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Sunday, 26 July 2015

Number systems


A number system defines a set of values used to represent quantity.
The study of number system will give us an insight into how a computer manipulates and stores numbers.It is not only used in computers but also in various electronic devices.


1.  The Decimal number system.

  • The number system with which we are the most familiar with ,that which we have been taught in school is the decimal system.
  • The largest value of a digit in this system is 9.
  • Each digit represents a different multiple of 10.These multiples are also called as weighted values.
  • The leftmost digit is called as the MSB(most significant bit ).
  • The rightmost digit is called as the LSB(least significant bit).  

2. Binary number system


  • Any electronic device does not operate on Decimal number system and hencethe binary number system has gained importance specially in the electronics and computer systems.
  • A binary uses only two digits '0' & '1' respectively.
  • The binary digits(0 & 1)are also known as bits.Thus binary system is a two bit system.

  • Above is an example how to interpret a binary number in terms of our basic decimal nos.

3.Octal Number System

  • In order to represent large numbers in the binary format we will need huge strings of 0's and 1's.
  • The octal system can be used for reducing the size of the large binary number.
  • Each digit in the octal system will assume 8 different values from 0 to 7. 

4.Hexadecimal Number System

  • When dealing with large values, binary numbers become too unwidely.
  • The numbers are from 0 to F in which 0 to 9 represents the number as it is.
  • After 9 ,10 is represented A,11 by B and so on till 15 by F. 
  • The largest value of a digit in the hexadecimal number higher than F will be 10.
  • The largest two digit hexadecimal number is FF which corresponds to 255 in decimal system.

NOTE  :  Each number system can be converted from one form to other.The method for converting every number system to binary and vice versa is explained in the video.


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