Write about Computer Number System
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https://www.computersprofessor.com/2017/08/write-about-computer-number-system.html
Computer - Number System
When we type some letters or words, the computer translates them
in numbers as computers can understand only numbers. A computer can understand
the 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.
The
value of each digit in a number can be determined using –
·
The digit
·
The position of the digit in the number
·
The base of the number system (where the base is defined as the
total number of digits available in the number system)
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, 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. Its
value can be written as
(1 x 1000)+ (2 x 100)+ (3 x 10)+ (4 x l)
(1 x 103)+ (2 x 102)+ (3 x 101)+ (4 x l00)
1000 + 200 + 30 + 4
1234
As a computer programmer or an IT professional, you should
understand the following number systems which are frequently used in computers.
S.No.
|
Number System and Description
|
1
|
Binary Number System
Base 2. Digits used :
0, 1
|
2
|
Octal Number System
Base 8. Digits used :
0 to 7
|
3
|
Hexa Decimal Number System
Base 16. Digits used:
0 to 9, Letters used : A- F
|
Binary Number System
Characteristics of the binary number system are as follows −
·
Uses two digits, 0 and 1
·
Also called as 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.
Example
Binary Number: 101012
Calculating
Decimal Equivalent –
Step
|
Binary Number
|
Decimal Number
|
Step 1
|
101012
|
((1 x 24) + (0 x 23) + (1 x 22)
+ (0 x 21) + (1 x 20))10
|
Step 2
|
101012
|
(16 + 0 + 4 + 0 + 1)10
|
Step 3
|
101012
|
2110
|
Note − 101012 is
normally written as 10101.
Octal Number System
Characteristics of the octal number system are as follows −
·
Uses eight digits, 0,1,2,3,4,5,6,7
·
Also called as base 8 number system
·
Each position in an octal number represents a 0 power of the base (8). Example 80
·
Last position in an octal number represents a x power of the base (8). Example 8x where x represents the last position - 1
Example
Octal Number: 125708
Calculating
Decimal Equivalent –
Step
|
Octal Number
|
Decimal Number
|
Step 1
|
125708
|
((1 x 84) + (2 x 83) + (5 x 82)
+ (7 x 81) + (0 x 80))10
|
Step 2
|
125708
|
(4096 + 1024 + 320 + 56 + 0)10
|
Step 3
|
125708
|
549610
|
Note − 125708 is
normally written as 12570.
Hexadecimal Number System
Characteristics
of hexadecimal number system are as follows −
·
Uses 10 digits and 6 letters, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B,
C, D, E, F
·
Letters represent the numbers starting from 10. A = 10. B = 11, C
= 12, D = 13, E = 14, F = 15
·
Also called as base 16 number system
·
Each position in a hexadecimal number represents a 0 power of the base (16). Example, 160
·
Last position in a hexadecimal number represents a x power of the base (16). Example 16x where x represents the last position - 1
Example
Hexadecimal Number: 19FDE16
Calculating
Decimal Equivalent –
Step
|
Binary Number
|
Decimal Number
|
Step 1
|
19FDE16
|
((1 x 164) + (9 x 163) + (F x 162)
+ (D x 161) + (E x 160))10
|
Step 2
|
19FDE16
|
((1 x 164) + (9 x 163) + (15 x 162)
+ (13 x 161) + (14 x 160))10
|
Step 3
|
19FDE16
|
(65536+ 36864 + 3840 + 208 + 14)10
|
Step 4
|
19FDE16
|
10646210
|
Note − 19FDE16 is
normally written as 19FDE.