Digital Electronics - Digital Arithmetic Operations and Circuits - Discussion

1. 

For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is:

[A]. the same as if the carry-in is tied LOW since the least significant carry-in is ignored.
[B]. that carry-out will always be HIGH.
[C]. a one will be added to the final result.
[D]. the carry-out is ignored.

Answer: Option C

Explanation:

No answer description available for this question.

Abdu Ahmed said: (Jul 23, 2019)  
How C? Please explain.

Kiran V said: (Aug 20, 2020)  
For Example, consider two 4-bit Numbers: A = 1100 and B = 1000; Cin =1 (as given).

Add A & B.
1100
1000
-------
10100

Now Cin added to the final result.
10100
-----1
--------
10101.

Hence, option C is correct.

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