Electronics and Communication Engineering - Digital Electronics - Discussion

2. 

2's complement of binary number 0101 is

[A]. 1011
[B]. 1111
[C]. 1101
[D]. 1110

Answer: Option A

Explanation:

1's complement of 0101 is 1010 and 2's complement is 1010+1 = 1011.


Amogh said: (Jul 6, 2014)  
2's complement = 1's complement + 1.

Sangeetha.P said: (Jul 17, 2014)  
2's complement means last number is subtract by 2 then the other numbers are subtracted by 1.

OTHER WAY TO FIND THE 2'S COMPLEMENT:
1. Take 1's complement.
2. And add 1 with that 1's complement answer.

Bharathy said: (Oct 23, 2016)  
How to find 1's complement? please help me.

Vishdinho said: (Apr 3, 2017)  
@Bharathy.

Put complement one time for every bit (replace 0 by 1 and 1 by 0).

That means 1's complement of 0101 is 1010.

Anusha said: (Aug 25, 2017)  
We have to follow 2 steps to find out the 2's complement.
1.find out 1's complement for the given num.
(0's becomes 1's and 1's become 0's)
2.Add 1 to the result of 1's complement.
So,(1) 1's complement of 0101 becomes 1010.
(2)add 1 to this result,

1010(1's complement)
1 (adding of 1)
---------------
1011. (2's complement).
It is the final answer..

Sowmya said: (Jan 31, 2018)  
0101.

1's complement is 1010.
Add 1 to 1's complement is called 2's complement.
i.e.,1010+1=1011.

Harika said: (Mar 11, 2020)  
Answer: A.
2's complement = 1's complement+1.
1's complement means take the complement of given data.like given data is 0101 = 1010.
Next 1 should be added to that complement.

1010
1
........
1011

So option A correct.

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