بسم الله الرحمن الرحيم
Number Systems
There are four important number systems which you should become familiar with. These are decimal, binary, octal and hexadecimal. The decimal system, which is the one you are most familiar with, utilizes ten symbols to represent each digit. These are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. This system is referred to as base 10, or radix 10 system. Similarly, the binary system is base 2, octal is base 8, and hexadecimal is base 16 as shown in Table 1.1
Table 1.2 below shows an example of counting from 0 to 18 in each of the four number systems
In computer systems, the number or value of zero is frequently encountered. It is incorrect to refer to this as "nothing" since this term will be reserved to mean "no information". In fact, the value 0 conveys as much information as the value 1. Therefore, throughout this course, the value 0, an all-zeros pattern, 0 volts, or a constant voltage level must never be referred to as "nothing"
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