Hexadecimal, Unicode, ASCII

What are the possible digits in the hexadecimal system (Base 16)?

The possible digits are 0 to 9 and A to F, where A to F represent denary digits 10 to 15.

What are some practical applications of hexadecimal systems?

Defining colours in HTML, Defining Media Access Control (MAC) addresses, Assembly languages and machine code, Debugging via memory dumps.

How do you convert A5 hexadecimal to denary?

(16×10) + (1×5) = 165.

How do you convert 65 to hexadecimal?

65 ÷ 16 = 4 | Remainder 1 | ∴ 65 in hexadecimal = 41.

What does a character set generally include?

Upper & lower case letters, number digits, punctuation marks, and other characters.

What is character encoding?

Character encoding assigns binary representations to each character in a character set.

What are the three common character encoding standards?

ASCII, Extended ASCII, and Unicode.

What is ASCII encoding and how many possible characters can it represent?

ASCII uses 7 bits, allowing 128 possible characters, representing only the English alphabet.

How does Extended ASCII differ from ASCII?

Extended ASCII uses 8 bits, allowing 256 possible characters, and includes most European languages' alphabets.

What is Unicode encoding and what is its benefit?

Unicode is a superset of ASCII and Extended ASCII, using 2 or 4 bytes per character, supporting a wide range of global languages.

What are the storage space differences between ASCII, Extended ASCII, and Unicode?

ASCII uses 7 bits per character, Extended ASCII uses 8 bits, and Unicode uses 2 or 4 bytes per character.