Macros

Question 1

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
Compiler-DesignMacrosGATE 1996
Question 1 Explanation: 
If M2 macro is called with X=0, then it will go into an infinite loop.
Question 2

The conditional expansion facility of macro processor is provided to

A
test a condition during the execution of the expanded program
B
to expand certain model statements depending upon the value of a condition during the execution of the expanded program
C
to implement recursion
D
to expand certain model statements depending upon the value of a condition during the process of macro expansion
Compiler-DesignMacrosGATE 1997
Question 2 Explanation: 
Macro is expanded during the process of Macro expansion.
There are 2 questions to complete.

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