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Digital Arithmetic Operations and Circuits - Technical MCQs

Q1:

Convert each of the decimal numbers to 8-bit two's-complement form and then perform subtraction by taking the two's-complement and adding.

A 0001  0011

B 0000  1110

C 0010  1110

D 1110  0000

ANS:B - 0000  1110

The given answer is right because convert 18 and 4 in 8 bit that means 18 = 0001 0010.

4 = 0000 0100.

Now convert 4 into 2's complement i.e 1111 1011.

+ 1.
-----------.
1111 1100.

Now add this by 18.

0001 0010.
+1111 1100.
-------------.
1 0000 1110.

Neglect carry hence we got the answer.