Exercise 36 in Visual Basic .NET

Making QR Code in Visual Basic .NET Exercise 36
Exercise 36
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Create a sequence of statements for each of the following situations a) b) Collect values from the console (ReadLine()) into three variables, a, b and c, and then calculate and display (WriteLine()) their average Ask the user to enter their name, address and telephone number (use ReadLine() and assign to the variables name, addr and tel), and then display these values in reverse order (use WriteLine()) Calculate and display the volume of a box, using variables Length, Width and Height for the dimensions of the box Ask the user to enter suitable values using a combination of Write() and ReadLine()
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Structured Variables
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All the variable types mentioned so far fall into the category of simple data types All simple data variables can store a single piece of data; one number, a piece of text, date or time In some cases, it may appear as if a simple variable was storing more than one piece of data (for example, a Date variable stores all the parts of a date and
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35 Structured Variables
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time Year, Month, Day, Hour, Minute and Second); however, this illusion is simply a facet of the ef cient way that a computer can work with information (a date is a single point in time and can be stored as such by storing the length of a time interval from some reference point in time the number of seconds that have elapsed since the start of this century, for example) When we need to store more than one piece of data, we have a choice; we can either use more than one variable as was done in Listing 32 to store the length and width of a single rectangle in two separate variables, or we can resort to a more complex variable type The rst of these options was once the only one available to programmers, but as programming languages have become more capable, it is now more normal to deal with multiple pieces of data which relate to a single thing (such as a rectangle) in a single variable Visual Basic and the underlying runtime system give us several ways of organizing groups of variables into coherent assemblies of data One option provided by the CLR is that we can create new variable types that can store more than a single value For example, we can de ne a new Rectangle type that is capable of storing both the Length and the Width of a rectangle in a single variable Using this, the code in Listing 32 can be rewritten to deal directly with rectangles:
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Structure Rectangle Dim Length As Single Dim Width As Single End Structure
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In VB NET, a Structure is a de nition of a new type of variable that can contain any number of component variables Once it has been de ned, variables of the new type can be declared and used in (almost) the same way as any of the existing types provided by the Common Type System Of course we need some way of indicating which component variable we want to refer to when we make assignments from simple variables or values, or when we wish to retrieve any of the component values individually VB provides a simple mechanism using the symbol (dot operator) for this purpose We can now use this new data type to replace the two separate length and width variables in the earlier program
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Module Module1 Structure Rectangle Dim Length As Single Dim Width As Single End Structure Sub Main() Dim myRectangle As Rectangle, area As Single myRectangleLength = 125 myRectangleWidth = 875 area = myRectangleLength * myRectangleWidth ConsoleWriteLine("Area is {0}", area) End Sub End Module Listing 36: Making use of the Rectangle type
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