Data Types and Variables in VB.NET

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Data Types and Variables
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Take my data...please! Ha, ha, that one always cracks me up. But it s actually what I ask my Visual Basic application to do: take data from some source (keyboard, hard disk, Internet, etc.) and present it in some useful way. All programs I write will actively manage at least some data in memory. Each data value is stored in a specific area of the computer s memory, as determined by the Common Language Runtime (CLR). The statements in Visual Basic exist primarily to manage and manipulate this data in useful and complex ways. All data managed by the CLR is stored in the computer s memory, with each data value separated and protected from all others. It s as though each data value had its own individual teacup, as in Figure 2-1.
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Data Types and Variables |
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All data values managed by the CLR have content and type. Content is the actual data: the text string abc, the number 5, a sales invoice, orange pekoe. Whatever you put in the teacup, that s the content. In some cases, .NET allows you to store absolutely nothing in the teacup (for reference types as described shortly, or nullable value types as described in 6). Type indicates the kind of content stored in the teacup. In Figure 2-1, this is shown by the shape of each teacup. Each teacup has limits on the type of data that can be poured into the teacup: a text string, an integer number, a customer invoice.
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Literals
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Some basic data values, such as numbers and text strings, can be entered into your source code and used just as they are. For instance, the MsgBox procedure displays a window with a supplied text message. The statement:
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MsgBox("The answer is " & 42)
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includes a literal string, The answer is, and a literal integer value, 42. (The & symbol is an operator that connects two values together into a new string.) Literals are used once, and then they re gone. If I wanted to show the same The answer is 42 message again, I would have to once again type the same literal values into a different part of the source code. Visual Basic supports several types of basic literals. String literals are always surrounded by quote marks. If you want to include a quote mark itself in the middle of a string, include two instead of one:
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"This is ""literally"" an example."
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String literals can be really, really long, up to about 2 billion characters in length; if you were to type just one character per second, it would take more than 63 years to reach the maximum string length. Visual Basic also includes a character literal that is exactly one character in length; if you were to type just one character per second, well, never mind. These character literals are recognized by the c trailing after the string. The character literal A is entered as:
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"A"c
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2: Introducing Visual Basic
Date and time literals are surrounded by number signs instead of quote marks. The date or time (or both) that you include can be in any format recognized by Microsoft Windows in your specific region. If you are using Visual Studio, it will reformat your date when you type in the literal:
#7/4/1776#
Eleven different kinds of numeric data values both integers and floating-point values make up the core set of numeric teacups. And who needs more than 11 With these 11 teacups, you can manage numbers from zero all the way to 1 10300 and beyond. To use a numeric literal, type the number right in your code, like 27, or 3.1415926535. Visual Basic also lets you specify which of the 11 numeric teacups to use for a number, by appending a special character to the end of the number. Normally, 27 is an integer 27. To make it a currency-focused decimal, append an at sign (@):
27@
When I talk about data types in full detail in 6, I will list the different special characters, like @, that set the data type for literal numbers. The fourth and final type of Visual Basic literal is the Boolean literal. Boolean values represent the simplest type of computer data: the bit. Boolean values are either true or false, on or off, yes or no, delicious or disgusting, cats or dogs, zero or nonzero. Booleans always represent any two opposite values or states. Back in the 1800s, George Boole invented Boolean algebra, a language he used to represent logic statements as mathematical equations. It just so happens that computers love Boolean algebra. All the basic operations of a computer, such as addition, are implemented using Boolean functionality. Visual Basic includes the Boolean literals True and False. No quotes; no number signs just the words True and False. Question: is Tim Patrick telling the truth about this Answer:
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