Number Systems
Many number systems are in use in digital technology. The most common are the decimal, binary, octal, and hexadecimal systems. The decimal system is clearly the most familiar to us because it is a tool that we use every day. Examining some of its characteristics will help us to better understand the other systems. In the next few pages we shall introduce four numerical representation systems that are used in the digital system. There are other systems, which we will look at briefly.
- Decimal
- Binary
- Octal
- Hexadecimal
Decimal System
The decimal system is composed of 10 numerals or symbols. These 10 symbols are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Using these symbols as digits of a number, we can express any quantity. The decimal system is also called the base-10 system because it has 10 digits.Even though the decimal system has only 10 symbols, any number of any magnitude can be expressed by using our system of positional weighting.
Eg : 23.445, 2335,767.234.
Binary SystemIn the binary system, there are only two symbols or possible digit values, 0 and 1. This base-2 system can be used to represent any quantity that can be represented in decimal or other base system.The binary number system is the most important one in digital systems, but several others are also important. The decimal system is important because it is universally used to represent quantities outside a digital system. This means that there will be situations where decimal values have to be converted to binary values before they are entered into the digital system
Eg : 1001,101010,11111
Octal System
The octal number system has a base of eight, meaning that it has eight possible digits: 0,1,2,3,4,5,6,7.Although this was once a popular number base, especially in the Digital Equipment Corporation PDP/8 and other old computer systems, it is rarely used today. The Octal system is based on the binary system with a 3-bit boundary.
Eg : 123,765,345.
Hexadecimal System
The hexadecimal system uses base 16. Thus, it has 16 possible digit symbols. It uses the digits 0 through 9 plus the letters A, B, C, D, E, and F as the 16 digit symbols.Hex is just a more human readable version of binary. I would say 11111111 in binary but it is much easier to say FF in hex, which is 255 in decimal by the way. Hex is just a very easy way to remember a group of bits, in this case 4 bits. You might say hex is simply shorthand for binary.
Eg : AC67,F63,689.
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