SLIDE 1
CS1110 Nate Brunelle Today: How do computers? Questions? Last - - PowerPoint PPT Presentation
CS1110 Nate Brunelle Today: How do computers? Questions? Last - - PowerPoint PPT Presentation
CS1110 Nate Brunelle Today: How do computers? Questions? Last Time Paper airplanes Programming Languages How do we solve problems? In ancient times: Today: there was a book that started out with four pictures: first there
SLIDE 2
SLIDE 3
Last Time
- Paper airplanes
- Programming Languages
SLIDE 4
How do we solve problems?
- In ancient times:
- Today:
SLIDE 5
SLIDE 6
…there was a book that started out with four pictures: first there was a wind-up toy; then there was an automobile; then there was a boy riding a bicycle; then there was something else. And underneath each picture, it said "What makes it go?"
SLIDE 7
"What makes it go? Everything goes because the sun is shining." “The toy goes because the spring is wound up” "How did the spring get would up“ "I wound it up" "And how did you get moving?" "From eating" "And food grows only because the sun is shining. So it's because the sun is shining that all these things are moving"
SLIDE 8
What makes computers go?
One answer:
Sun Plankton Coal Electricity Transistors/memory
SLIDE 9
What makes computers go?
Transistors/memory Programs Algorithms
𝑄, 𝑄 ⇒ 𝑅 𝑅
Mathematics
SLIDE 10
Software “lifecycle”
1. Requirement
– Generally very Broad
2. Specification
– More precise description of something which fulfills the above requirement – Does not tell exactly what to create, only includes the pieces
3. Design
– How are the pieces arranged?
4. Implementation
– Create something as dictated by the design
5. Testing
– Verify that the implementation satisfies the original requirement
6. Maintenance
– Fix, improve, refine your implementation
SLIDE 11
Implementation
SLIDE 12
Your homework
1. Requirement
– Project
2. Specification
– Provided
3. Design
– Provided
4. Implementation
– Your job
5. Testing
– Some provided
6. Maintenance
– Ignore
SLIDE 13
Python to Physics
CPU Processor RAM “Short term” Memory Disk Long-term Memory
SLIDE 14
Python to Physics
- Requirements -> specification -> design -> “.py”
CPU Processor RAM “Short term” Memory Disk Long-term Memory
.py
My Program
python
Another Program
.pyc
My program’s Meaning Compile “Do stuff” x86-64
SLIDE 15
How the CPU works
Represents 1 Represents 0
0V 1V 2V 3V 4V 5V
0s and 1s represent voltages, which are manipulated by transistors
SLIDE 16
16
Current in Current out 𝑦 𝑧 Current in Current out Current flows if 𝑦 has voltage NMOS transistor 𝑦
Transistors
Current flows if both of 𝑦 and 𝑧 have voltage
SLIDE 17
Want to learn more about these steps?
- Software Development Lifecycle:
– CS2110, CS3240 (adv. Software)
- Implementation
– Most CS Classes (notably CS2150, CS4102)
- Compiling
– CS4610 (PL), CS4620 (compilers), CS4414 (OS)
- Machine Code
– CS2150, CS3330 (architecture)
- Math with Transistors
– CS2102 (discrete math), ECE2330 (digital logic design)
- Transistors to CPUs
– CS3330 (architecture)
Not Mentioned: CS3102 (theory of computation)
SLIDE 18
Python vs Pycharm
- Python
– Language
- Pycharm
– “tool” for writing python
SLIDE 19
How to use Pycharm
- 1. Open Pycharm
- 2. Open project
- 3. Create a python file
- 4. Name the file
- 5. Code
- 6. Run