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Binary →
Binary is a specific data representation scheme that encodes information as base-2 bit patterns; it relies on general data representation concepts (mapping abstract values to concrete encodings, numeral systems, bit width, layout/alignment) to interpret and design its encodings.
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Hexadecimal →
Understanding bits, bytes, number bases, and encoding in data representation is prerequisite to interpreting and using hexadecimal as a base-16 scheme for memory addresses, literals, and binary data.
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Number Systems →
Understanding bits, bytes, and encoding (e.g., two's complement, fixed-width storage) explains why and how binary, octal, and hexadecimal bases map to machine-level representations and conversions.