Hackerrank Scalar Types and Operators 3

Question 1

What is the result of `round(2.675, 2)` in Python 3?

Accepted Answer

2.67

Answer

Due to floating-point representation, `2.675` is stored as slightly less than `2.675`, so `round()` returns `2.67`.

Question 2

Which of the following will raise a `TypeError` in Python?

Accepted Answer

'5' + 3

Answer

Python does not implicitly convert strings to numbers, so concatenating a string with an int raises a `TypeError`.

Question 3

What is the value of `abs(-7.5)`?

Accepted Answer

7.5

Answer

`abs()` returns the absolute (non-negative) value of its argument, preserving the float type.

Question 4

What does `bool(0.0)` return?

Accepted Answer

False

Answer

Any numeric zero (`0`, `0.0`, `0j`) is falsy in Python and converts to `False`.

Question 5

What is the result of `2 ** 3 ** 2` in Python?

Accepted Answer

512

Answer

Exponentiation is right-associative, so this evaluates as `2 ** (3 ** 2)` = `2 ** 9` = `512`.

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