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In a true alpha-numeric code numbers are assigned to all characters - no letters are used. This is so that computers can process the code. The best-known example of an alpha numeric code is ASCII, where the numbers 0 - 255 are assigned to all the standard letters (upper and lowercase having different codes) and the digits 1 - 0, as well as the other characters a keyboard can type. A coide which uses both letters and numbers is one such as Hexadecimal Code - this is a form of counting using 16 as a base instead of the more usual 10. The code uses 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and then uses A for 10, B for 11, C for 12, D for 13, E for 14 and F for 15. 16 is represented in this code as 10. Hexadecimal allows decimal numbers of 0 - 255 to be represented by two characters.

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Q: What letters are used in alpha numeric code?
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