Electronics - Arithmetic Operations and Circuits - Discussion

3. 

Adding the two's complement of –11 + (–2) will yield which two's complement answer?

[A]. 1110 1101
[B]. 1111 1001
[C]. 1111 0011
[D]. 1110 1001

Answer: Option C

Explanation:

No answer description available for this question.

Harish said: (Jun 29, 2011)  
Can anyone explain me ?

Kavi said: (Aug 18, 2011)  
for (11) --> 1011
1's Com (11) --> 0100
2's Com (11) --> 0101

for (2) --> 0010
1's Com (2) --> 1101
2's Com (2) --> 1110

Add 2's Comp (11) & (2)
0101 + 1110 --> 10011 --> last digit carry so eliminate -->0011

for negative sign we can use 1.
so the ans is
1111 0011

Sharanya said: (Jun 17, 2013)  
It is simple. -11+(-2)=-13. So taking 2's complement for -13, we get, 1111 0011.

Priya said: (Sep 1, 2013)  
For negative sign we use only one 1. Then how did you said @Kavi? please explain me?

Kimsy said: (May 18, 2016)  
Thank you @Sharanya.

You made it in short and easy way!

Albert said: (Nov 19, 2016)  
@Kimsy it's not that easy & @ Sharanya you explained it wrong.

We have to add 2's complement of (-11) and (-2). But Sharanya explained the simple addition and then 2's complement of the result.

Goud said: (Jul 22, 2018)  
Thank you @Kavi.

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