Binary: 0,1
Octal: 6,7
Decimal: 0,1,2,3,4,5,6,7,8,9
Hex: 0,1,2,3,4,5,6,7,8,9, A, B, C, D, E, F
Computer devices use binary, since only the binary 0 and 1, can easily represent the two states in the circuit, the machine can easily be identified.
Hex may correspond to a 4-bit binary number, hexadecimal binary to represent more convenient, two-digit hexadecimal just can represent a byte. So modern computer commonly used in hexadecimal.
4 representative of a binary hexadecimal, correspond to the following
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 |
| 8 | 9 | A | B | C | D | E | F |
| 1000 | 1001 | 1010 | 1011 | 1100 | 1101 | 1110 | 1111 |
Making hex and binary conversion, convert each hexadecimal into 4-bit binary to
A4 -> 1010 0100
And converted to binary hexadecimal 4 is divided into a set of converted into a hexadecimal can, the absence of zero padding
11101 -> 0001 1101 -> 1D