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Learning Objectives

Computing Fundamenatls CMSC 201 Computer Science I Penny Rheingans University of Maryland Baltimore County (with inspiration from previous 201 instructors and the creators of UMBC ’ s CMSC 101 and HMC ’ s CS5). Learning Objectives.

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Learning Objectives

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  1. Computing FundamenatlsCMSC 201Computer Science IPenny RheingansUniversity of Maryland Baltimore County(with inspiration from previous 201 instructors and the creators of UMBC’s CMSC 101 and HMC’s CS5)

  2. Learning Objectives • To have a very basic overview of the components of a computer system • To understand how data is represented and stored in memory • To be aware of elements of the UMBC computing environment

  3. Computing Systems • Hardware Components • Central Processing Unit (CPU) • Auxiliary Processors (GPU, etc) • Memory • Bus • Network Connection • External Devices: keyboard, monitor, printer • Software Components • Operating System: Linux, MacOS, Windows, etc • Applications

  4. Binary Representation • All information is store in a binary representation (ie, it’s all 1s and 0s): code, text, images, sounds • For each type of item/object, there are specific formats that define who to represent that thing (character, digit, sound, image, etc) in binary • But why use binary?

  5. But why binary ?

  6. Place Value Notation

  7. Converting from Binary • What are the decimal equivalents of: • 101 • 1111 • 100000 • 101010

  8. Converting to Binary • What are the binary equivalents of • 9 • 27 • 68 • 1000

  9. UMBC Computing Environment • We will develop our programs using UMBC’s GL system • GL is running the Linux Operating System • GUI interface – Graphical user interface • Command-Line Interface – When you connect to GL using SSH • Lab 1 will walk you through using the UMBC computing environment

  10. How do I connect to GL? • Assuming you have Internet access, use SSH • Windows Download Putty (Lab has a video about this) Hostname – gl.umbc.edu Make sure you pick SSH Put in username and password • Mac SSH client already installed Go to the Application folder and select Utilities Open up a terminal Window Type ssh -l username gl.umbc.edu Put in your password

  11. Linux Commands • See: http://www.csee.umbc.edu/resources/computer-science-help-center/#Resources • For now, let’s just learn: • ls – list Display the files and directories in your current directory • cd – change directory Directory is another word for folder .. = parent directory . = current directory • mkdir- make directory Note: Commands are case-sensitive

  12. Directories • Can contain files and other directories (calledsubdirectories) • /afs/umbc.edu/users/first/second/username/home 201 myOtherClass • When you log into Gl, you will be in your home directory • use the cd command to go to subdirectories lab1 HW1 lab1.py

  13. emacs • Reference: http://www.csee.umbc.edu/summary-of-basic-emacs-commands/ • emacs – a text editor • We will generally use emacs to write our python code • To open a file that you want to call example.txt (replace example.txt with your file name): • Type: emacs example.txt • To save a file: • CTRL X and CTRL C • To reopen the file: • Type: emacs example.txt • To remove the file • Type: rm example.txt

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