LEARNING OBJECTIVES
In this chapter yo u will learn about :

• Non-potensitional number system
• Positional number system
• Decimal number system 
• Binary number system
• Octal number system
• Hexadesimal number system

•  Characteristics : Each symbol represents the same value regardless of its position in the number, the symbols are simply added to find out the value of a particular number
• Difficulty : it is difficult to perform aritmmatic with such a  number  system

• Use only a few symbol called digits
• These symbols represent different value depending on the pasition they occupy in the number
• The maximum value of a single digit is always equal to one less than the value of the base

• Characteristics : A positional number system. The maximum value of a single digit is 9 (one less than the value of the base). Each position of a digit represents a spesific power of the base (10). We use this number system in our day-to-day life.

• Characteristics : A positional number system. Has only 2 symbols or digit (0 and 1). Hence its base = 2. The maximum value of a single digit is 1 (one less than the value of the base). Each position of a digit represents a specific power of the base (2). This number system is used in computers.

• Characteristics : A positional number system. Has total 8 symbols or digits (0, 1, 2, 3, 4, 5, 6, 7), Hence, its base = 8. the maximum value of a single digit is 7 (one less than the value of the base). Each position of a digit represents a spesific power of the base (8). Since there are only 8 digits, 3 bits are sufficient to represent any octal number in binary.

• Characteristics : A positional number system. Has total 16 symbol or digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F), Hence its base = 16. The symbols A, B, C,D, E and F represent the decimal value 10, 11, 12, 13, 14 and 15 respectively. The maximum value of a single digit is 15 (one less than the value of the base). Each position of a digit represents a specific power of the base (16). Since there are only 16 digits, 4 bits are sufficient to represent any hexadecimal number in binary.