What is the process to construct an unambiguous grammar that cannot be parsed by an LL-parser?
Homework Answers
ll(1) parsing is done from
left to right, performing left most derivation of sentence.it is
top-down parser.
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What is the process to construct an unambiguous grammar that cannot
be parsed by an LL-parser?
LL(1) Parser For the grammar: 1. S --> TT 2. T --> aT 3. T -->...
LL(1) Parser For the grammar: 1. S --> TT 2. T --> aT 3. T --> b Problems Calculate LL(1) parse table Parse string "abab" and construct its parse tree Bonus: Parse string "aabb" and construct its parse tree
(a). Compute the FIRST set for the right-hand side of each rule in the following grammar....
(a). Compute the FIRST set for the right-hand side of each rule in the following grammar. <list> → ( <element-list> ) <list> → ( ) <element-list> → <element> <element-list> <element-list> → <element> <element> → a <element> → b <element> → <list> (b) Modify the grammar so that it can be parsed using an LL parser. Keep the modified grammar as simple and as close to the original grammar as possible.
Question 1. (15 points) Consider the following LL (1) grammar with starting symbol S s→(ST) F...
Question 1. (15 points) Consider the following LL (1) grammar with starting symbol S s→(ST) F → id F → num a) Compute the First and Follow sets of all non-terminals (5 points) b) Construct the LL (1) parsing table for the grammar (5 points) c) Show step-by-step (content of stack and input string, as well as the production taken) how the following string is parsed: ((20+30 + a)) (5 points)
Give an unambiguous grammar for the same language generated by the grammar: <fruit>* : -<yellow» | <red>...
Give an unambiguous grammar for the same language generated by
the grammar:
<fruit>* : -<yellow» | <red> <yellow» banana |mango | <empty> <red> ::- cherry | apple | <empty> "Same language" means that the unambiguous grammar can generate exactly the same set of strings as the ambiguous grammar. No more; no fewer. There will of course be a difference in how - by what NTSs and productions - at least some of those strings are generated
* : -
Please help me with the coding for LL(1)!! The given grammar was: P → PL |...
Please help me with the coding for LL(1)!!
The given grammar was:
P → PL | L
L → N; | M; | C
N → print E
M → print "W"
W → TW | ε
C → if E {P} | if E {P} else {P}
E → (EOE) | V (note: this has a variable O)
O → + | - | * V → 0 | 1 | 2 | 3 (note: this has a terminal...
- 4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. What...
- 4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. What does it print when the input is as follows? ( (1 2 3) (4 5 6 7 8 9) ) $. 1 Start Lista $ 2 Lista! Iparen Operands, paren PRINT(count) Hint 3 2 4 3 3 num 4 Operands-Operands List count count +1 5 List count1
4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. follows? (1...
4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. follows? (1 2 3) (4 5 678 9) $. What does it print when the input is as 1 Start ListeS Iparen Operands rparen PRINT(Count) 2 List.l 3243 I num 3 tuit 4 Operands Operands List count-count+1 I List 5 count-1
4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. follows? (1 2 3) (4 5 678 9) $. What does...
Write a program that constructs the ACTION and GOTO parse tables for an SLR parser. Method...
Write a program that constructs the ACTION and GOTO parse tables for an SLR parser. Method for doing this is algorithm 4.46 (Purple Dragon Book) pg 253, Algorithm 4.8 (Red Dragon Book), pg 227. Algorithm to do this is briefly described in Feb 16 notes, Shift-Reduce parser that uses these tables is described in Feb 9 notes. Once you have the ACTION and GOTO tables, it is easy to construct your own SLR parser. Given your program, construct the SLR...
(10] Eliminate left recursion from the grammar A Ba |Aa c B Bb | Ab 1...
(10] Eliminate left recursion from the grammar A Ba |Aa c B Bb | Ab 1 d A Ad IB A BA ASJAE Consider the following grammar G: S'S S (S)S|e fa) (10] Construct the collection of the sets of LR(0) items (b) [5] When constructing the action table of SLR parser of G what are the rules to determine the parsing actions? That is, what is the rule for a shift action at state /? What is the rule...
Question 35 In a bottom up parser, what does it mean to perform a shift action? Answers: bits are...
Please answer for all 3 questions. Thanks.
Question 35 In a bottom up parser, what does it mean to perform a shift action? Answers: bits are moved n digit positions to the left/right values are popped from the parser's stack the next input token is placed onto the parser's stack lowercase characters are converted to uppercase characters bottom up parsers don't perform shifts, top down parsers do Question 37 What does S represent in LL parser? Answers: dollar sign end...
Question 1. (15 points) Consider the following LL (1) grammar with starting symbol S s→(ST) F → id F → num a) Compute the First and Follow sets of all non-terminals (5 points) b) Construct the LL (1) parsing table for the grammar (5 points) c) Show step-by-step (content of stack and input string, as well as the production taken) how the following string is parsed: ((20+30 + a)) (5 points)
Give an unambiguous grammar for the same language generated by
the grammar:
<fruit>* : -<yellow» | <red> <yellow» banana |mango | <empty> <red> ::- cherry | apple | <empty> "Same language" means that the unambiguous grammar can generate exactly the same set of strings as the ambiguous grammar. No more; no fewer. There will of course be a difference in how - by what NTSs and productions - at least some of those strings are generated
* : -
Please help me with the coding for LL(1)!!
The given grammar was:
P → PL | L
L → N; | M; | C
N → print E
M → print "W"
W → TW | ε
C → if E {P} | if E {P} else {P}
E → (EOE) | V (note: this has a variable O)
O → + | - | * V → 0 | 1 | 2 | 3 (note: this has a terminal...
- 4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. What does it print when the input is as follows? ( (1 2 3) (4 5 6 7 8 9) ) $. 1 Start Lista $ 2 Lista! Iparen Operands, paren PRINT(count) Hint 3 2 4 3 3 num 4 Operands-Operands List count count +1 5 List count1
4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. follows? (1 2 3) (4 5 678 9) $. What does it print when the input is as 1 Start ListeS Iparen Operands rparen PRINT(Count) 2 List.l 3243 I num 3 tuit 4 Operands Operands List count-count+1 I List 5 count-1
4. (Syntax-directed translation) Assume that a bottom-up parser is used for the following grammar. follows? (1 2 3) (4 5 678 9) $. What does...
Write a program that constructs the ACTION and GOTO parse tables for an SLR parser. Method for doing this is algorithm 4.46 (Purple Dragon Book) pg 253, Algorithm 4.8 (Red Dragon Book), pg 227. Algorithm to do this is briefly described in Feb 16 notes, Shift-Reduce parser that uses these tables is described in Feb 9 notes. Once you have the ACTION and GOTO tables, it is easy to construct your own SLR parser. Given your program, construct the SLR...
(10] Eliminate left recursion from the grammar A Ba |Aa c B Bb | Ab 1 d A Ad IB A BA ASJAE Consider the following grammar G: S'S S (S)S|e fa) (10] Construct the collection of the sets of LR(0) items (b) [5] When constructing the action table of SLR parser of G what are the rules to determine the parsing actions? That is, what is the rule for a shift action at state /? What is the rule...
Please answer for all 3 questions. Thanks.
Question 35 In a bottom up parser, what does it mean to perform a shift action? Answers: bits are moved n digit positions to the left/right values are popped from the parser's stack the next input token is placed onto the parser's stack lowercase characters are converted to uppercase characters bottom up parsers don't perform shifts, top down parsers do Question 37 What does S represent in LL parser? Answers: dollar sign end...
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