Binary

Unicode

Unicode uses between 8 and 32 bits per character, so it can represent characters from languages from all around the world. It is commonly used across the internet. As it is larger than ASCII, it might take up more storage space when saving documents. Global companies, like Facebook and Google, would not use the ASCII character set because their users communicate in many different languages.

One hex

4 bits

Errors

Hex is often used in error messages on your computer. The hex number refers to the memory location of the error. This helps programmers to find and then fix problems.

ASCII table

Character Denary value Binary value Hex N 78 1001110 4E O 79 1001111 4F P 80 1010000 50 Q 81 1010001 51 R 82 1010010 52

Character set

Every word is made up of symbols or characters. When you press a key on a keyboard, a number is generated that represents the symbol for that key. This is called a character code. A complete collection of characters is a character set.

2hex

8 bits(1byte)

Binary table

Denary Binary Hexadecimal 0 0000 0 1 0001 1 2 0010 2 3 0011 3 4 0100 4 5 0101 5 6 0110 6 7 0111 7 8 1000 8 9 1001 9 10 1010 A 11 1011 B 12 1100 C 13 1101 D 14 1110 E 15 1111 F This means an 8-bit binary number can be written using only two different hex digits - one hex digit for each nibble (or group of 4-bits). It is much easier to write numbers as hex than to write them as binary numbers. For example: 11010100 in binary would be D4 in hex FFFF3 in hex would be 11111111111111110011 in binary

Extended ASCII

Extended ASCII code is an 8-bit character set that represents 256 different characters, making it possible to use characters such as é or ©. Extended ASCII is useful for European languages.

Using hexadecimal

Hex codes are used in many areas of computing to simplify binary codes. It is important to note that computers do not use hexadecimal - it is used by humans to shorten binary to a more easily understandable form. Hexadecimal is translated into binary for computer use. Some examples of where hex is used include: colour references assembly language programs error messages

Hexadecimal

Hexadecimal Hexadecimal (or hex) is a base 16 system used to simplify how binary is represented. A hex digit can be any of the following 16 digits: 0 1 2 3 4 5 6 7 8 9 A B C D E F. Each hex digit reflects a 4-bit binary sequence.

ASCII

The ASCII character set is a 7-bit set of codes that allows 128 different characters. That is enough for every upper-case letter, lower-case letter, digit and punctuation mark on most keyboards. ASCII is only used for the English language.