# Lec 2 | MIT 6.00 Introduction to Computer Science and Programming, Fall 2008

Lecture 2: Operators and operands; statements; branching, conditionals, and iteration
Instructors: Prof. Eric Grimson, Prof. John Guttag
View the complete course at: http://ocw.mit.edu/6-00F08

More courses at http://ocw.mit.edu

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### 45 thoughts on “Lec 2 | MIT 6.00 Introduction to Computer Science and Programming, Fall 2008”

• January 8, 2022 at 1:39 pm

Watching this in 2022 is fascinating

• January 8, 2022 at 1:39 pm

MIT list the course Computer Science and yet the Lecturers don't appear to know the Science of computers.
They don't appear to know how computers work.
Therefore, how on Earth did they think computers worked?
ascii stands for: American Standard Code Information interchange.
ellipsis: .. reads through to and including.
therefore: Lower case characters: 'a' ..'z' is numbered : 97..122, Upper case characters: 'A' .. 'Z'' numbered: 65..90, Numbers 0..9 numbered: 48..57
Then you have the punctuation characters such as Space: ascii 32 or exclamation point '!' ascii 33 etc.
Of course in the Computer they'd be in binary 'A' is ascii 65 in binary would read 01000001 64 + 1 = 65
1111111 = 255 = unsigned 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 and signed 11111111 = -1 = -128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 therefore -128 + 127 = -1
binary 01000001 is 'A' in ascii 65 in binary would read 01000001 64 + 1 = 65

1111111 = 255 unsigned

• January 8, 2022 at 1:39 pm

Ashame that the audio distorts often.

• January 8, 2022 at 1:39 pm

Poor teaching, he needs to Understand that, What he's Saying is Simple for him to Understand because he has a Decade of experience. Not easy for a Layman. Our Uni was better than this, as good as Stanford.
We got lecture notes, so during the Lecture time was Spent Trying to Understand the Material, not wasting time making sure we captured the Syllabus. If someone Understands the Material, then Note taking in Own Words may help remembering. However, that's not How I work. I remember, because I understand. Not, wrote learning/memorisation and Regurgitation without Understanding.

• January 8, 2022 at 1:39 pm

I'm here so I don't become a disappointment to my family.

• January 8, 2022 at 1:39 pm

thanks MIT im watching from prison tryna hack my way out of here

• January 8, 2022 at 1:39 pm

For MIT this instructor is not that good…

• January 8, 2022 at 1:39 pm

Are these lectures still relevant in 2021? I'm just curious since computer science is a rapidly changing field

• January 8, 2022 at 1:39 pm

I am absolutely shocked that two "full" professors are being used to teach one introductory course in CS and Python programming (to non-programmers) at supposedly one of the best universities in the world. At the vast majority of colleges and universities, a TA (grad student) would be teaching this kind of course, because that is all that is needed. Once students understand and have some basic (no pun intended) programming experience, then maybe a professor would be justified.

• January 8, 2022 at 1:39 pm

What a man he is. Wow. He is a God-Sent to teach.

• January 8, 2022 at 1:39 pm

This guy is such a libtard that you can take his class when majoring in PoliSci.

• January 8, 2022 at 1:39 pm

@24:00 I slightly disagree. If you can read code anyone wrote a year after it was written and understand it clearly it is a sign of good code. There needs to be a balance on the amount of comments in code. Too many and they become like ads; no one reads them and they just clutter space.

I think of comments as ways to explain intentions. Comments are also important to warn the reader. Sometimes history can be captured but that is more for business reasons; linking a change in code to documentation or a work tracking ticket.

I teach my engineers these concepts:
1. Comments shouldn't explain the language. Example of bad comment: // this code multiples the 2 arguments and averages them
2. Rename something if it isn't clear.
3. Complex expressions often should be refactored into macros, functions, methods, etc. for readability. `if (((a + b) / 2) > last_average)` is worst than `if (AVERAGE(a, b) > last_average)` the first slows down the reader, second is concise.
4. Block comments should be a block and not inline. (We break this rule for comments within expressions `int func(/*enable=*/true, /*interations=*/6);`)
5. Line comments should be at the end of a statement.

There are a few other rules we follow.

What rules do other people follow?

• January 8, 2022 at 1:39 pm

• January 8, 2022 at 1:39 pm

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• January 8, 2022 at 1:39 pm

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• January 8, 2022 at 1:39 pm

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• January 8, 2022 at 1:39 pm

I like online education.👍

• January 8, 2022 at 1:39 pm

Well his explanation is a little complicated

• January 8, 2022 at 1:39 pm

I wish I had the book, but so far Python is a lot like basic so far.

• January 8, 2022 at 1:39 pm

Double equal is equal but equal again if it changes.

• January 8, 2022 at 1:39 pm

Disciplined 1 minute break every 10 minutes

• January 8, 2022 at 1:39 pm

I wish her would take a 1 minute break…and talk to someone…about another topic ..breaks .

• January 8, 2022 at 1:39 pm

pyhon is a new language? Certainly not for a guy watching the lectures in 2021:)

• January 8, 2022 at 1:39 pm

33:00
Students after 2021 might wonder why the following no longer works the same in the video
x=15
if (x/2)*x == x: print('even')
else: print('odd')

If you follow the code in this video the example will not work because python now converts the x value to a float automatically when using division. Integer division is achieved by using // in python 3.x which hadn't come out yet when this was released. The change took place in python 2.2 Therefore you need to replace the division sign / with // in the example. Even if your variable is set to an integer with something like x=int(input('enter a number')) you still have to use // or python will use float division.
edit. added the version where the change took place.

• January 8, 2022 at 1:39 pm

Teacher throws candy poke student eye out and gets law suit and gets fired program that.

• January 8, 2022 at 1:39 pm

when I saw it first I was really surprised beacuse it is a very good oportunitiy for the person who wants to improve himself

• January 8, 2022 at 1:39 pm

That's some terrible ass handwriting

• January 8, 2022 at 1:39 pm

Can someone just watch it and gimme the short version lol jk thanks for videos

• January 8, 2022 at 1:39 pm

Loving these lectures and learning so much, like Eric says "while" like his safe word is whiskey in Hot Rod.

• January 8, 2022 at 1:39 pm

Thank you for all educators in the world. More so when its free…that's something sacred right there.

• January 8, 2022 at 1:39 pm

print("Good luck everyone!!")

Good luck everyone!!

• January 8, 2022 at 1:39 pm

Salam olsun elm uğrunda addımlayan hər kəsə!!!
Hello to people who try to learn something.you don't even know
How great it is.i am trying to.

• January 8, 2022 at 1:39 pm

This open courseware makes me want to side with the Institute more in Fallout 4.

• January 8, 2022 at 1:39 pm

I think Mr. John Guttac and Mr. Eric Grimson are among the surviving computer scientists of the late 20th century. incredible the way they deliver the lecture

• January 8, 2022 at 1:39 pm

Despite having prior knowledge to python…
The way the professor is teaching is so hard to understand.
Learning python is best through practical course rather than explaining lol.

Instead of explaining what the code do first, its better to explain what we want to do first.