CIS 125, Visual Basic .NET I, Spring 2006 Program Directions given to a computer. Programmers People who write programms Successful programmers are analytical thinkers. They are able to approach a problem in many differnt ways adn identify the strengths adn weaknesses of each approach. Patience, strong writing and communication skills, and the ability to work well in a team. Machine Languages 00110110 10110110 Assembly Languages Mnemonics, abreviations for instructions, (MUL a1, ax), ADD High-level Languages grossPay=hours * rate Visual Basic .NET, Java, C#, C/C++ Interpreter Line by line converts high-level code to machine code Compiler translates entire program into machine code before running Procedure-Oriented programming Concentrates on major tasks Object-Oriented programming Focused on the objects used to acomplish its goal Top-Down vs. OOD Top-Down used to plan procedure-oriented programs OOD used to plan OOP Object can be seen or touched can contain attributs & methods Attribute A watch (Object) has several attributes, such as crown, dial, hour hand, minute hand, and movement Also called properties Method A watch(Object) keeps track of time Class blueprint used to create an object Encapsulates contains Instance Kevin is an instance of Person Abstraction Hide the complex details to the users of the object Hidden & Exposed Only allow the user access to what they need Inheritance Create one class from another Derived Class inherites from base class Base Class attributes and methods shared by it's "children" Polymorphism same instruction to be carried out differently depending on the object A dog makeNoise( ) would bark, while a cow makeNoise( ) would moo See Text pages 7 - 29