There are two other number systems which are used in digital computers.
The other number systems are:
(i) Octal System and
(ii) Hexadecimal System.
Numbers of these systems possess simple relations with the binary numbers. Although binary arithmetic is simple and easy to manipulate, the binary representation of decimal number is lengthy and for this reason, the use of octal and hexadecimal numbers, which can be expressed as strings of bits, are preferred in some cases.
Uses of Octal and Hexadecimal Numbers:
The preceding discussion shows that octal and hexadecimal numbers can be easily converted to binary numbers and viceversa. For this reason, octal and hexadecimal numbers are useful in representing binary numbers in a compact form. Computer memory is often specified with numbers represented in groups of 8 bits which makes hexadecimal system particularly useful at this stage.
Both octal and hexadecimal number system are used for inputoutput operations and for storing data and information in memory. All arithmetic operations, however, are made in the binary system and hence ALU of the computer uses only binary systems.
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