Saturday, 6 October 2018

October 06, 2018 - , No comments

IPv4 Subnetting: Decimal to Binary Conversion:: Subtraction Method


Subtraction (Long Method)

Procedure: The given number (n) is repetitively subtracted by the constant value of binary bit position.  If the result of operation is less than zero (0) skip to the next constant bit value until it reaches zero(0).



Rule: If the given number (n) subtracted by the constant bit position value of binary equals to positive number, set the bit position to one(1) else one (0). To write the equivalent binary number you start from top to bottom. Use the constant bit position value to solve it quickly.


 128 64 32 16 8 4 2 1
217 - 128 = 89 1 1
89 - 64 = 25 1 1
25 - 32 = -7 0 0
25 - 16 = 9 1 1
9 - 8 = 1 1 1
1 - 4 = -3 0 0
1 - 2 = -1 0 0
1 - 1 = 0 1
1

Binary Equivalent: 11011001



 128 64 32 16 8 4 2 1
255 - 128 = 127 1 1
127 - 64 = 63 1 1
63 - 32 = 31 1 1
31 - 16 = 15 1 1
15 - 8 = 7 1 1
7 - 4 = 3 1 1
3 - 2 = 1 1 1
1 - 1 = 0 1
1

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