CS606 Midterm Online Quiz

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CS606-Midterm

1 / 50

Alternative of the backtrack in parser is Look ahead symbol in _________ .

2 / 50

An important component of semantic analysis is _________ .

3 / 50

In a transition table cells of the table contain the ________ state.

4 / 50

LL(1) parsing is called non-predictive parsing.

5 / 50

Yacc contains built-in support for handling ambiguous grammars resulting in _______

6 / 50

Alternative of the backtrack in parser is Look ahead symbol in ______ .

7 / 50

Bottom-up parsers handle a ________ class of grammars.

8 / 50

In DFA minimization we construct one ______ for each group of states from the initial DFA.

9 / 50

____is evaluated to yield a value.

10 / 50

Compilers are sometimes classified as.

11 / 50

Lexical Analyzer generator _______ is written in Java.

12 / 50

In Three-pass compiler ____ is used for code improvement or optimization.

13 / 50

Functions of Lexical analyzer are?

14 / 50

A _______ is a top down parser.

15 / 50

Consider the grammar

16 / 50

One of the core tasks of compiler is to generate fast and compact executable code.

17 / 50

Left factoring is enough to make LL1 grammar

18 / 50

_______ of a two-pass compiler is consists of Instruction selection, Register allocation and Instruction scheduling.

19 / 50

We use ----- to mark the bottom of the stack and also the right end of the input when considering the Stack implementation of Shift-Reduce Parsing.

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_______ algorithm is used in DFA minimization.

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Parser always gives a tree like structure as output

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In predictive parsing table the rows are ___________ .

23 / 50

Optimal registers allocation is an NP-hard problem.

24 / 50

Parser takes tokens from scanner and tries to generate ______ .

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We can get an LL(1) grammar by _______ .

26 / 50

Lexical Analyzer generator _______ is written in Java.

27 / 50

____________avoid hardware stalls and interlocks.

28 / 50

Ambiguity can easily be handled by Top-down Parser Select correct option:

29 / 50

Recursive ____________ parsing is done for LL(1) grammar.

30 / 50

Front end of two pass compiler takes________ as input.

31 / 50

Lexical Analyzer generator _______ is written in Java.

32 / 50

Grammars with LL(1) conflicts can be made LL(1) by applying left-factoring, substitution, and left-recursion removal. Left-factoring takes care of ________conflicts.

33 / 50

Intermediate Representation (IR) stores the value of its operand in ____________ .

34 / 50

NFA is easy to implement as compared to DFA.

35 / 50

Left factoring is enough to make LL1 grammar

36 / 50

In compilation process Hierarchical analysis is also called

37 / 50

In Back End module of compiler, optimal register allocation uses______ .

38 / 50

In DFA minimization we construct one ______ for each group of states from the initial DFA.

39 / 50

In multi pass compiler during the first pass it gathers information about __________ .

40 / 50

The regular expressions a*|b* and (a|b)* describe the _____set of strings.

41 / 50

In PASCAL ___________ represent the inequality test.

42 / 50

Front end of two pass compiler takes________ as input.

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This grammar contains a reduce-reduce conflict. If a DFA states contains both [X → α •, a] and [Y → β •, a], then on input “a” we don’t know which production to reduce with. This is called a reduce-reduce conflict. Usually due to gross ambiguity in the grammar.

44 / 50

Which of the statement is true about Regular Languages?

45 / 50

Consider the grammar

46 / 50

_______ of a two-pass compiler is consists of Instruction selection, Register allocation and Instruction scheduling.

47 / 50

LR parsing _____ a string to the start symbol by inverting productions.

48 / 50

In LL1() parsing algorithm _________ contains a sequence of grammar symbols.

49 / 50

In a transition table cells of the table contain the ________ state.

50 / 50

_______ of a two-pass compiler is consists of Instruction selection, Register allocation and Instruction scheduling.

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