1. Demystifying Programming
August 18
the basics
Demystifying Programming

2. Today’s agenda Review last class Intro to Programming
Intro to Abstraction
Blown to Bits!

3. Create Piazza Account Get an assigned laptop for the year
Create a Piazza account via Teacher website at Lincoln. Follow the steps.

4. Sample 1st Program

5. Who has programmed before?
ACTIVITY:
First hear from the “real” programmers.
Goal is to get everyone to realize that they’ve programmed.
Ask them about:
Alarm clocks
VCR / TiVo
Microwave
Then start asking them what other electronic device that they use where they tell it to do something for them…

6. ACTIVITY:
First hear from the “real” programmers.
Goal is to get everyone to realize that they’ve programmed.
Ask them about:
Alarm clocks
VCR / TiVo
Microwave
Then start asking them what other electronic device that they use where they tell it to do something for them…

7. You all are already programmers!
ACTIVITY:
First hear from the “real” programmers.
Goal is to get everyone to realize that they’ve programmed.
Ask them about:
Alarm clocks
VCR / TiVo
Microwave
Then start asking them what other electronic device that they use where they tell it to do something for them…

8. Group Exercise: Write and evaluate short program NumCourses = 3
English = 3.2
Algebra = 2.7
Chemistry = 3.1
GradePtAve = _____________________
Part One: Write the formula
Part Two: Calculate the GPA

9. Group Exercise - Recap Write and evaluate short program NumCourses = 3
English = 3.2
Algebra = 2.7
Chemistry = 3.1
GradePtAve = ( English + Algebra + Chemistry ) / NumCourses
GPA = ( ) / 3
= 3.0

10. Central Processing Unit (CPU)
Computer Architecture
Display
Memory
Central Processing Unit (CPU)
Input / Output (IO)
Ex. Keyboard
DIsk

11. 3. Arithmetic Logic Unit (ALU) 1 3
1. Instructional Memory
Stores the instructions that get fed into the ALU.
2. Main Memory
Stores the variable names and variable values.
3. Arithmetic Logic Unit (ALU)  
It executes the instructions, performs the calculations, and returns the results. 2

12. 4. Program Counter. 5. Variables1 3
4. Program Counter.
Tells the ALU what step to execute next.
5. Variables
They store the results from the ALU processing. 2

13. 4 5 1 3 2

14. 4 5 1 3 2

15. fundamentals
Abstraction

16. Abstraction
Detail removal
and
Generalization

17. Detail removal
The act or process of leaving out of consideration one or more properties of a complex object so as to attend to others.

18. Detail removal
Automatic Generation of Detail Maps Maneesh Agrawala (UCB EECS), among others

19. The London Underground map (1928 vs 1933) by Harry Beck
Detail removal
Abstraction is the idea that you focus on the essence, the cleanest way to map the messy real world to one you can build
The London Underground map (1928 vs 1933) by Harry Beck

20. Generalization
The process of formulating general concepts by abstracting common properties of instances

21. Generalization you have a farm with many animal kinds.
different food for each
you have directions that say
To feed dog, put dog food in dog dish
To feed chicken, put chicken food in chicken dish
To feed rabbit, put rabbit food in rabbit dish
Etc…
how could you do better?
To feed <animal>, put <animal> food in <animal> dish

22. Generalization y = sin(x)
we’ll be doing this all the time in this class
sometimes it may even look like math!
y = sin(x)
we think about what inputs make sense to use so we don’t have to duplicate code

23. Abstraction is a BIG idea fundamental to CS
ACTIVITY:
First hear from the “real” programmers.
Goal is to get everyone to realize that they’ve programmed.
Ask them about:
Alarm clocks
VCR / TiVo
Microwave
Then start asking them what other electronic device that they use where they tell it to do something for them…

24. Abstraction
Ford Model T
Tesla Model S

25. Class Reading
“Blown to Bits: Your Life, Liberty, and Happiness After the Digital Explosion”
by Hal Abelson

26. Lab Exercise: Using the computer at your desk,
find the free online version of the class text:
“Blown to Bits: Your Life, Liberty, and Happiness After the Digital Explosion”
by Hal Abelson

27. Lab Exercise:

28. Reviewing Today:
Intro to Programming Computing Intro to Abstraction Computing Blown to Bits!

29. Computer Program Counter. Variables
Tells the ALU what step to execute next.
Variables
They store the results from the ALU processing.

30. Computer Arithmetic Logic Unit (ALU) Main Memory Instructional Memory
It executes the instructions, performs the calculations, and returns the results.
Main Memory
Stores the variable names and variable values.
Instructional Memory
Stores the instructions that get fed into the ALU.

31. Homework Read Chapter 1*
before the start of class on Tuesday, Sept 6st (for 4st period)
Wednesday, Sept 7th (for 3nd period)
*NOT just the excerpt

33. code.org watch via youtube https://www.youtube.com/watch?v=fbQTez4a0ck
watch via youtube