本课程来源为MIT6_0001F16公开课，希望对大家有所帮助，有疑问的地方也请大家提出来。
Leture1
先干了slide里的三碗鸡汤！
position yourself to succeed!
New to programming? PRACTICE. PRACTICE? PRACTICE!
can’t passively absorb programming as a skill
WHAT DOES A COMPUTER DO
Fundamentally:
- performs calculations
a billion calculations per second!
- remembers results
100s of gigabytes of storage!
What kinds of calculations?
- built-in to the language
- ones that you define as the programmer
computers only know what you tell them. (not have a mind.)
Types of Knowledge
Declarative knowledge is statements of fact.
-
someone will win a Google
-
Cardboard before class ends
Imperative knowledge is a recipe or “how-to”.
- Students sign up for raffle
- Ana opens her IDE
- Ana chooses a random number between 1st and nth responder
- Ana finds the number in the responders sheet. Winner!
Basic Machine Architecture
Object
objects are
- scalar (cannot be subdivided)
- non-scalar (have internal structure that can be accessed)
Scalar Objects
- int – represent integers, ex. 5
- float – represent real numbers, ex. 3.27
- bool –representBooleanvaluesTrueandFalse
- NoneType – special and has one value, None
- can use type() to see the type of an object
TYPE CONVERSIONS (CAST)
can convert object of one type to another
- float(3) converts integer 3 to float 3.0
- int(3.9) truncates float 3.9 to integer 3