0xff = 16 x 15 + 15 = 255
The letters A-F are used to represent the decimal numbers 10-15 (respectively) which are required to be held in one hexadecimal digit.
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255 in decimal. 377 in octal. 11111111 in binary.
100, which equals 163 in hexadecimal.
10011101: Decimal = 157 Hexadecimal = 9D
4 is 4 in hexadecimal of decimal.
162 - 1 = 255 Strictly speaking the highest value is FF which, in decimal is 1515 = 4.38*1017 or approx 438 quadrillion.