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Number guides

Short guides on bases, bits and two's complement.

What is a number systemA simple explanation of positional notation and how bases work.Two's complement and negative numbersHow computers represent negative numbers in a fixed bit width.Why hexadecimal is used in programmingWhy hex is so common in programming.Understanding bitwise operationsA rundown of bitwise operations: AND, OR, XOR, NOT and shifts.Bits, bytes and data unitsAn overview of bits, bytes and data units like KB, MB and GB.Octal and file permissionsUnderstanding Unix file permissions like chmod 755 in octal.