There are 10 different types of people in the world. Those who understand binary and those that don’t.

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Presentation transcript:

There are 10 different types of people in the world. Those who understand binary and those that don’t.

 Computers can only work with binary data.  Binary data can easily represent numbers.  If we make each number represent a letter, or character, then we can store characters.  One common code uses seven bits to store each character.  This is enough for 2 7 (128) different characters. Enough for all the English language letters plus many symbols such as !”£$%.

 One of the oldest ways to represent characters is the ASCII code.  ASCII = American Standard Code for Information Interchange. BinaryDenaryHexCharacter A B C D E F G

 128 characters are not enough to encode all languages.  There are other systems that use more than 7 bits.  EBCDIC is the Extended Binary Coded Decimal Interchange Code – this is used in IBM mainframes.  It uses 8 bits so can encode 256 different characters.

 Unicode is more common these days.  Unicode comes in different variants, but can encode more than 107,000 characters, covering 90 languages.  For example, Հայերեն हिन्दी עברית ಕನ್ನಡ ქართული कश्मीरी كشميري ) Кыргызча മലയാളം मराठी

 A character set is the total list of characters that are available for a character coding system.  ASCII can code for 128 characters – they are mapped to the 128 possible 7-bit binary numbers.  Unicode defines what characters it encodes and then uses a suitable number of octets to store them as a number.