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]