Question: Why would a call to a virtual function execute slower than a call to a non-virtual function? Answer: Because the call is resolved through an additional level of indirection?instead

Question: I’m surprised the following code doesn’t compile: class C1{public: virtual void f() { /* … */ } void f(bool) { /* … */ }};class C2 : public C1{public: void

Question: I have a function halfway through a program, which should allow the user to quit the program, at the moment it just carries on to the next function call.

Question: How do I set up my Outlook 2000 client to autopopulate the user name and domain name in the Enter Password dialog box during startup? Answer: The best way

Question: When I start the Onmonitor program and run Status, I receive the message, “Unable to attach to shared memory.” But I have Informix 7.23 for AIX! What’s going on?

Question: I am trying to create a client e-mail listing to go out to all our company clients. What would be the easiest way to do this? Answer: The easiest

Question: I have seen a few tips regarding opening a Web browser using the Run command or using the ShellExecuteA external command. If I want to open multiple pages one

Question: How do you get C++ to run an outside program? How do you type this in the source code? Answer: You can invoke another executable from your programming by

Question: When using PowerBuilder as a front end for doing SQL queries, I get the following pop-up message when I look for someone with a single quote in their name

Question: I am currently writing a generic system where user object names are stored in a database and instantiated upon request. This is currently working beautifully, but I fall short

Question: What is the standard rule on access specifiers associated with superclasses? Old C++ compilers would not allow protected superclasses. But, the book I’ve read about OOAD allows it. Example:

Question: Is there a compatibility problem between users with Exchange 4.0 as their home server and users with Exchange 5.5 as their home server? As a user who has Exchange

Question: What does “Today – @sub” equate to in Oracle and what does it mean? Answer: It doesn’t look like anything in Informix, and I couldn’t find any reference on

‘ Convert a number into its textual equivalent.’ ‘ Pass True in the second argument if you want a null string when ‘ zero is passed.’ This is a recursive

‘ The Soundex code of an alphabetical string” you can use Soundex code for phonetic searches’ Beware: this isn’t bullet-proof!” UPDATE: this version corrects a bug in the original routine’

‘ Strip all extended ASCII characters’ (that is, all characters whose ASCII code is > 127)’Function StripExtendedASCII(source As String) As String Dim index As Long Dim bytes() As Byte ‘

‘ Return the next occurrence of a whole wordFunction InstrWord(start, Text, search, compareMethod) As Long Dim index As Long Dim charcode As Integer ‘ assume the search fails InstrWord =

‘ Replace a whole wordFunction ReplaceWord(Source As String, Find As String, ReplaceStr As String, _ Optional ByVal Start As Long = 1, Optional Count As Long = -1, _ Optional

If you execute a SQL statement in a stored procedure after your use the RAISERROR command, you will clear @@ERROR. This is true even if you use a RETURN and

Beginners are sometimes stymied when they get error messages on code that works perfectly elsewhere. For example, this code produces the error message, “Cannot use parentheses when calling a Sub”:

I often go to a site, scroll to the bottom, and see when it was last modified. If it says “March 1, 1825” then I am usually not so confident

Question: I want to create a three-tier application that has a browser front end and a Visual Basic middle-tier. How do I access my VB code from ASP? Should I

Question: We have an ASP page that displays product information from a database. We also have a button to download/view a related PDF file that should only appear on the

Question: I have data (text + CR + LF) stored in SQL Server 6.5 as a TEXT data type. When I want to display the data on an ASP page,

import java.util.*;import java.io.*;class Class1 { static Vector split(String string,String delimiter) { //StringTokenizer that works with empty strings boolean wasDelimiter=true; String token=null; Vector vector=new Vector(); if(string!=null) for(StringTokenizer stringTokenizer=new StringTokenizer(string,delimiter,true);stringTokenizer.hasMoreTokens();) { if((token=stringTokenizer.nextToken()).equals(delimiter))

The JComboBox API provides a programmer with very little directcontrol over how list items are displayed. This is because, in trueobject-oriented fashion, a JComboBox object knows or cares very littleabout

This tip is probably cosmetic, but it could result in great convenience. Doing a [import java.package.*] would allow usage of [public] classes in theaforementioned package without the usual required verbosity.

At times you want to output the numeric values in specific format, for example, you may want to display monetary value with two decimal points, or scientific data with five