Variables in Visual Basic .NET

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32 Variables
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computer program (in this case the multiplication) is often trivial compared to the way we need to wrap it up in program code to make it work VB NET provides us with a rich set of pre-de ned types of variable as the Common Type System We create and use variables of the supplied types using statements similar to those used in Listing 32 What we do with the variables depends on the job our program needs to do What we can do with them depends on which of the various types of variable we decide to use For example, we would store numbers in one of the numeric variable types (Single, Double, Decimal, Integer, Long), selecting the type most appropriate for the job required (high or low precision calculations, counting things, storing measurements, etc) We can also store text (using a String variable), dates (the Date type), the answers to Yes/No questions (Boolean variables) and other forms of data
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Exercise 31
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Write a short program similar to that in Listing 32, that will calculate the area of a circle of a given radius De ne the variables area and radius, and use the formula: area = 314 * radius * radius to perform the calculation
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321 Other Simple Variable Types
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VB NET provides us with a wide range of built in types of variable, as Table 31 shows Using the range of simple data types listed in the table, we can develop programs that can store and manipulate any type of information In some cases, we may need to be quite ingenious in the way that we use these types to represent some information For example, we can represent a colour as three numbers, each an indication of the intensity of one of the additive primary colours, red, blue and green, that would be mixed to form the actual colour Listing 33 shows some examples of various types in use in a program Note that lines that begin with a (single quote mark) are comments and are ignored by Visual Basic):
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Sub Main() Dim Name As String Dim DateOfBirth As Date Dim Gender As Char Dim Age As Integer Dim Height As Single Dim Response As String Dim LicencedDriver As Boolean ConsoleWriteLine("ALL ABOUT YOU") 'First ask for and read the user's name ConsoleWrite("Enter your name: ")
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Table 31
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3 n The Visual Basic NET Language
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Simple data types in Visual Basic
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Type Name Byte Short Integer Long Single
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Range
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0 to 255 32,768 to +32,767 2,147,483,648 to 2,147,483,647 9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 3402823E+38 to 1401298E 45 for negative values; 1401298E 45 to 3402823E+38 for positive values 179769313486231E+308 to 494065645841247E 324 for negative values; 494065645841247E 324 to 179769313486231E+308 for positive values +/ 79,228,162,514,264,337,593,543,950,335 with no decimal point; +/ 79228162514264337593543950335 with 28 places to the right of the decimal; smallest non-zero number is +/ 00000000000000000000000000001 True or False 0 to 65535
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Description
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A small number, equivalent to one unit of storage in computer memory A 16-bit signed number with no fractional part A 32-bit signed number with no fractional part A 64-bit signed number with no fractional part A single-precision oating-point number stored in an ef cient binary representation (7 digits of precision) A double-precision oating-point number stored in an ef cient binary representation (15 digits of precision) A high precision number stored in a direct decimal representation to improve the accuracy of calculations (29 digits of precision)
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Double
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Decimal
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Boolean Char
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Used to store simple true/false, on/off, up/down or other 2-state values Stores a single alphanumeric character (eg the letter x , or a digit or punctuation symbol) Sequences of text characters, eg names, addresses, paragraphs of a document, whole documents, etc Dates, times and combinations of both A single date variable stores a point in time (Date and Time)
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String
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Up to 2 billion characters
Date
January 1, 0001 to December 31, 9999
Name = ConsoleReadLine() 'Now their birth date ConsoleWrite("Enter your date of birth: ") DateOfBirth = ConsoleReadLine() 'Ask if male of female ConsoleWrite("Are you male (M) or female (F):") Response = ConsoleReadLine() 'Just in case convert the response to UPPER CASE Gender = ResponseToUpper() 'Ask and read user's height