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Understanding VBA Functions and Their Uses

A function performs a calculation and returns a single value. The SUM function adds the sum of a range of values. The same holds true for functions used in your VBA expressions: Each function does its [more…]

JavaScript and HTML

You can think of JavaScript as an extension to HTML; an add-on, if you will.

Here's how it works. HTML tags create objects; JavaScript lets you manipulate those objects. For example, you use the HTML <BODY> [more…]

Opening, Closing, and Hiding Forms with Visual Basic .NET

Having multiple forms as part of your Visual Basic .NET program may be nice, but when your Visual Basic .NET program runs, it normally displays one form. To make the other forms of your program appear [more…]

Building Your First DataSet in Visual Basic .NET

A DataSet can contain all the basic elements of a database: tables, keys, indexes, and even relations between tables. So by creating a DataSet, you'll be discovering the structure of a database at the [more…]

An Introduction to C++

The C++ programming language consists of a vocabulary of commands that humans can understand and that can be converted into machine language fairly easily and a language structure [more…]

Designing Video Games

A video game is more than the sum of its pieces; a game has a synergy that, after the game is complete, makes it something unique. Creating this synergy takes a lot of technical know-how, as well as a [more…]

Expressing Binary Numbers in C++

C++ variables are stored internally as so-called binary numbers. Binary numbers are stored as a sequence of 1 and 0 values known as bits. Most of the time, you don't really need to deal with numbers at [more…]

Working with Functions in C++

Developers often need the ability to break programs up into smaller chunks that are easier to develop. "Real world" programs can be many of thousands (or millions!) of lines long. Without this ability [more…]

Downloading and Installing the Java Development Kit (JDK)

First you need some Java development software. You can choose from several products. In fact, you may already have one of these products on your own computer. If you don't, you can download the basic software [more…]

Declaring Variables in C

Variables are what make your programs zoom. Programming just can't get done without them. So if you haven't been introduced to variables yet, here you go. [more…]

Getting Started with Java Programming

The late 1980s saw several advances in software development, and by the early 1990s, many large programming projects were being written from prefab components. Java came along in 1995, so it was natural [more…]

Writing a WebLogic Startup Script

One of the most common ways to start WebLogic Server is by using a startup script. A startup script is nothing more than an ordered list of commands that would normally be issued at the Windows or UNIX [more…]

Tackling Error Messages in Java Programming

Sometimes, error messages can strike fear into the heart of even the bravest programmer. Fortunately some helpful, calming advice is here — advice to help you solve the problem when you see one of these [more…]

Creating Web Services in WebLogic

A web service is a remote procedure available to clients through TCP/IP, typically using HTTP or SMTP as the transport and XML for encoding. The web service is described using standard XML notation called [more…]

Four Steps to Take before Writing a Computer Program

Before you start writing a computer program, first take four critical steps to design it. By doing so, you don't waste time writing a computer program that doesn't work or that solves the wrong problem [more…]

Understanding PHP Data Types

Variables can store data of different types, and different types of data can do different things. For example, you can add variables whose values are numbers [more…]

Understanding Data Types in Visual Basic .NET

Variables are essential to computer programming, just as they are in many other aspects of life. Any container with a label is the real-world equivalent of a variable. And you're surrounded by named containers [more…]

Getting a Look At Web Services

Web services promise to be the next major frontier in computing. Up until the advent of Web services, interoperability and integration (the exchange of data among computer systems) were extremely limited [more…]

Meeting the Tools in the Visual Basic Toolbox

When you write a Visual Basic program, you first have to design the user interface. Essentially, a Visual Basic user interface consists of objects that you place on the screen and arrange in some semblance [more…]

Working with Code in Visual Basic 2008

Of the programs you create with Visual Studio, most of what you want the user to see are the controls and the forms. But you will be spending most of your time working with code. Fortunately, Visual Studio [more…]

Understanding C#'s "If" Statement

The basis of all C# decision-making capability is the ifstatement, as follows:

if (bool-expression)
// Control goes here if the expression is true.
// Control passes to this statement whether the expression [more…]

How Does a Computer Program Work?

Computers don't do anything without someone telling them what to do, much like the average teenager. To make the computer do something useful, you must give it instructions in either of the following two [more…]

Looking at the C Language

Each program must have a starting point. When you run a program, DOS sends it off on its way — like launching a ship. As its last dock-master duty, DOS hurls the microprocessor headlong into the program [more…]

Java Programming: Telling the Computer to Do Something

In Listing 1, below, you get a blast of Java code. Like all novice programmers, you're expected to gawk humbly at the code. But don't be intimidated. When you get the hang of it, programming is pretty [more…]

Contrasting Single and Double Quotes in Perl

To summarize the main difference between single and double quotation marks: Single quotation marks do not interpret, and double quotation marks do. That is, if you put something in single quotation marks [more…]

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