CST 310: Computer Science Languages

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CST 310 Computer Science Languages

• Irfan Pyarali
• http//www.cs.wustl.edu/irfan/cst310/Lecture1.ppt
  

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Talking Points

• Course Goals and Structure
• Syllabus
• Introductions
• Computers
• Editors and compilers
• First Java program
• Assignments

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Course Goals and Structure

• Demystify Java -)
• Impart good design, software engineering,
  algorithm, and data structure techniques for
  using Java effectively
• Emphasis is on practicing these techniques while
  also addressing Java language concepts and
  constructs
• The class is heavily example-driven
• The class will combine lectures, interactive
  discussions, and hands-on exercises
• It is very important to practice reading and
  writing Java

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Syllabus

• http//www.cs.wustl.edu/irfan/cst310/syllabus.doc

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Introductions

• Instructor Irfan Pyarali
• irfan_at_cs.wustl.edu
• http//www.cs.wustl.edu/irfan
• Teaching Assistant TBD
• Students
• Name
• Workplace
• Why are you taking this class?
• Expectations, fears, etc.
• Something about yourself

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Computers

• What is a computer?
• A computational device
• Logical decisions billions of times faster than
  humans
• Hardware
• keyboard, screen, disks, memory, CPU
• Software
• email, word processing, spreadsheets, OS
• Programs and applications makes the computer
  intelligent

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Algorithms

• Pseudo code
• Instructions
• Correct
• Precise
• Efficient
• Maintainable
• Variables

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Computer Organization

• Input unit
• keyboard, microphone
• Output unit
• screen, printer
• Memory unit
• Random Access Memory (RAM)
• short-term, rapid access, low capacity warehouse
• Arithmetic and logic unit
• calculations, comparisons
• Central Processing Unit (CPU)
• instruction execution
• Secondary storage unit
• disks, tapes
• long-term, slow access, high capacity warehouse

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Computer Architecture
CPU
Memory
I/O
Program Control Unit
ALU
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Computing Modes

• Batch Processing
• one job at a time
• Multiprogramming
• many jobs simultaneously
• Timesharing
• multiple jobs, multiple users

• Personal computer (PC)
• standalone units
• Distributed computing
• workload distributed over networks
• Client/Server
• client machine provides user interface
• server machine provide computational power and
  storage location

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WWW (World Wide Web)

• Interconnection of computers
• Browsers
• Web pages
• HTML
• Applets
• ActiveX

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Programming Languages

• Machine Language
• machine/hardware dependent
• Too hard to program in
• Assembly Language
• English-like operations (e.g., load, store, add)
• High-level languages
• single statement can accomplish substantial tasks
• English-like statements with mathematical
  notations

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First Java Program
/ My first simple Java program / public class
Hello public static void main (String
args) System.out.println ("Hello
World")
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Assignment

• Reading Chapters 1, 2, and 3
• Programming
• Chapter 1 Question 7
• Write a program that writes the following to the
  screen
• Your Name
• Your Phone Number(s)
• Your SSN
• Submit .java files via email to irfan_at_cs.wustl.edu