Chapter 2 Assessment

Checkpoint 2.18.1.

There is a function we are providing in for you in this problem called square. It takes one integer and returns the square of that integer value. Write code to assign a variable called xyz the value 5*5 (five squared). Use the square function, rather than just multiplying with *.

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Checkpoint 2.18.2.

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Write code to assign the number of characters in the string rv to a variable num_chars.

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Checkpoint 2.18.3.

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The code below initializes two variables, z and y. We want to assign the total number of characters in z and in y to the variable a. Which of the following solutions, if any, would be considered hard coding?

z = "hello world"
y = "welcome!"

a = len("hello worldwelcome!")
Though we are using the len function here, we are hardcoding what len should return the length of. We are not referencing z or y.
a = 11 + 8
This is hardcoding, we are writing in the value without referencing z or y.
a = len(z) + len(y)
This is not considered hard coding. We are using the function len to determine the length of what is stored in z and y, which is a correct way to approach this problem.
a = len("hello world") + len("welcome!")
Though we are using the len function here, we are hardcoding what len should return the length of each time we call len. We are not referencing z or y.
none of the above are hardcoding.
At least one of these solutions is considered hardcoding. Take another look.

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Checkpoint 2.18.4.

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:

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What does the code shown in the codelens image print when it finishes executing?

an error
This is a correct. When using + to stick strings together, all variables need to be a string. This throws a type error.
sara 11
Hmm, this would be true if 11 was a string but it isn’t
sara11
Hmm, not quite, we stick a space on our string in line 3
"sara11"
Hmm, not quite, we stick a space on our string in line 3 and we don’t have quotes
"sara 11"
Hmm, we don’t have quotes in our string

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Checkpoint 2.18.5.

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:

name = "sara"
age = 11
info = name + " " + str(age)
print(info)

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Here is that same code again, but the error has been fixed. Which line number shows a line of code we would define as an expression?

1
This is a variable being asssigned a string value
2
This is a variable being assigned an integer value
3
Correct, "sara" + " " + age is an expression that we want to evaluate to "sara 11" and store the string in the info variable
4
This prints the string value stored the info variable

COMP 1000: Think Like a Computer: The PreTeXt Interactive Edition

Section 2.18 Chapter 2 Assessment

Checkpoint 2.18.1.

Checkpoint 2.18.2.

Checkpoint 2.18.3.

Checkpoint 2.18.4.

Checkpoint 2.18.5.