GATE1992-3,i

Question

Write short answers to the following:

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

.MACRO MI,X .IF EQ,X M1 X+1 .ENDC .IF NE,X .WORD X .ENDC .ENDM

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

Give an example call that does so.

Comments

plz solve this

Answer 1

Macro $M_2$ can put the macro assembler into an infinite loop when called with $M_2(0)$

$(EQ(X)$ is TRUE when $X = 0)$

For $M_1$ the argument $X$ is incremented for the recursive call and so the macro expansion will happen maximum $2$ times.