UGC-NET | UGC NET CS 2014 Dec – III | Question 4

Match the following:

List – I	List – II
(a)XCHG	(i)only carry flag is affected.
(b)SUB	(ii) no flags are affected.
(c)STC	(iii) all flags other than carry flag are affected.
(d)DCR	(iv)all flags are affected.

codes:

	(a)	(b)	(c)	(d)
(1)	(iv)	(i)	(iii)	(ii)
(B)	(iii)	(ii)	(i)	(iv)
(C)	(ii)	(iii)	(i)	(iv)
(D)	(ii)	(iv)	(i)	(iii)

(A) (A)
(B) (B)
(C) (C)
(D) (D)


Answer: (D)

Explanation:

In XCHG instruction exchange of data takes place so, no flags are affected.

In SUB instruction subtraction occurs so, all flags are affected.

STC is set carry flag so, only carry flag will be affected

DCR is decrement flag all flag other then carry will be affected.

So, option (D) is correct.

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