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Binary to Decimal Conversion

For e.g we have a binary number say 1001 we can convert by following steps:

We will have powers of 2 as0,1,2,3,4---n in multiplication with binary number given above:

2 to power 0 *1+2 to power 1*0+2 to power 2*0+2 to power 3*1

=1+0+0+8=9

Hence 1001=9

How to take 2's complement of a binary number

e.g 10011101 is the number

So, its 2's complement can be computed as follows

10011101

01100010 -Inverted bits(1's complement)

01100011 - 2's complement

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