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Octal and Hexadecimal Numbers

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They are numbers written in a different base sytem than decimal.

Octal numbers are base 8, so only contain the numerals 0,1,2,3,4,5,6,7.

Hexadecimal numbers are base 16, so contain 0,1,2 ... 13,14,15. numbers 10 - 15 are commonly written A-F, so you get 0,1,2....,9,A,B,C,D,E,F.

These bases are used because they map to binary nicley, both being powers of two.

If you've never used binary before, I suggest you look it up.

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