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Base 16 number system, which consists of symbols 0-9 and A-F. It is a useful system in computers because there is an easy mapping from 4 bytes to a single hex digit. Thus one can represent every byte as a two consecutive hexadecimal digits. For example: 0001 = 1 0010 = 2 0011 = 3 0100 = 4 ... 1010 = 10 1011 = A ... 1111 = F So the the binary representation for 79 (0100 1111) can be written as 4F. |
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Hexadecimal (often abbreviated hex) is a base 16 number system, which consists of symbols 0-9 and A-F. It is a useful system in computers because there is an easy mapping from 4 bits to a single hex digit. Thus one can represent every byte as a two consecutive hexadecimal digits. |
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0001 = 1 0010 = 2 0011 = 3 0100 = 4 ... 1001 = 9 1010 = A = 10 1011 = B = 11 ... 1111 = F = 15 |
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Hex is an abbreviation of Hexadecimal. So the counting is as follows: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, .. 19, 1A, 1B, ..., 1F, 20, ..., 9F, A0, ... |
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So the the binary representation for 79 (0100 1111) can be written as 4F. |
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In texts there are several ways to denote hexadecimal numbers. One (derived from C) is to start with '0x'. Another way (from Pascal) is to end the numbers with a 'h'. So, 20h is the same as 0x20, which equals 32 in [decimal counting]?. |
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There are many ways to denote hexadecimal numbers. One (derived from C) is to start with '0x'. Pascal programmers would indicate hex by an appended 'h'. Sometimes a prefixed dollar symbol signals a hexadecimal number. When numbers of various bases are used together, the base is often noted in a subscript of the number. |
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