language: VB.NET (mono-2.4.2.3)
date: 118 days 1 hour ago
link:
visibility: public 
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
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<meta name="author" content="kjell at ieee dot org ">
<meta name="copyright" content="2011">
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<title>Picture of an Object</title>
<link rel="stylesheet" type="text/css" href="../CAIstyleRev2.css">
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<h3>Answer:</h3>
<p>
A <em>von Neumann computer</em> uses general purpose memory to
store both programs and data.
</p>
 
 
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<!-- LESSON DIVISION -->
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<h1>Picture of an Object</h1>
<a name="von Neumann"></a>
<img src="objectPicture.gif" class="rightimage" alt="object as memory">
 
<div class="left">
 
<p>
In terms of object-oriented programming, a <b>von Neumann computer</b>
uses general purpose memory to store both the state and behavior of objects.
It is interesting that an idea from the 1940's is still important.
</p>
 
<p>
A software object consists of both variables (state information) and
methods (recipes  for behavior).
In the picture,
the yellow bricks represent bytes of memory out of
which the object is built.
This object has some variables, 
<code>location</code>, <code>color</code>,  and <code>size</code>,
and has some methods that control its behavior.
</p>
 
 
<p>
In object-oriented programming,
the programmer    uses a programming language (such as Java)
to describe various objects.
When the program is run (after being compiled)
the objects are created (out of main storage)
and they start "doing things" by running their methods.
</p>
 
<p>
The methods must execute in the correct order.
For an application, the first method to
run is the method named <code>main()</code>.
There should be only one  method named <code>main()</code>
in an application.
In a small application,
<code>main()</code> might do by itself all the computation that
needs to be done.
In a larger application, <code>main()</code>  will create objects and
use their methods.
</p>
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<!-- QUESTION DIVISION -->
<div class="question">
<h3> QUESTION 6:</h3>
<p>
Have you seen a <code>main()</code> method before?
</p>
 
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Visual Basic.Net Compiler version 0.0.0.5914 (Mono 2.4.2 - r)
Copyright (C) 2004-2008 Rolf Bjarne Kvinge. All rights reserved.


Error recovery not implemented yet.
/home/rnR61n/prog.vb (1,4) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (1,4) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (1,4) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (2,6) : Error VBNC32035: Attributes can only appear just before a declaration.
/home/rnR61n/prog.vb (3,6) : Error VBNC32035: Attributes can only appear just before a declaration.
/home/rnR61n/prog.vb (4,12) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (4,12) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (4,12) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (5,11) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (5,11) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (5,11) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (6,11) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (6,11) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (6,11) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (7,11) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (7,11) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (7,11) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (8,15) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (8,15) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (9,10) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (9,10) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (9,10) : Error VBNC30203: Not valid as identifier.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (10,3) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (10,3) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (10,3) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (12,6) : Error VBNC32035: Attributes can only appear just before a declaration.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (13,3) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (13,3) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (13,3) : Error VBNC30203: Not valid as identifier.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (15,3) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (15,3) : Error VBNC99999: Hanging attributes.
/home/rnR61n/prog.vb (15,3) : Error VBNC30203: Not valid as identifier.
/home/rnR61n/prog.vb (17,11) : Error VBNC90019: Expected '>'.
Error recovery not implemented yet.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC90019: Expected '('.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC90019: Expected 'Of'.
Error recovery not implemented yet.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC90019: Expected ')'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC30205: Expected end of statement.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC90019: Expected 'End'.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC30205: Expected end of statement.
Error recovery not implemented yet.
/home/rnR61n/prog.vb (17,12) : Error VBNC99999: vbnc crashed nearby this location in the source code.
/home/rnR61n/prog.vb (17,12) : Error VBNC99999: Unexpected error: Object reference not set to an instance of an object
  at vbnc.TypeDeclaration.Init (vbnc.Attributes CustomAttributes, Modifiers Modifiers, vbnc.MemberDeclarations Members, vbnc.Identifier Name, Int32 TypeArgumentCount) [0x00000] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/TypeDeclarations/TypeDeclaration.vb:109 
  at vbnc.GenericTypeDeclaration.Init (vbnc.Attributes CustomAttributes, Modifiers Modifiers, vbnc.MemberDeclarations Members, vbnc.Identifier Name, vbnc.TypeParameters TypeParameters) [0x0001f] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/TypeDeclarations/GenericTypeDeclaration.vb:36 
  at vbnc.PartialTypeDeclaration.Init (vbnc.Attributes CustomAttributes, Modifiers Modifiers, vbnc.MemberDeclarations Members, vbnc.Identifier Name, vbnc.TypeParameters TypeParameters, vbnc.TypeImplementsClauses Implements) [0x00000] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/TypeDeclarations/PartialTypeDeclaration.vb:43 
  at vbnc.ClassDeclaration.Init (vbnc.Attributes CustomAttributes, Modifiers Modifiers, vbnc.TypeDeclaration DeclaringType, vbnc.MemberDeclarations Members, vbnc.Identifier Name, vbnc.TypeParameters TypeParameters, vbnc.NonArrayTypeName Inherits, vbnc.TypeImplementsClauses TypeImplementsClauses) [0x00000] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/TypeDeclarations/ClassDeclaration.vb:47 
  at vbnc.Parser.ParseClassDeclaration (vbnc.ParsedObject Parent, vbnc.Attributes Attributes, System.String Namespace) [0x001aa] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/Parser/Parser(Types).vb:91 
  at vbnc.Parser.ParseTypeDeclaration (vbnc.ParsedObject Parent, vbnc.Attributes Attributes, System.String Namespace) [0x00010] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/Parser/Parser.vb:1436 
  at vbnc.Parser.ParseAssemblyMembers (vbnc.AssemblyDeclaration Parent, System.String RootNamespace, vbnc.MemberDeclarations declarations) [0x001a8] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/Parser/Parser.vb:1482 
  at vbnc.Parser.ParseAssemblyDeclaration (System.String RootNamespace, vbnc.AssemblyDeclaration assembly) [0x00092] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/Parser/Parser.vb:433 
  at vbnc.Parser.Parse (System.String RootNamespace, vbnc.AssemblyDeclaration assembly) [0x00002] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/Parser/Parser.vb:58 
  at vbnc.Compiler.Compile_Parse () [0x0006d] in /var/tmp/portage/dev-lang/mono-basic-2.4.2/work/mono-basic-2.4.2/vbnc/vbnc/source/General/Compiler.vb:363 
Compilation took 00:00:00.6203940