numberOfSetBits: Get number of non-zero bits of a 32bit integer
Source: https://stackoverflow.com/questions/109023/how-to-count-the-number-of-set-bits-in-a-32-bit-integer
Description
Get number of non-zero bits of a 32bit integer
Source: https://stackoverflow.com/questions/109023/how-to-count-the-number-of-set-bits-in-a-32-bit-integer