Scheme

Question 1

What is the parent language of Scheme?

Answer 1

Lisp

Question 2

Who were the creators of Scheme?

Answer 2

Gerald Jay Sussman and Guy L. Steele Jr.

Question 3

What’s the name of the influential textbook that solidified Scheme’s place in computer science education?

Answer 3

Structure and Interpretation of Computer Programs (SICP)

Question 4

What notation does Scheme use for operators?

Answer 4

Prefix notation (Polish notation)

Question 6

What is the purpose of the car function?

Answer 6

It returns the first element of a list.

Question 7

What is the purpose of the cdr function?

Answer 7

It returns all elements of a list except the first one.

Question 8

What does the lambda keyword do?

Answer 8

Creates an anonymous function

Question 9

Identify the Scheme construct that allows creating local variables:

Answer 9

let

Question 10

Identify the Scheme function that allows you to combine multiple expressions to be evaluated in sequence:

Answer 10

begin

Question 11

Identify the Scheme feature that enables defining new functions:

Answer 11

define

Question 12

Identify the Scheme control structure used for multi-way conditional branching:

Answer 12

cond

Question 13

Identify the Scheme construct that enables mutation of variables:

Answer 13

set!

Question 14

Identify the Scheme function used to check if an item is a member of a list:

Answer 14

member

Question 15

Identify the Scheme feature that made it different from other Lisp dialects in its early days:

Answer 15

Lexical scoping

Question 16

Identify the Scheme construct used to read user input:

Answer 16

read

Question 17

True or False. Scheme supports both dynamic and static typing.

Answer 17

False - Scheme is dynamically typed

Question 18

True or False. In Scheme, parentheses are optional when calling functions.

Answer 18

False - parentheses are required

Question 19

True or False. The car and cdr functions are used for list manipulation in Scheme.

Answer 19

True

Question 20

True or False. In Scheme, variables must be declared with an explicit type.

Answer 20

False

Question 21

True or False. Hygienic macros were introduced to make macro expansions safer and more predictable.

Answer 21

True

Question 22

True or False. Scheme uses curly braces {} to define function bodies.

Answer 22

False - it uses parentheses

Question 23

True or False. Scheme supports first-class functions, meaning functions can be passed as arguments

Answer 23

True

Question 24

True or False. Scheme is a statically typed language.

Answer 24

False - it's dynamically typed

Question 25

True or False. Racket is a direct implementation of the Scheme language.

Answer 25

False - it's a descendant/dialect of Scheme

Question 26

Assign 10 to variable x

Answer 26

(define x 10)

Question 27

Scheme is classified as:

Answer 27

functional programming language

Question 28

(cons 1 '(2 3))

Answer 28

Construct list → (1 2 3)

Question 29

(car '(a b c))

Answer 29

First element → a

Question 30

(cdr '(a b c))

Answer 30

Rest of list → (b c)

Question 31

Concatenation → "Hello, World!"

Answer 31

(string-append "Hello, " "World!")

Question 32

Single line comment

Answer 32

;

Question 34

Prevents evaluation of an expression

Answer 34

' (quote)

Question 35

Boolean true

Answer 35

(#t)

Question 36

Boolean false

Answer 36

(#f)

Question 38

True or False. Variables in Scheme are dynamically typed

Answer 38

True

Question 39

Variables declared in ______are global unless inside a let or lambda, making them local.

Answer 39

define

Question 40

Scheme uses___to modify the value of an already defined variable.

Answer 40

set! Example: (define x 10) ; Declare a variable (set! x 20) ; Reassign x to 20

Question 41

Moves to a new line

Answer 41

(newline)

Question 42

Ask user a number and store it in variable num and display it.

Answer 42

(display "Enter a number: ") (define num (read)) (display num)

Question 43

No else if—use ___instead.

Answer 43

cond

Question 44

True or False. Since Scheme is functional, it prefers recursion over loops.

Answer 44

True

Question 45

True or False. Functions in Scheme are first-class citizens, meaning they can be stored in variables, passed as arguments, and returned from other functions.

Answer 45

True

Question 46

Make a function 'square'

Answer 46

(define (square x) (* x x)) (display (square 4))

Question 47

Make a function square using lambda

Answer 47

((lambda (x) (* x x)) 5)

Question 48

A ____allows a function to retain access to variables from its enclosing scope, even after that scope has exited.

Answer 48

closure

Question 49

What is the output: (define (add-ten x) (let ((ten 10)) (+ x ten))) (display (add-ten 5))

Answer 49

15

Question 50

What is the output: (define (counter) (let ((count 0)) (lambda () (set! count (+ count 1)) count))) (define my-counter (counter)) (display (my-counter)) (display (my-counter)) (display (my-counter))

Answer 50

1 2 3

Question 51

Creates a list

Answer 51

list Example: (list 1 2 3)

Question 52

Constructs a pair

Answer 52

cons Example: (cons 1 '(2 3))

Question 53

First element of a list

Answer 53

car (Contents of the Address part of Register number)

Question 54

Rest of the list

Answer 54

cdr (Contents of the Decrement part of Register number)

Question 55

Concatenates lists

Answer 55

append Example: (append '(1 2) '(3 4)) Output: ( 1 2 3 4 )

Question 56

Concatenates strings

Answer 56

string-append Example: (string-append "foo" "bar") Output: “foobar”

Question 57

True or False. Standard Scheme does not have built-in parallel execution

Answer 57

True

Question 58

True or False. Scheme have built-in coroutine support

Answer 58

False. But continuations (call/cc) allow coroutine-like behavior.

Question 59

What does (if #t 1 2) return?

Answer 59

1

Question 60

What does (map (lambda (x) (* x 2)) '(1 2 3)) return?

Answer 60

(2 4 6)

Question 61

What does (cons 0 '(1 2 3)) return?

Answer 61

(0 1 2 3)

Question 62

(display (map (lambda (x) (* x x)) '(1 2 3 4)))

Answer 62

(1 4 9 16)

Question 63

(define (square x) (* x x)) (display (map square '(1 2 3 4)))

Answer 63

(1 4 9 16)

Question 64

(call/cc (lambda (exit) (for-each (lambda (x) (if (> x 5) (exit x))) '(1 2 3 6 7 8))))

Answer 64

6

Question 66

(begin (display "Hello, ") (display "World!"))

Answer 66

Hello, World! to make it Hello, World! add (newline)

Question 69

When was Scheme created?

Answer 69

1975

Question 70

Define a local variable

Answer 70

(let ((x 5)) (+ x 3)) ; This will return 8

Question 71

Scheme use _____ for syntax

Answer 71

S-Expressions

Question 72

The latest standard is

Answer 72

R^7RS Small

Question 73

Converts string to numbers

Answer 73

string->number

Question 74

Converts number to string

Answer 74

number->string

Question 75

Converts string to symbol

Answer 75

string->symbol

Question 76

caddr

Answer 76

third element of the list