Parsing

Consider the following augmented grammar with \{ \#, @, <, >, a, b, c \} as the set of terminals.

\begin{array}{l} S' \rightarrow S \\ S \rightarrow S \# cS \\ S \rightarrow SS \\ S \rightarrow S @ \\ S \rightarrow < S > \\ S \rightarrow a \\ S \rightarrow b \\ S \rightarrow c \end{array}

Let I_0 = \text{CLOSURE}(\{S' \rightarrow \bullet S\}). The number of items in the set \text{GOTO(GOTO}(I_0 \lt ), \lt ) is ___________

Consider the following C code segment:

a = b + c;
e = a + 1;
d = b + c;
f = d + 1;
g = e + f;

In a compiler, this code segment is represented internally as a directed acyclic graph (DAG). The number of nodes in the DAG is _____________

Consider the following statements.

S1: Every SLR(1) grammar is unambiguous but there are certain unambiguous grammars that are not SLR(1).
S2: For any context-free grammar, there is a parser that takes at most O(n^3) time to parse a string of length n.

Which one of the following options is correct?

A grammar is defined as
A \rightarrow B C
B \rightarrow x \mid B x
C \rightarrow B \mid D
D \rightarrow y \mid Ey
E \rightarrow z
The non terminal alphabet of the grammar is

A given grammar is called ambiguous if

Given the grammar
s \rightarrow T^{*} S \mid T
T \rightarrow U+T \mid U
U \rightarrow a \mid b
Which of the following statements is wrong?

Consider the following grammar.

S\rightarrow aSB|d
B\rightarrow b

The number of reduction steps taken by a bottom-up parser while accepting the string aaadbbb is___________.

Consider the augmented grammar given below:
S'\rightarrow S
S \rightarrow \lt L \gt |id
L \rightarrow L,S|S

Let I_0=CLOSURE(\{[S'\rightarrow \cdot S]\}) . The number of items in the set GOTO(I_0,\lt) is __________.

Consider the following given grammar:

 
S \rightarrow Aa
A \rightarrow BD
B \rightarrow b|\epsilon
D \rightarrow d|\epsilon 

Let a, b, d and $ be indexed as follows:

Compute the FOLLOW set of the non-terminal B and write the index values for the symbols in the FOLLOW set in the descending order. (For example, if the FOLLOW set is {a, b, d, $}, then the answer should be 3210).
Answer:_____

Which one of the following kinds of derivation is used by LR parsers?