COSC 1301 Introduction

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Nov 2, 2013 (3 years and 10 months ago)

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COSC 1301

Introduction

Plan for Today:


Review course policies and coverage


Homework, Projects and Exams


Class Communication


Computers and the Internet: In Our Lives


Brief Introduction to Chapter 1: Computers then and now




Homework and Projects


Written assignments to turn in during class


News articles on class material: turn in hard copy of article, and be
prepared to summarize it in class on due date


Electronically submitted assignments


via Dropbox


via Blackboard


Python Programs


We will use Python 3


Optional reference: Python Programming for the Absolute Beginner (3
rd

edition) by Dawson


Webpages (using HTML and CSS)


Exams


Two in
-
class midterm exams (24% each)


Cover material from lecture, textbook, homework and projects


Final exam (25%)


During final exam period


date and time assigned by university



Communication


Class discussion on piazza:
p
iazza is a class communication tool


student and instructor edited Q&A


If you have a question of general interest between class meetings, post it on
piazza


then everyone gets to see the answer.


Do not post homework/project solutions


No off
-
topic posts or disrespectful posts


Email: marye at stedwards.edu (much preferred to phone calls)


Office hours: Mondays 10
-
11, Wednesdays 2
-
3 or by appointment
(please email me)


JBWS 278

Ancient History


1970s



Ancient History: Computers:

Then…

The IBM 360:

1960s and 1970s

Approximately 2 MB (1/500 GB) of memory

Computers: Then and Now

Circa 1970: 1/500 GB


2013:
16 GB

Moore’s Law


Not actually a law


Observation by George Moore, Intel co
-
founder, that:


# of transistors on integrated circuit seems to double every two years


Corresponding exponential increase in processing speed and memory
capacity

Moore’s Law

Computing Power: Now

Many times more transistors produced each year than number of grains of rice consumed.

Plus: A transistor is cheaper than a grain of rice!

Your “Computers”


What was your first computer?


Mine: Apple
IIe




What “computers” do you use regularly now?


Computer Programming: Then…

One card per program instruction.

Each character in the program statement encoded per column


the first character, Z, is encoded as 001000000001


Through

1970s:

Programs on

Punch Cards

Computer Programming: Then…

HELLO CSECT The name of this program is 'HELLO'

* Register 15 points here on entry from OPSYS or caller.


USING *,12 Tell assembler which register we are using for
pgm
. base


STM 14,12,12(13) Save registers 14,15, and 0 thru 12 in caller's Save area


LR 12,15 Set up base register with program's entry point address


LA 15,SAVE Now Point at our own save area


ST 15,8(13) Set forward chain


ST 13,4(15) Set back chain


LR 13,15 Set R13 to address of new save area

*
-
end of housekeeping (similar for most programs)
-


WTO 'Hello World' Write To Operator (Operating System macro)

*


L 13,4(13) restore address to caller
-
provided save area


LM 14,12,12(13) Restore registers as on entry


SR 15,15 Set register 15 to 0 so that the return code (R15) is Zero


BR 14 Return to caller

*

SAVE DS 18F Define 18
fullwords

to save calling program registers


END HELLO This is the end of the program

Assembly Language Program: Prints the message “HELLO WORLD” to the console

Computer Programming: Now


We’ll write the “Hello World” program in Python:

def

main():



print(“Hello World”)

main()

Why Not English?


Why can’t we just write our programs in English?


English is ambiguous


What does “Feed the cat John” mean?


And: “We saw her duck”


Google “English structure”:


hierarchical structure of the government in Great Britain


structure of sentences in the English language


etc.

Where are the Computers?

1960s/

1970s

Today



This Class

Textbook

What can Computers do?


Beat former champs at Jeopardy!


Youtube
:
http
://
www.youtube.com/watch?v=FC3IryWr4c8


Dr. Watson

'A machine like that is like 500,000 of me sitting at Google and
Pubmed
.‘

--

Herbert Chase, M.D., Columbia University


Wired magazine:
http://www.wired.com/wiredscience/2012/10/watson
-
for
-
medicine/

What’s Next?

Autonomous traffic management