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unlike c c and java fortran generally ignores blanks and therefore may need extensive look ahead to determine how to
most compilers can produce a source listing of the program being compiled this listing is usually just a copy of the
when a compiler is first designed and implemented it is wise to concentrate on correctness and simplicity of design
define a token class almost reserved to be those identifiers that are not reserved words but that would be if a single
the algorithms in figures 48 and 411 compute firstalpha and followaa modify the algorithm in figure 48 to compute
let g be an unambiguous cfg without lambda-productionsa ifnbspxnbspnbsplg show that the number of steps needed to
the algorithm presented in figure 48 retains no information between invocations of first as a result the solution for a
a cfg is reduced by removing useless terminals and productions consider the following two tasksa nonterminals not
show that regular grammars and finite automata have equivalent definitional power by developinga an algorithm that
10-701 machine learning - spring 2012 - problem set 2q1 logistic regression 11 logistic vs linear regression-in both
considernbspnnbspoptional symbols x1nbspxnnbspas described in exercise 11a devise a cfg that generates any subset of
section 43 describes extended bnf notation for optional and repeated symbol sequences suppose thenbspnnbspgrammar
as discussed in section 43 the algorithm in figure 44 could use left or right-recursion to transform a repeated
a grammar for infix expressions followsa show the leftmost derivation of the following stringb show the rightmost
what are the difficulties associated with constructing a grammar whose generated strings are decimal representations of
an ambiguous grammar can produce two distinct parses for some string in the grammaramp39s language explain why an
10-701 machine learning - spring 2012 - problem set 1q1 basic probability and statistics 11 probability
show the two distinct parse trees that can be constructed for if expr then if expr then other else other using the
run your solution to exercise 7 through any ll1 parser generator to verify that it is actually ll1 how do you know that
section 594 describes an error recovery method that relies on dynamically constructed sets of follow symbols compare
section 593 contains an example where the production ararr lambda is applied using an invalid look ahead token with
a sparse array can be represented as a vector of rows with each row represented as anbsplistnbspof nondefault column
apply the table compression algorithm in figure 522 to the table shown in figure 520 presenting rows in the order 1 5 2
section 57 and exercises 16 and 17 examine the efficiency of ll1 parsersa analyze the efficiency of operating a
normally an lr parser traces a rightmost derivation in reversea how could an lr parser be modified to produce a