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0xff is a number represented in the hexadecimal numeral system (base 16). It's composed of two F numbers in hex. As we know, F in hex is equivalent to 1111 in the binary numeral system. So, 0xff in binary is 11111111. In this article, we'll discover how to use the 0xff value.
Go to this link for your reference and other troubleshooting procedures https://stackoverflow.com/questions/5771048/what-is-0xff-in-c
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