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Computer Science and Quiz Test for Preparation

71. Three address code involves
A. exactly 3 address
B. at the most 3 address
C. no unary operators
D. none of these

72. The best way to compare the different implementations of symbol table is to compare the time required to
A. add a new name
B. make an inquiry
C. add a new name and make an inquiry
D. all of these

73. Advantage of panic mode of error recovery is that
A. it is simple to implement
B. it never gets into an infinite loop
C. both (a) and (b)
D. none of these

74. To recover from an error, the operator precedence parser may
A. insert symbols onto the stack and onto the input
B. delete symbols from the stack
C. delete symbols from the input
D. all of these

75. Reduction in strength means
A. replacing run-time computation by compile time computation
B. replacing a costly operation by a relatively cheaper one
C. Both (a) & (b)
D. removing loop invariant computation

76. Running time of a program depends on
A. the way the registers and addressing modes are used
B. the order in which computations are performed
C. the usage of machine idioms
D. all of these

77. 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
A. adfg
B. afd
C. bcg
D. bdeg

78. 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);
A. Computes LCM of two numbers
B. Divides larger number by the smaller number
C. Computes GCD of two numbers
D. None of these

79. 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 ?
A. 2800
B. 2400
C. 2000
D. 1200

80. The goto statement causes control to go to a/an
A. function
B. operator
C. variable
D. label