Not able understand the use of

2018-06-27 16:58:17

This question already has an answer here:

Using bitwise OR 0 to floor a number 5 answers

That's bitwise OR operator

Performs the OR operation on each pair of bits. a OR b yields 1 if either a or b is 1. The truth table for the OR operation is:

Bitwise ORing any number x with 0 yields x. Bitwise ORing any number x with -1 yields -1.

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