16295030
Descripción
Test por Thomas Scott, actualizado hace más de 1 año
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Creado por Thomas Scott
hace casi 6 años
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Pregunta 1
Pregunta
Which of the following is NOT a top-down parsing?
Respuesta
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Recursive descent parsing
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Backtracking
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LL(1) parsing
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None of these
Pregunta 2
Pregunta
Which of the following is true for parser generator
Respuesta
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The input of a parser generator is a token stream
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The output of a parser generator is abstract syntax tree(AST)
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CFG of a programming language is part of the input to a parser generator.
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Flex is a parser generator
Pregunta 3
Pregunta
Which of the follwoing is NOT true for parser?
i. The parser is to process a token stream
ii. One of the major responsibilities of parser is to detect syntax errors.
iii. The output of parser is an abstract syntax tree.
Respuesta
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i
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i, ii
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i, ii, iii
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ii, iii
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iii
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None of the above.
Pregunta 4
Pregunta
Grammar that produce more than one parse tree for same sentence:
Respuesta
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is ambiguous
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is unambiguous
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has syntax errors
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is not LL(1) grammar
Pregunta 5
Pregunta
Which of the following is WRONG
Respuesta
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A CFG grammar is said to be ambiguous if for a sentence, there is a leftmost derivation and a rightmost derivation
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A DFG grammar is said to be ambiguous if for a sentence, there are two leftmost derivations.
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A CFG grammar is said to be ambiguous if for a sentence, there are two rightmost derivations.
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A CFG grammar is said to be ambiguous if for a sentence, there are two different parse tree representations.
Pregunta 6
Pregunta
The context free grammar S -> SS | 0S1 | 1S0| ε generates.
Respuesta
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Equal number of 0's and 1's
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Unequal number of 0's and 1's
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Number of 0's followed by any number of 1's
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None of the above.
Pregunta 7
Pregunta
Which of the following is a Tiger program with syntax errors?
Respuesta
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1
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"1"
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x = 5
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var x: int := 5
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All of the above
Pregunta 8
Pregunta
Which of the following is a Tiger program without syntax errors?
Respuesta
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(1, 2, 3)
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(1; 2; 3;)
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(1; 2; 3)
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(1, 2, 3,)
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None of the above
Pregunta 9
Pregunta
Which of the following is a Tiger expression with syntax errors?
Respuesta
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a(1)
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b[1]
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c[2] of 3
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(10)
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NONE of the above
Pregunta 10
Pregunta
Which of the following derivations does a LL(1) parser use while parsing an input string? The input is assumed to be scanned in left to right order?
Respuesta
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Leftmost derivation
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Rightmost derivation
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None of the above
Pregunta 11
Pregunta
Assume X (terminal or non-terminal) is the top symbol in the stack, and c is the next symbol in the input in LL(1) parsing, which of the following indicates a syntax error?
i. x is any terminal other than c
ii. x is a non-terminal, but the cell M[X,c] in the parsing table is empty
iii. x is any non-terminal other than c
iv. x is a non-terminal, but the cell M[X,c] in the parsing table is not empty
Respuesta
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i
-
i and iii
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i, ii, iii, and iv
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None of the above
Pregunta 12
Pregunta
Assume FIRST(A) = {b, c, d, ε} for a non-terminal A, what's the result of FIRST(eAf) where e and f are terminals?
Respuesta
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{b, c, d, e}
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{b, c, d}
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{e, f}
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{e}
Pregunta 13
Pregunta
Assume FIRST(A) ={b, c, d, ε} for a non-terminal A, what's the result of FIRST(Ae) where e is a terminal?
Respuesta
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{b, c , d, e}
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{b, c, d}
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{e}
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{b, c, d, e, ε}
Pregunta 14
Pregunta
Assume FIRST(A) ={1, 2, ε}, and FIRST(B) = {b, d} for non- terminal A and B, what's the result of FIRST(AB)?
Respuesta
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{b, d, ε}
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{1, 2}
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{b, d, 1, 2}
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{1, 2, ε}
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{b, d, 1, 2, ε}
Pregunta 15
Pregunta
Assume FIRST(A) ={1, 2, ε}, and FIRST(B) = {b, d} for non- terminal A and B, what's the result of FIRST(BA)?
Respuesta
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{b, d}
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{1, 2}
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{b, d, 1, 2}
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{1, 2, ε}
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{b, d, 1, 2, ε}
Pregunta 16
Pregunta
Assume FIRST(A) ={1, 2, ε}, and FIRST(B) = {b, d, ε} for non- terminal A and B, what's the result of FIRST(BA)?
Respuesta
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{b, d, ε}
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{1, 2}
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{b, d, 1, 2}
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{1, 2, ε}
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{b, d, 1, 2, ε}
Pregunta 17
Pregunta
Assume FOLLOW(A) ={b, d}, FIRST(B) = {1, 2}, for non-terminal A and B, which of the following statements is correct for a production: A-> ABgh where g and h are terminals?
Respuesta
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FOLLOW(B) contains g
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FOLLOW(B) contains h
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FOLLOW(B) contains both g and h
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g and h are not in FOLLOW(B)
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FOLLOW(B) contains b, and d
Pregunta 18
Pregunta
Assume FOLLOW(A) ={b, d}, FIRST(B) = {1, 2, ε}, for non-terminal A and B, which of the following statements is correct for a production: A-> ACB where C is a non-terminal?
Respuesta
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FOLLOW(C) contains {1, 2, ε}
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FOLLOW(C) contains {b, d}
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FOLLOW(C) contains {1, 2, b, d, ε}
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FOLLOW(C) contains {1, 2, b, d}
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