This key facts covers Hexadecimal: The Programmer's Shorthand within Binary & Hex for GCSE Computer Science. Revise Binary & Hex in 3.3 Data Representation for GCSE Computer Science with 16 exam-style questions and 22 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 8 of 15 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Hexadecimal: The Programmer's Shorthand
Why Hexadecimal is Used:
- Compact: 1 hex digit = 4 binary bits. "FF" = "11111111" (much shorter!)
- Human-readable: Easier to spot patterns and errors than long binary strings
- Memory addresses: 0x7FFF is easier than 0111111111111111
- Colors: #FF5733 (red=FF, green=57, blue=33)
- MAC addresses: A4:5E:60:E2:7B:3C
Hex Notation:
- Prefix with "0x" or "#" to indicate hex: 0xAF, #FF5733
- Sometimes subscript: 2F16
Practice questions for Binary & Hex
Which of the following correctly describes the hexadecimal number system?
Explain why hexadecimal is used instead of binary when programmers write memory addresses and colour codes. Give three reasons.