Hackerrank Scalar Types and Operators 5

Question 1

What is the result of `complex(2, 3) + complex(1, -1)`?

Accepted Answer

(3+2j)

Answer

Complex addition adds real and imaginary parts separately: `(2+1)` and `(3-1)` give `3+2j`.

Question 2

Which of the following is NOT a valid Python integer literal?

Accepted Answer

0d255

Answer

Python supports hex (`0x`), octal (`0o`), and binary (`0b`) literals, but there is no decimal prefix `0d`.

Question 3

What does `float('inf') > 10**100` return?

Accepted Answer

True

Answer

`float('inf')` represents positive infinity in Python and is greater than any finite number.

Question 4

What is the value of `0.1 + 0.2 == 0.3` in Python?

Accepted Answer

False

Answer

Floating-point arithmetic is inexact; `0.1 + 0.2` evaluates to `0.30000000000000004`, not exactly `0.3`.

Question 5

What is the result of `int(True) + int(False) * 5`?

Accepted Answer

1

Answer

`int(True)` is `1` and `int(False)` is `0`; operator precedence makes this `1 + (0 * 5)` = `1`.

(Hackerrank) HackerRank Python Certification Practice Test