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Computer Science Set-1
Compiler Design
57

Compiler Design MCQ with Answers

57) In some programming languages, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denotes the sets of letters and digits respectively, which of the following expressions define an identifier ?

( L∪ D ) *

L ( L ∪ D)*

( L . D )*

L . ( L . D )*

Answer is:

L ( L ∪ D)*

Compiler Design MCQ with Answers

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58) A language L allows declaration of arrays whose sizes are not known during compilation. It is required to make efficient use of memory. Which one of the following is true ?

a compiler using static memory allocation can be written for L

a compiler cannot be written for L ; an interpreter must be used

a compiler using dynamic memory allocation can be written for L

none of these

Answer is:

a compiler using dynamic memory allocation can be written for L

59) What are x and y in the following macro definition?
macro
Add x, y
Load y
Mul x
Store y
end macro

variables

identifiers

actual parameters

formal parameters

Answer is:

formal parameters

60) What is the value of X printed by the following program ?
program COMPUTE ( input, output );
varX : integer ;
procedure FIND ( X: real ) ;
begin
X : = sqrt ( X ) ;
end ;
begin
X : = 2
FIND ( X )
writeln ( X )
end

√2

Run-time error

none of these

Answer is:

2

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

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

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

both (a) and (b)

none of these

Answer is:

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

Compiler Design MCQ with Answers

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57) In some programming languages, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denotes the sets of letters and digits respectively, which of the following expressions define an identifier ?

L ( L ∪ D)*

Compiler Design MCQ with Answers

Related Compiler Design MCQ with Answers

58) A language L allows declaration of arrays whose sizes are not known during compilation. It is required to make efficient use of memory. Which one of the following is true ?

a compiler using dynamic memory allocation can be written for L

59) What are x and y in the following macro definition? macro Add x, y Load y Mul x Store y end macro

formal parameters

60) What is the value of X printed by the following program ? program COMPUTE ( input, output ); varX : integer ; procedure FIND ( X: real ) ; begin X : = sqrt ( X ) ; end ; begin X : = 2 FIND ( X ) writeln ( X ) end

2

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

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

Compiler Design MCQ with Answers

59) What are x and y in the following macro definition?
macro
Add x, y
Load y
Mul x
Store y
end macro

60) What is the value of X printed by the following program ?
program COMPUTE ( input, output );
varX : integer ;
procedure FIND ( X: real ) ;
begin
X : = sqrt ( X ) ;
end ;
begin
X : = 2
FIND ( X )
writeln ( X )
end

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