"The hexadecimal code of ABCDEF" is rather difficult to make. If you want the DECIMAL code for the HEXADECIMAL numbers A, B, C, D, E and F, then you get this explanation:
Hexadecimal means 16 and if you are counting hexadecimal and you will start to count from 0 to 9 normally. Then you get A for 10, B for 11, C for 12 D for 13 E for 14 and F for 15.
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Octal = 52746757 Binary = 101010111100110111101111
4 is 4 in hexadecimal of decimal.
The first use of the term hexadecimal dates to 1954. It is unclear who invented the current hexadecimal notation - most likely IBM. Not all computers used hexadecimal until the end of the 70s or later. Hewlett-Packard continued to use octal instead of hexadecimal until after 1980.
The binary number 01011010 is 005A in hexadecimal.
The highest numerical digit is 9, but hexadecimal follows that with letters going to F. So in hexadecimal, F would be the highest digit.