[Solved] What will be the output of the following Python function when the input is 19?def countSetBits(num: int) -> int: return bin(num).count('1') print(countSetBits(19)) | Bit Manipulation

Bit Manipulation - Number of 1 Bits (Hamming Weight)

What will be the output of the following Python function when the input is 19?

def countSetBits(num: int) -> int:
    return bin(num).count('1')

print(countSetBits(19))

A4

B2

C3

D1

Step-by-Step Solution

Solution:

Quick Trick: Count '1's in binary representation [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Counting decimal digits instead of binary bits looks plausible but is incorrect.

Interviewer Note:

CONTEXT

Master "Number of 1 Bits (Hamming Weight)" in Bit Manipulation

3 interactive learning modes - each teaches the same concept differently

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What will be the output of the following Python function when the input is 19?