Hexadecimal
FF
Hexadecimal System Guide
Hexadecimal System
The hexadecimal system uses 16 symbols: 0-9 and A-F (A=10, B=11, C=12, D=13, E=14, F=15). It's a shorthand for binary - each 4 bits is one hex digit. Example: 11111111₂ = FF₁₆ = 255₁₀. Used in programming and colors.
Why Hex Matters
Binary 255 is 11111111 (8 digits). Hex FF (2 characters) - easier for humans to read and enter. Memory addresses, RGB colors, Unicode code points use hex. Color definitions in CSS: #FF0000 (red), #00FF00 (green), #0000FF (blue).
Practical Applications
In CSS colors: #3498db blue, #2ecc342 green. In UUID v5: 550e8400-ea29-41d3-af15-6528adf68cc2. ROM/EEPROM dumps as hex. MAC addresses: aa:bb:cc:dd:ee:ff. In debuggers memory addresses as 0x0040A7C0.