NIMCET 2008 Question Paper with solutions

Question : 91 of 120

Marks: +1, -0

A CPU has an arithmetic unit that adds bytes and then sets its V , C and Z flag bits as follows : The V -bit is set if arithmetic overflow occurs. The C-bit is set if a carry-out is generated from the most significant bit during an operation. The Z-bit is set if the result is zero. What are the values of the V , C and Z flag bits respectively after the 8-bit bytes 11001100 and 1000 1111 are added?

0,0,0
1,1,0
1,1,1
0,1,0

Validate

Solution:

1 ⟶

carry

\;\;\;1 1 0 0 1 1 0 0

+1 0 0 0 1 1 1 1

\;\;\;──────

\;\;\;1 0 1 0 1 1 0 1 1

V =1 , as there is an overflow
C =1 , as carry out is generated by must significant bits.
Z =0 , as the result is not zero
Hence,

1,1,0

is the bits obtained.

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