1 / 12

CS 0004 –Lecture 1

CS 0004 –Lecture 1. Wednesday, Jan 5 th , 2011 Roxana Gheorghiu. Administrative Stuff. My Office : 6414 Email : roxana@ cs.pitt.edu Web Page: www.cs.pitt.edu/~roxana / cs4 Class : Mon, Wed, Fri : 10 : 0 0am -10:50am Office Hours (tentatively): Mon : 11 :00am -1: 00pm

bisa
Download Presentation

CS 0004 –Lecture 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. CS 0004 –Lecture 1 Wednesday, Jan 5th, 2011 Roxana Gheorghiu

  2. Administrative Stuff • My Office: 6414 • Email: roxana@cs.pitt.edu • Web Page: www.cs.pitt.edu/~roxana/cs4 • Class: Mon, Wed, Fri: 10:00am -10:50am • Office Hours (tentatively): • Mon: 11:00am -1:00pm • Wed: 11:00pm -1:00pm • By appointment

  3. An Introduction to Computers • What are the main components of a computer • Processor (microprocessor, CPU –Central Processing Unit) • Memory (RAM –Random Access Memory) • Hard Disk Drive (HDD) • Several device cards: graphics card, sound card, network card, modem • Input/Output (I/O) Devices: keyboard, mouse; monitor, printer

  4. Hardware, Software and Servers • Hardware • Refers to physical components of the computer • Includes all components (even I/O) • Software • All the programs written for a particular computer or for any computers • Servers vs. Personal computer • Term “Personal computer” indicates that the machine is operated by one person at a time • Term “Server” indicates that the computer provides resources to other computers

  5. Make a computer understand • Language =any system of arbitrary signals such as voice sounds, gestures or written symbols • Computer languages classification • Lowest level: Machine Code (binary) (110100100) • Assembly language: symbolic representation of Machine Code • High-level (Human –readable): Visual Basic, Java, C++ • It consists of instructions to which people can relate (Click, if, do) • Ex: Try to speak with a French guy who doesn’t know English (assuming you don’t know French  )

  6. VB Source code WindowsProgram (.exe) Private SubForm_Load() MsgBox("Hello, World!”) End Sub 11001001000101110101010100100010101101010101000101011101011010101001 0111100010101010110101001001001001 Communication protocolHuman-Readable to Machine-Readable Compiler Execute

  7. Computer Programs • A computer is a machine that does ONLY what it is instructed to • Instructions are used in addition to language • The tasks are broken down into a sequence of instructions . This sequence is called a program • The process of executing the instructions is called running the program ************ • Make the robot leave the class and come back in the same position. Language: Move (#of stapes), Turn Left, Turn Right

  8. What is a program? • Collection of instructions that: • Accepts input • Process Data • Outputs results Input Output Process

  9. Why Visual Basic? • Core of Microsoft Office Products • VBA (Visual Basic for Applications) allows us to “program” Excel • Allows you to make programs easily • Lets you focus on problem at hand • Creates GUI’s not ugly command line • Interactive with user as an Event-Driven programming language

  10. Event-driven programming paradigm • A way of designing a program: the application is driven by events • When creating an application, need to consider: • How events can be (or should be) generated • creating an interface to accept actions from the user (e.g. button click)‏ • How events are handled • coding event handlers to handle the events generated

  11. Event-driven Programming • What is an event? • e.g. clicking a button, moving a mouse over a region, pressing a key, creating a form (window), timer going off • Something that happens in the program interface at a point in time (typically done by the user)

  12. Event-driven Programming • What is an event handler? • A piece of code in our program that tells the program what to do when an event happens • e.g. when a particular button is clicked, update the display • How do events drive a program? • Each event has a handler • When an event occurs, its handler is invoked • If an event is not important, the programmer never writes an event handler, so the program ignores the event *************** • Ex: click a button, text appear in my presentation. • What is the event in this example ? What does the handler of this event do ?

More Related