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Introduction CS 101 Instructors Jim Cohoon Office Olsson 221 Hours: Monday 3:30 – 5:00, Tuesday 10:00 – 11:00 Email id: Aaron Bloomfield Office Olsson 228D Hours: Monday 1:00 – 2:00, Wednesday 10:00 = 11:00, Friday 10:00 – 11:00 Email: Both instructors also accept appointment

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cs 101
CS 101
  • Instructors
    • Jim Cohoon
      • Office
        • Olsson 221
        • Hours: Monday 3:30 – 5:00, Tuesday 10:00 – 11:00
        • Email id:
    • Aaron Bloomfield
      • Office
        • Olsson 228D
        • Hours: Monday 1:00 – 2:00, Wednesday 10:00 = 11:00, Friday 10:00 – 11:00
        • Email:
  • Both instructors also accept appointment
objectives
Objectives
  • Provide opportunities for the demonstration of student comprehension through lab demonstrations, tests, and homework projects
  • Provide a variety of learning experiences to instill familiarity with the fundamentals of computing systems and software development
objectives4
Objectives
  • Provide opportunities for the demonstration of student comprehension through lab demonstrations, tests, and homework projects
  • Provide a variety of learning experiences to instill familiarity with the fundamentals of computing systems and software development
    • Understand common fundamentals of programming
    • Understand fundamentals of object-oriented programming in Java
    • Appreciate importance of software engineering and Computer Science
    • Develop programs to solve specified problems.
    • Use the Java SDK environment to create, debug and run simple Java programs
prerequsites
Prerequsites
  • Genuine interest in learning the material
  • Agree to abide by the course honor policy
honor policy
Honor policy
  • When there is doubt regarding what is allowable or honorable, you will ask before doing it
  • When possible with honor, you will help your classmates learn and improve
  • You will seek honorable help before succumbing to frustration
  • You will pledge your work that you have neither given nor received unauthorized help
  • You will not describe or show problems to anyone who has not yet completed a quiz or exam
  • You will not receive information on problems before completing a quiz or exam
  • By default, collaboration is limited to the discussion of ideas
    • Code is not distributed either electronically or on paper
    • Any exceptions will be specifically noted on an assignment
honor policy7
Honor policy
  • Academic irregularities may result in failure of the course and be brought to the honor committee
  • Beware of MOSS
slide8
Text
  • Java Program Design, McGraw-Hill, 2005, ISBN 0072948655.
    • Cohoon and Davidson
grading criteria
Grading criteria
  • 5% – Laboratory participation
      • If you miss more than 2 labs, you are subject to course failure for the course
      • If for a valid reason you are unable to do your lab, there will be a make-up lab on Sunday night, provided that you get permission prior to your scheduled lab
  • 10% – Laboratory programming quizzes
  • 35% – Homework assignments
  • 25% – Midterms
      • September 29, October 27, November 22
        • Your worst midterm will be weighted ½ of your other midterms
  • 25% – Final exam
      • Scheduled time is Monday December 13 at 7:00 PM
      • See other instructors for make-ups; i.e., APMA 310 and ECON 201
  • Average grade will be at least a B-
grading criteria10
Grading criteria
  • Average grade will be at least a B-
home directory service
Home directory service
  • All assignments and lab files must be kept on your home directory
    • www.virginia.edu/homedir
sections
Sections
  • CS 101
    • Students have little or no programming experience
    • Mandatory scheduled closed labs
  • CS 101E
    • Students with programming experience
    • Open labs that are to be completed by a scheduled time
  • All students take same quizzes and tests, and do the same assignments
  • Course curve is based on the section with the lower average
let s begin
Let’s begin
  • Goal
    • Teach you how to program effectively
  • Skills and information to be acquired
    • Mental model of computer and network behavior
    • Problem solving
    • Object-oriented design
    • Java
let s begin14
Let’s begin
  • Goal
    • Teach you how to program effectively
  • Skills and information to be acquired
    • Mental model of computer and network behavior
    • Problem solving
    • Object-oriented design
    • Java
computer organization
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card
computer organization17
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

3.06 billion operationsper second

computer organization18
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

512 million bytes of

memory that can betransferred at doublethe normal rate

A byte is 8 bits

A bit is a 0 or a 1

computer organization19
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Stores 200 billionbytes of data. You want high RPM andlow seek time.0.009 seconds isaverage

computer organization20
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

17” on the diagonal.Resolution up to1,280 by 1,024pixels

computer organization21
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Microprocessor fordisplaying images with64 million bytes ofmemory. More memorysupports more colorsand higher resolution

computer organization22
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Reads DVDs 16 timesfaster than a basic DVDdrive. Can hold up to8 billion bytes of data

computer organization23
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Can read and writeCDs. Can hold 650million bytes of dataReads at 48 timesfaster and writes24 times faster thana basic drive

computer organization24
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Can send or receiveup to 56 thousandbits per second

computer organization25
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Computer operatingsystem using agraphical interface

computer organization26
Computer Organization
  • Computer advertisement specification
    • Intel® Pentium 4 Processorat 3.06GHz with 512K cache
    • 512MB DDR SDRAM
    • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time)
    • 17” LCD Monitor
    • 64MB NVIDIA GeForce4MX Graphics Card®
    • 16x Max DVD-ROM Drive
    • 48x/24x/48x CD-RW Drive
    • 56K PCI Telephony Modem
    • Windows XP Home Edition SP2 ®
    • 10/100 Fast Ethernet Network Card

Can send or receivedata at two rates – 10 or 100 million bytesper second

problem solving
Problem Solving
  • Remember
    • The goal is not a clever solution but a correct solution
problem solving28
Problem Solving
  • Accept
    • The process is iterative
      • In solving the problem increased understanding might require restarting
problem solving29
Problem Solving
  • Solutions
    • Often require both concrete and abstract thinking
      • Teamwork
problem solving process
Problem Solving Process
  • What is it?
    • Analysis
    • Design
    • Implementation
    • Testing
problem solving process31
Problem Solving Process
  • What is it?
    • Analysis
    • Design
    • Implementation
    • Testing
  • Determine the inputs, outputs, and other components of the problem
    • Description should be sufficiently specific to allow you to solve the problem
problem solving process32
Problem Solving Process
  • What is it?
    • Analysis
    • Design
    • Implementation
    • Testing
  • Describe the components and associated processes for solving the problem
    • Straightforward and flexible
    • Method – process
    • Object – component and associated methods
problem solving process33
Problem Solving Process
  • What is it?
    • Analysis
    • Design
    • Implementation
    • Testing
  • Develop solutions for the components and use those components to produce an overall solution
    • Straightforward and flexible
problem solving process34
Problem Solving Process
  • What is it?
    • Analysis
    • Design
    • Implementation
    • Testing

Test the components individually and collectively

slide36
Tips
  • Find out as much as you can
  • Reuse what has been done before
  • Expect future reuse
  • Break complex problems into subproblems
engineering software
Engineering software
  • Complexity of software grows as attempts are made to make it easier to use
    • Rise of wizards
software engineering
Software engineering
  • Goal
    • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable
software engineering39
Software engineering
  • Goal
    • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable
      • Work correctly and not fail
software engineering40
Software engineering
  • Goal
    • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable
      • Because of the long lifetime many people will be involved
        • Creation
        • Debugging
        • Maintenance
        • Enhancement
      • Two-thirds of the cost is typically beyond creation
software engineering41
Software engineering
  • Goal
    • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable
      • Cost to develop and maintain should not exceed expected benefit
software engineering42
Software engineering
  • Goal
    • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable
      • Design software so that new features and capabilities can be added
software engineering43
Software engineering
  • Goal
    • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable
      • Makes sense due to the great costs involved to have flexible components that can be used in other software
object oriented design
Object-oriented design
  • Purpose
    • Promote thinking about software in a way that models the way we think and interact with the physical word
  • Object
    • Properties or attributes
    • Behaviors
object oriented design45
Object-oriented design
  • Class
    • Term for a type of software object
  • Object
    • An instance of a class with
    • specific properties andattributes