming: 1) Create CCK integer field "field_checkbox" - Single on/of checkbox Allowed values 0|No 1|Yes 2) In views row-style .tpl <?php print $fields['field_checkbox_value']->content ?> doesn't print any value, why? Other fields output fine. Thank you in advance!

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• How do I create a table in SQLite using the VS2008 Server Explorer

  - by fishhead

  Hello, I would like to create a table in a SQLite database using the Server Explorer in VS2008. I am able to do other operations on the database but when it comes to creating a table using the query builder I get Not Supported messages. is there another way other than writing code just for the sole purpose of creating the table? CREATE TABLE myTable ( ID INTEGER PRIMARY KEY AUTOINCREMENT, Name VARCHAR(100) ) .NET Framework Data Provider for SQLite 3.6.16

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• VB.NET Get Assembly Version information

  - by Berlioz

  How do I get my .NET Winforms app 2.0 to automatically update it's publish revision integer subsequent to issuing the publish command from within VS08. Trying to use the following C# as a guide object[] attrs = System.Reflection.Assembly.GetEntryAssembly().GetCustomAttributes(true); foreach (object o in attrs) if (o.GetType() == typeof(System.Reflection.AssemblyFileVersionAttribute)) label1.Text = ((System.Reflection.AssemblyFileVersionAttribute) o).Version;

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