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CS代写 | Structure and Interpretation of Computer Programs CS 61A

本次美国代写主要为计算机程序结构与与解释限时测试

Exam generated for <EMAILADDRESS> 2

Preliminaries

You can complete and submit these questions before the exam starts.

(a) What is your full name?

(b) What is your student ID number?

Exam generated for <EMAILADDRESS> 3

1. (6.0 points) The Droids You’re Looking For

Fill in each blank in the code example below so that executing it would generate the following environment
diagram on tutor.cs61a.org.

RESTRICTIONS. You must use all of the blanks. Each blank can only include one statement or expression.

Click here to open the diagram in a new window/tab

def x(wing):

poe = lambda poe: _________

Exam generated for <EMAILADDRESS> 4

# (a)

wing.append(_________)
# (b)

return _________
# (c)

droid = [8]

b = x([1])

_________
# (d)

(a) (1.0 pt) Which of these could fill in blank (a)? Check all that apply.

wing + poe
wing.extend(poe)
wing.append(poe)
list(wing).extend(poe)
list(wing).append(poe)

(b) (1.0 pt) Fill in blank (b).

droid

(c) (1.0 pt) Which of these could fill in blank (c)?

poe

poe(droid)
poe(wing)
poe(b)

(d) (3.0 pt) Fill in blank (d).

b([b([8])])

Exam generated for <EMAILADDRESS> 5

2. (16.0 points) Stoned

Definition: A hailstone sequence begins with a positive integer n. If n is even, divide it by 2. If n is odd, triple
it and add 1. Repeat until 1 is reached. For example, the hailstone sequence starting at 10 is 10, 5, 16, 8, 4, 2, 1.

Assume that all hailstone sequences are finite.

(a) (9.0 points)

Implement hailstone, which takes a positive integer n and a one-argument function g. It calls g on each
element of the hailstone sequence starting at n and returns the length of the sequence.

def hailstone(n, g):
“””Call g on each element of the hailstone sequence starting
at n and return its length.

>>> a = hailstone(10, print)
10
5
16
8
4
2
1
>>> a
7
>>> s = []
>>> hailstone(10, s.append)
7
>>> s
[10, 5, 16, 8, 4, 2, 1]
“””
if n == 1:

h = _________
# (a)

elif _________:
# (b)

h = up


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