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Computer Science Set-1
Compiler Design
68

Compiler Design MCQ with Answers

68) Reduction in strength means

replacing run-time computation by compile time computation

replacing a costly operation by a relatively cheaper one

Both replacing run-time computation by compile time computation & replacing a costly operation by a relatively cheaper one

removing loop invariant computation

Answer is:

Both replacing run-time computation by compile time computation & replacing a costly operation by a relatively cheaper one

Compiler Design MCQ with Answers

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69) Running time of a program depends on

the way the registers and addressing modes are used

the order in which computations are performed

the usage of machine idioms

all of these

Answer is:

all of these

Explanation:

Running time of a program depends on
* the way the registers and addressing modes are used
* the order in which computations are performed
* the usage of machine idioms

70) If control signals {a,b,c,d,e,f,g} for some micro instructions and their corresponding MCCS (Maximum Compatibility Classes) are [ad f* g, abd, beg, b deg} , then to determine minimal MCC cover, we need to remove

adfg

afd

bcg

bdeg

Answer is:

afd

71) Assume that X and Y are non zero positive integers. What does the following Pascal program segment do?
while X < > Y do
if X > Y then
X : = X - Y
else
Y : = Y - X ;
write (X);

Computes LCM of two numbers

Divides larger number by the smaller number

Computes GCD of two numbers

None of these

Answer is:

Computes GCD of two numbers

72) A variant record in Pascal is defined by
type varirec = record
number : integer
case(varl, var2)of
var 1 : (x, y : integer);
var2 : (p.q. : real);
end;
end ;
Let an array of 100 records was declared on a machine which uses 4 bytes for an integer and 8 bytes for a real. How much space would the compiler have to reserve for the array ?

2800

2400

2000

1200

Answer is:

2000

Compiler Design MCQ with Answers

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68) Reduction in strength means

Both replacing run-time computation by compile time computation & replacing a costly operation by a relatively cheaper one

Compiler Design MCQ with Answers

Related Compiler Design MCQ with Answers

69) Running time of a program depends on

all of these

70) If control signals {a,b,c,d,e,f,g} for some micro instructions and their corresponding MCCS (Maximum Compatibility Classes) are [ad f* g, abd, beg, b deg} , then to determine minimal MCC cover, we need to remove

afd

71) Assume that X and Y are non zero positive integers. What does the following Pascal program segment do? while X < > Y do if X > Y then X : = X - Y else Y : = Y - X ; write (X);

Computes GCD of two numbers

2000

Compiler Design MCQ with Answers

71) Assume that X and Y are non zero positive integers. What does the following Pascal program segment do?
while X < > Y do
if X > Y then
X : = X - Y
else
Y : = Y - X ;
write (X);