Computing - Java Intro to CSC116 Course Information - - PowerPoint PPT Presentation

CSC116: Introduction to Computing - Java

Intro to CSC116

Course Information

• Introductions
• Website
• Syllabus
• Schedule

Computing Environment

• AFS (Andrew File System)
• Linux/Unix Commands
• Helpful Tricks

Computers First Java Program

• Text Editor
• Remote Access
• Java Download

Instructors

• Course Instructor:

– Mrs. Michelle Glatz, mlglatz@ncsu.edu

• Office Hours: Tues/Thurs 5:00 – 6:00 in DAN 200 and by

appointment

• Email used to set up appointments
• Support email: group-csc116-glatz+007@ncsu.edu
• TAs:

– Varsha Gopal, vgopal2@ncsu.edu

• Office Hour: Fridays 11am–12pm in Daniels 200

– Brenden Lech, bglech@ncsu.edu

• Office Hour: Wednesdays 5 – 6 pm in Daniels 200

Office Hours

• CSC116 Office Hours:

– http://go.ncsu.edu/csc116teachingstaffofficehours

• We will use My Digital Hand during
• ffice hours to manage questions:

– http://mydigitalhand.org – You should have received an email invite – Please register now

Textbook

• Building Java Programs

A Back to Basics Approach 4th Edition Reges and Stepp

• NCSU CSC Department, Style Guidelines

Course Website

Moodle login page: http://wolfware.ncsu.edu

Moodle Course Page (direct link)

– course materials – submit coursework – feedback returned – grade book

Moodle

• Syllabus Link

– Syllabus

• Schedule Link

– Schedule

– In class exercise due before end of class – Other lab exercises due on Sunday night

• Assignments due at 11:45 pm

Course Structure

• The course structure is a mixture of

lecturing and practicing as we go through material.

• The idea is to reinforce the learning of new

material with hands on experience using it right away.

Exercises

• In-class: Group assignments completed in-class.

Similar to examples

• Lab: Apply new concepts. Due Weekly.
• Practice-It! Exercises: Every 2 chapters turn in

list of problems solved as Homework (screenshot pdf: cntrl-P, capture your userid)

– https://practiceit.cs.washington.edu/

– create an account – choose a problem from list – Type a solution and submit it. – The system will test it and tell you whether your solution is correct.

Programming Assignments

• There will be 6 programming projects in

addition to the Lecture Exercises.

• MUST BE DONE INDIVIDUALLY!!

Academic Integrity

• Do your own work (projects)

– Don’t copy from outside resources (don’t google it!) – Don’t look at other student’s code – Don’t show your code to another student

• See syllabus for violation penalties

Exams

• Two midterm exams
• One final exam
• Check the course schedule on our website for

dates.

• Paper exams, closed book, closed notes, closed

computer.

Message Board

• The course message board (Piazza) is a

great place to ask questions and discuss topics with the Instructor, TAs, and all the

• ther students in class

– piazza link

• The only rule is that you may not publicly

post any code that directly comes from an assignment, but example code is permitted

• Make the question private if need to post

your code.

• Post to Group 007 if specific to our section

Grading

• Minimum Grade Requirement

➢ Need a 73 to advance to CSC216

➢To earn a C- or higher you must:

• have an exam average of at least 60

AND

• have a project average of at least 60

Activity Weight

Exercises: (.2 * In-class avg + .6 * Weekly Exercise avg + .2 * Practice-it! avg) 14 Projects 30 Comprehensive Exercise 2 Exam 1 17 Exam 2 17 Final Exam 20

Regrade Requests

• The TA’s will send out an email to inform

you when they have completed grading

• f each assignment.
• To request a regrade (within one week):

➢ Send an email to the Teaching Staff support email

with Regrade Request as the subject line.

➢ group-csc116-glatz+007@ncsu.edu

➢ Include the name of the assignment and why you think it should be regraded.

Computing Environment

• Review of E115 topics that will be

important for the course.

• The materials come from the E115 Textbook

(http://ncsu.orgsync.com/org/e115/)

AFS

• AFS: Andrew File System
• Distributed file system used to organize

files, which is used at NC State

• Personal home directory –

/afs/unity.ncsu.edu/users/y/yourhome /afs/unity.ncsu.edu/users/m/mlglatz

Handy UNIX Commands

• cd
• pwd
• ls
• mkdir
• cp
• mv
• rm
• rmdir

Traverse Directory Tree & Find Current Location

• cd: change directory
• pwd: print working directory
• Log on, open a terminal window, and try

entering these command at the prompt:

– cd .. – pwd – pwd – cd username – pwd – cd ../../.. – pwd – cd ( or cd ~ ) – pwd

What’s in a directory?

• ls: list contents of directory
• Try it:

– cd /afs/eos.ncsu.edu/courses/csc/ – ls – ls -l – cd – ls -a – ls –al

Organize your CSC116 Files

• mkdir – make directory
• Try it:

– cd – mkdir csc116 – cd csc116 – mkdir exercises – mkdir projects – cd exercises – mkdir Lab1 – cd Lab1

Helpful Tricks/Shortcuts

• Up/Down arrows – Recall previous commands
• Tab completion – Completes commands/file

names

• Ctrl + C – to regain command prompt if system

is “hung up”

What you will learn in CSC116…

• Problem solving – the purpose of writing a

program is to solve a problem

• Java programming language
• Concepts of Object-Oriented Programming

(OOP) – encapsulated collection of data variables and methods

• Documentation techniques
• Testing methods

Computers

• Hardware
• Software
• Number Systems

– Base 10 (decimal) – Base 2 (binary)

• Bits and Bytes
• Programming

Hardware

• The physical components that make up a

computer:

– CPU (Central Processing Unit)

• Executes program instructions (brains)

– Memory (RAM)

• Used to store current program and data

– Hard Disk

• Permanent data storage

Software

• Computer programs
• Operating System
• Bridge between hardware, programs, user
• Allocates memory and send instructions

to CPU

• Applications
• Programs run within the operating

system

Binary and Decimal

• Typically, we (humans) use the base-10

(decimal) notation. – Uses the digits 0 through 9

• All information is stored on a computer as

binary numbers

– 1’s and 0’s (base 2)

– 10 (1 * 21 + 0 * 20) = 2 base-10 – 11 (1 * 21 + 1 * 20) = 3 base-10 – 100 (1 * 22 + 0 * 21+ 0 * 20) = 4 base-10

Binary and Decimal

• Binary (Base-2)
• Decimal (Base-10)

24 23 22 21 20 16 8 4 2 1 104 103 102 101 100 10,000 1,000 100 10 1

Convert between Decimal and Binary

• 20 Decimal to Binary (20 – 16 = 4, 4 – 4 = 0)
• 1 1 1 0 0 Binary to Decimal

16 + 8 + 4 + 0 + 0 = 28

24 23 22 21 20 1 1 1 16 8 4

Bits and Bytes

• Bit – Binary Digit
• Byte – 8 Bits
• Kilobyte (KB) 210 – 1024 bytes
• Megabyte (MB) 220 – 1,048,576 bytes
• Gigabyte (GB) 230 – 1,073,741,824 bytes

Programming Languages

• We can write a program using only 0s and 1s, but that

has many disadvantages

– Hard to look at and understand – Very tedious!

• We use a programming language instead - we write

code in English instead of 0s and 1s, which is much easier to read and understand

• The code we write is interpreted by a program called

a compiler, which translates our English into 0s and 1s for the processor to understand

• Java is the programming language we will use in this

course

Computer Programming

• Algorithm - A step‐by-step description of how to

accomplish a task.

• Program – A list of instructions to be carried out by a

computer.

• Computer Programming – the art of designing and

writing a group of instructions that the computer’s processor executes.

Computing Environments

• Use Classroom/campus linux desktop computers

– During class, used for lecture demos – Ensures that programs work on linux

• Connect Remotely to campus linux computers

– Work from home – Need wifi connection – Ensures that programs work on linux

• Work natively on your laptop

– Efficiently work at home – No need for wifi – Must transfer final files to afs and run using one of the other methods to ensure programs work on linux.

Remote Access

Windows:

• https://www.itecs.ncsu.edu/software/catalog/
• Run X-Win32 and then run PuTTY.
• X-Win32 is a X11 Windows System that enables you to display a Unix or

Linux application with a graphical user interface (GUI) on your Windows computer.

• PuTTY is a SSH client that gives you terminal access to run commands and

command-line applications (make sure to enable X11 forwarding).

• Click on application to download
• Brings you to software download page
• There is a documentation/installation link for each application.

Macintosh:

• Download and Install XQuartz: https://www.xquartz.org/
• Run XQuartz then open terminal window
• Application → Utilities → Terminal
• ssh -X -Y your_unity_id@remote.eos.ncsu.edu

File Transfer

Transfer Files between Your Laptop and AFS

• https://www.itecs.ncsu.edu/software/catalog/
• For the desired application:

– Click on supplication name

• Brings you to software download page
• Click on desired download

Windows:

• Use FileZilla and/or WinSCP.

Macintosh:

• Use FileZilla

Software

• You may download the Java 2 Standard Edition (J2SE)

Software Development Kit (JDK) from

http://www.oracle.com/technetwork/java/javase/downloads/index.html

– Download JDK version 8u191, DO NOT download version 11.

• Text Editor
• Campus Linux Computers
• gedit (gedit filename & - opens in new

window)

• Mac
• TextWrangler, Aquamacs
• Windows
• Notepad++

Configure Editor

• Configure to convert tabs to 4 spaces
• https://pages.github.ncsu.edu/engr-csc116-staff/CSC116-

Materials/course-resources/style-guidelines-resources/text-editor- spaces.html – TextWrangler : Preferences->Editor Defaults->Auto-expand tabs

Set tabs to 4 spaces restart TextWrangler for changes to take place

– Notepad++ : Settings->Preference->Language Set Tab size to 4 Check Replace by space box – Gedit: gedit icon in the application bar (top of screen) Go to Preferences. Insert spaces instead of tabs

Java Download for Laptop

• The next set of slides show the java download and set

up process.

• The current version on the download site is Version 11.

– We will be using version 8

• The java version used for demonstration is version 8

update 152 (current version is 191)

• http://www.oracle.com/technetwork/java/javase/downl
• ads/index.html

Download Java

Current Download is Version 11, don’t download this one.

Download Java

Page down to the following Version 8 downloads. Click

• n the JDK download

Accept Agreement

Installation

• Save the file to the desktop and run it
• Install to default location

The installation screen should read (don't change it): Install to: C:\Program Files\Java\jdk1.8.0_152\

Installation

Install Directory

Setting the Path – Windows

• Once the installer is finished, you must set your computer's path

before Java will work correctly – FOR WINDOWS ONLY ➢ Go to the Control Panel and double-click System ➢ Select the Advanced tab ➢ Click on the Environment Variables button ➢ Look under System Variables for "Path" Click on "Path" and then click edit ➢ Add the following to the end of the Path: ;C:\Program Files\Java\jdk1.8.0_152\bin

• Click OK.

Setting CLASSPATH - Windows

• Look to see if there is a variable named

CLASSPATH

• If there is not, then Click the "New" button.

➢ For the variable name, type:

CLASSPATH ➢ For the value, type: .; (that period semicolon) ➢Click OK. Exit out of all the open windows

Installed Correctly?

• Open up a command prompt.

– On Windows: ➢ Open Command Prompt

• On MAC OSX:

➢ Open the Applications folder,

• pen the Utilities folder, then open the Terminal application.
• Type java and hit enter

➢ "command not found“ means java is not installed correctly ➢ list of options for running java means installed ok

• Type java -version and hit enter

➢ It should list version you installed (e.g. 1.8.0_152)

Write Compile Execute

• A human writes Java code, known as source code (.java file)

– gedit HelloWorld.java &

• The Java compiler converts the source code into machine code
• r byte code (.class file)

– javac HelloWorld.java

• The computer has a Java Virtual Machine (JVM), which

translates the byte code into instructions that the specific computer’s processor can understand. – java HelloWorld

• A .class file can be used on any computer that has a Virtual

Machine, no matter what platform the class file was created on (platform independence)

• Output – messages printed to the screen

Classic First Program

• Write a program that prints the text “Hello, World!” to the

screen public class HelloWorld { public static void main(String[ ] args) { System.out.println(“Hello, World!”); } } RULE: The name you give your class MUST be the same name you give your file. Thus, the above program must be saved in a file called HelloWorld.java

In-Class Assignment

• Go to our Moodle page and work on the

HelloWorld.java assignment:

/** * This is an example class that illustrates printing a message to the screen * * @author YOUR NAME */ public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World! My name is [put your name here].");

System.out.println("I [am new to programming, have done some Java/C/etc. programming]."); System.out.println("I am a [freshman, sophomore, junior, senior] in the [department name] department."); System.out.println("At home, I use a [pc, mac, etc] with the [Windows 7/8/10, OSX, Linux, etc]

• perating system.");

} }