Number Systems And Codes


Common number systems used when working with computer include :

  a) BASE 10   ( Decimal )

  b) BASE 2   ( Binary )

  c) BASE 8  ( Octal )

  d) BASE 16  ( Hexadecimal )
  

Decimal number ( BASE 10 )
Contains 10 symbols and is sometimes called the BASE 10 system. 
0, 1, 2, 3, 4, 5, 6, 7, 8 and 9
Ex :  2410, 4510, 8610
 
Binary number ( BASE 2 )
The binary number system uses only the two symbols 0 and 1 and is sometimes
called the BASE 2 system.

Ex :  0, 1, 10, 11, 110, 111, 1000, 1001

Ex :  112 , 10102, 1012
 
 Octal number ( BASE 8 )
The octal number system uses the eight symbols 0, 1, 2, 3, 4, 5, 6 and 7.
Octal numbers are also referred to as BASE 8 number.
Ex :  378, 528, 468

Hexadecimal number ( BASE 16 )
The hexadecimal number system uses the 16 symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F.
Is referred to as the BASE 16 system.
Ex : 2DF16, 3D816, 6AF16
[A=10, B=11, C=12, D=13, E=14, F=15]
 
 

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