1. Nate Brunelle Today: Programming Languages, Stationary Aviation
CS1110
Nate Brunelle
Today: Programming Languages, Stationary Aviation

2. Questions?

3. Last Time Ambiguity (and how to avoid it) Pseudo-code
Structured way of removing ambiguity

4. Today
Programming language for Building Airplanes

5. Process for writing code
Do it yourself
Code it
Debug it

6. Bugs Syntax Semantic Logical Understandability
Statement does not “parse”
Semantic
Grammatically correct, but nonsense
Logical
Means something, but not what you meant
Understandability
I said it, it makes sense, and it means what I meant, but no one else can understand it

7. Syntax Semantic Statement does not “parse”
Dog of by chicken for running video the
W202dkdljdkla9**ls
Semantic
Grammatically correct, but nonsense
Colorless green ideas sleep furiously
Park your car upon the cloud.
3  0

8. Logical Understandability Means something, but not what you meant
“double 5” vs “5+2”
Understandability
I said it, it makes sense, and it means what I meant, but no one else can understand it
The sign should have dashes between fish and and and and and and and and and chips.
Prandial soleation is gauche.

9. Do it, Then code it You will get 3 pieces of paper
Practice making an airplane
Write how to make an airplane
Make an airplane with someone else’s directions
Procedure for today’s activity:
Code – write instructions (text only!)
And debug
Trade instructions
Follow the instructions (not politely)
Show the result back to the one who gave the instructions
Throw at Nate when done (hit me!)

10. Reflection
Shortest directions?
Unambiguous directions?

11. What makes “good” Instructions?

12. Very short instructions

13. Very short instructions
“Crumple into as small a ball as possible”
Will this make an airplane?
In general, it can be difficult to figure out what our “goal” is
We will be precise early this semester, but less so as the semester progresses.

14. Is this a set of “good” instructions?
“Create the best paper airplane you know how to make”
Yes:
No:

15. Programming Language for making airplanes
Nouns
8.5x11
Crease
Hotdog
Edge
Paper
Orientation
Corner
Verticle
Horizontal
Airplane
Triangle
Center
Middle
Verbs
Fold
Turn
Crease
Unfold
Rotate
Lift

16. Programming Language Tradeoff
Usually there is a tradeoff between:
The language being easy to learn
Instructions being easy to write

17. Nate’s Language
1,1
Only 2 verbs:
Fold
Unfold
0,0