## Thursday, July 25, 2013

### PPT On Computer Number System

Presentation On Computer Number System

Computer Number System Presentation Transcript:
1.Computer - Number System

2.When we type some letters or words, the computer translates them in numbers as computers can understand only numbers.
A computer can understand positional number system where there are only a few symbols called digits and these symbols represent different values depending on the position they occupy in the number.

3.A value of each digit in a number can be determined usingThe digit
The position of the digit in the number
The base of the number system (where base is defined as the total number of digits available in the number system).

4.Decimal Number System
The number system that we use in our day-to-day life is the decimal number system.
Decimal number system has base 10 as it uses 10 digits from 0 to 9. In decimal number system, the successive positions to the left of the decimal point represent units, tens, hundreds, thousands and so on.
Each position represents a specific power of the base (10). For example,

5.the decimal number 1234 consists of the digit 4 in the units position, 3 in the tens position, 2 in the hundreds position, and 1 in the thousands position, and its value can be written as
(1x1000)+ (2x100)+ (3x10)+ (4xl)
(1x103)+ (2x102)+ (3x101)+ (4xl00)
1000 + 200 + 30 + 1
1234

6.As a computer programmer or an IT professional, you should understand the following number systems which are frequently used in computers.

7.Number System & Description
Binary Number System Base 2. Digits used: 0, 1
Octal Number System Base 8. Digits used: 0 to 7
Hexa Decimal Number System Base 16. Digits used: 0 to 9, Letters used: A- F

8. Binary Number System
Characteristics:-
Uses two digits, 0 and 1.
Also called base 2 number system
Each position in a binary number represents a 0 power of the base (2). Example 20
Last position in a binary number represents a x power of the base (2). Example 2x where x represents the last position - 1.

9.EXAMPLE
Binary Number: 101012
Calculating Decimal Equivalent:

10.Octal Number System
Characteristics
Uses eight digits, 0,1,2,3,4,5,6,7.
Also called base 8 number system
Each position in a octal number represents a 0 power of the base (8). Example 80
Last position in a octal number represents a x power of the base (8). Example 8x where x represents the last position - 1.