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What does Hamming weight/population count mean in Bit arrays?

(a) Finding the number of 1 bit in a bit array

(b) Finding the number of 0 bit in a bit array

(c) Finding the sum of bits in a bit array

(d) Finding the average number of 1’s and 0’s in bit arrays

The question is from Bit Array topic in section Arrays Types of Data Structures & Algorithms I

The question was posed to me by my college professor while I was bunking the class.

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Right option is (a) Finding the number of 1 bit in a bit array

The explanation is: Hamming/ population count involves finding the number of 1’s in the bit array. Population count is used in data compression.

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