GATE | GATE CS 1996 | Question 41

Which of the following macros can put a micro assembler into an infinite loop?
(i)

.MACRO M1 X
.IF EQ, X      ;if X=0 then
M1 X + 1
.ENDC
.IF NE X       ;IF X≠0 then
.WORD X        ;address (X) is stored here
.ENDC
.ENDM

(ii)

.MACRO M2 X
.IF EQ X
M2 X
.ENDC
.IF NE, X
.WORD X+1
.ENDC
.ENDM

(A) (ii) only
(B) (i) only
(C) Both (i) and (ii)
(D) None of the above


Answer: (A)

Explanation: In second Macro, If we assume the value of X is 0 then statement “M2 X” would be called until value of X is 0 (Recursive call).
And, the value of X is never modified hence it will fall into an infinite loop.
In first Macro,
The value of X is increased by 1 hence it will never fall into an infinite loop.

Option (A) is correct.

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