TAILIEUCHUNG - Cracker Handbook 1.0 part 39

Tham khảo tài liệu 'cracker handbook part 39', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1 2 0 0 16 19 decimal. The A character is used in computation as an exponent symbol and the character is used to represent multiplication. Converting decimal numbers to binary There are several methods to convert decimal numbers to binary only one will be analyzed here. Naturally a conversion with a scientific calculator is much easier but one cannot always count with one so it is convenient to at least know one formula to do it. The method that will be explained uses the successive division of two keeping the residue as a binary digit and the result as the next number to divide. Let us take for example the decimal number of 43. 43 2 21 and its residue is 1 21 2 10 and its residue is 1 10 2 5 and its residue is 0 5 2 2 and its residue is 1 2 2 1 and its residue is 0 1 2 0 and its residue is 1 Building the number from the bottom we get that the binary result is 101011 Hexadecimal system On the hexadecimal base we have 16 digits which go from 0 to 9 and from the letter A to the F these letters represent the numbers from 10 to 15. Thus we count 0 1 2 3 4 5 6 7 8 9 A B C D E and F. The conversion between binary and hexadecimal numbers is easy. The first thing done to do a conversion of a binary number to a hexadecimal is to divide it in groups of 4 bits beginning from the right to the left. In case the last group the one most to the left is under 4 bits the missing places are filled with zeros. Taking as an example the binary number of 101011 we divide it in 4 bits groups and we are left with 10 1011 Filling the last group with zeros the one from the left 0010 1011 Afterwards we take each group as an independent number and we consider its decimal value 0010 2 1011 11 But since we cannot represent this hexadecimal number as 211 because it would be an error we have to substitute all the values greater than 9 by their respective representation in hexadecimal with which we obtain 2BH where the H represents the hexadecimal base. In order to convert a .

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