Welcome to SoC!

CS1101S or CS1010? why are you here?

DDP folks You can sleep

Turing Programme Yes, you also can sleep

Developed at MIT in 1975 to teach programming methodology Scheme

Introduced at NUS 14 years ago Scheme 1994

What is Scheme?

(+ 5 3) (- (+ 5 3) (* 2 3)) prefix notation 8 2

(+ 5 6) (define a 5) (+ a 6) 11

Scheme is Expressive (define (square x) (* x x)) To square something, multiply it by itself (square 2) (square (square 3))

Congratulations! You know Scheme

Why Scheme?

Simple (didn’t you just learn it in 10 mins? )

Futile to Teach a Language (Here today, gone tomorrow)

Computational Thinking

Towers of Hanoi

Can you solve this for 1,000 discs?

How would we think about the problem?

What if we have one disc?

What if we have no discs? Do nothing!

Towers of Hanoi Suppose we know how to move 3 discs from A to C ABC

Towers of Hanoi Suppose we know how to move 3 discs from A to C ABC

Towers of Hanoi Claim: we can move 3 discs from A to B. Why? ABC

Towers of Hanoi Claim: we can move 3 discs from A to B. Why? ABC

Towers of Hanoi What do we do for 4 discs? ABC

Towers of Hanoi (define (move-tower size from to extra) (cond ((= size 0) ’ do-nothing) (else (move-tower (- size 1) from extra to) (print-move from to) (move-tower (- size 1) extra to from)))) fromextrato

Towers of Hanoi (define (print-move from to) (newline) (display "move top disk from ") (display from) (display " to ") (display to))

Recursion

CS1101S Road Map BASIC INTERMEDIATE ADVANCED Procedural Abstraction Higher-Order Procedures Recursion Iteration Wishful Thinking Order of Growth Data Abstraction Symbolic Data List Processing Generic Operators Object-Oriented Programming Streams Memoization Dynamic Programming Mutation & State Java Fundamental concepts of computer programming

“Star Wars” RPG

JFDI Academy

CS1101S or CS1010?

How to decide?

Puke Test

What is your pain threshold?

Scheme vs C Who would you marry? –Pretty but poor? –Rich but ugly?

Ask your friend

Ask a senior

Google is your Friend “cs1101s midterm review”

Why are you here?

What is the meaning of life?

CS1010 CS1101S CS1020CS2010 CS2020 CS1101R Scheme C JavaScript Java (4 MC) (5 MC) (1 MC)

many paths to success is not about how fast

“Your time is limited, so don't waste it living someone else's life. Don't be trapped by dogma - which is living with the results of other people's thinking. Don't let the noise of other's opinions drown out your own inner voice “

......And most important, have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary.” - Steve Jobs “

Caveat To enroll in CS1101S, min requirement of A grade for ‘A’ Level Math or equivalent. Or you can appeal at Undergrad Office For your own protection

Please indicate preference by 12 noon tomorrow

QUESTIONS