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Consider the following translation scheme. S → ER R → *E{print("*");}R | ε E → F + E {print("+");} | F F → (S) | id {print(id.value);} Here id is a token that represents an integer and id.value represents the corresponding integer value. For an input '2 * 3 + 4', this translation scheme prints
- a)2 * 3 + 4
- b)2 * +3 4
- c)2 3 * 4 +
- d)2 3 4+*
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the following translation scheme. S → ER R → *E{p...
Background Required to solve the question - Syntax Directed Translation and Parse Tree Construction.
xplanation : We are given L-Attributed Syntax Directed Translation as semantic actions like printf statements are inserted anywhere on the RHS of production (R → *E{print(“*”);}R). After constructing the parse tree as shown below from the given grammar, we will follow depth first order left to right evaluation in order to generate the final output.
Parse Tree:
Just follow the arrows in the picture (This is actually Depth first left to right evaluation) and the moment we take exit from any child which is printf statement in this question, we print that symbol which can be a integer value or ‘*’ or ‘+’.
Evaluation :
Most Upvoted Answer
Consider the following translation scheme. S → ER R → *E{p...
Explanation:
The given translation scheme represents a grammar for a simple arithmetic expression language. This grammar consists of non-terminal symbols (S, E, F) and terminal symbols (ER, *, (, ), id).
The translation scheme defines the translation rules for each non-terminal symbol. Let's analyze the translation rules one by one.
Translation Rule 1: S ER R *E{print(*);}R
This rule states that when S is encountered, it should be followed by ER and R. The translation for this rule is to print the result of the expression E followed by the string " * ", and then recursively apply the translation rule for R.
Translation Rule 2: E F E {print( );}
This rule states that when E is encountered, it should be followed by F and E. The translation for this rule is to print the result of the expression F followed by a space, and then recursively apply the translation rule for E.
Translation Rule 3: F F (S)
This rule states that when F is encountered, it should be followed by F and (S). The translation for this rule is to recursively apply the translation rule for F, followed by the translation for (S).
Translation Rule 4: id {print(id.value);}
This rule states that when id is encountered, it should be followed by the string " {print(id.value);} ". The translation for this rule is to print the value of the id.
Now let's apply the translation scheme to the given input: 2 * 3 4.
1. Start with the non-terminal symbol S.
2. Apply the translation rule S ER R *E{print(*);}R.
3. Print the result of the expression E (which is 2) followed by " * ".
4. Apply the translation rule R.
5. Apply the translation rule E F E {print( );}.
6. Print the result of the expression F (which is 3) followed by a space.
7. Apply the translation rule E F E {print( );}.
8. Print the result of the expression F (which is 4) followed by a space.
9. Apply the translation rule E F E {print( );}.
10. No more non-terminal symbols to expand.
11. The final output is "2 * 3 4".
Therefore, the correct answer is option 'D', which is "2 3 4 *".
The given translation scheme represents a grammar for a simple arithmetic expression language. This grammar consists of non-terminal symbols (S, E, F) and terminal symbols (ER, *, (, ), id).
The translation scheme defines the translation rules for each non-terminal symbol. Let's analyze the translation rules one by one.
Translation Rule 1: S ER R *E{print(*);}R
This rule states that when S is encountered, it should be followed by ER and R. The translation for this rule is to print the result of the expression E followed by the string " * ", and then recursively apply the translation rule for R.
Translation Rule 2: E F E {print( );}
This rule states that when E is encountered, it should be followed by F and E. The translation for this rule is to print the result of the expression F followed by a space, and then recursively apply the translation rule for E.
Translation Rule 3: F F (S)
This rule states that when F is encountered, it should be followed by F and (S). The translation for this rule is to recursively apply the translation rule for F, followed by the translation for (S).
Translation Rule 4: id {print(id.value);}
This rule states that when id is encountered, it should be followed by the string " {print(id.value);} ". The translation for this rule is to print the value of the id.
Now let's apply the translation scheme to the given input: 2 * 3 4.
1. Start with the non-terminal symbol S.
2. Apply the translation rule S ER R *E{print(*);}R.
3. Print the result of the expression E (which is 2) followed by " * ".
4. Apply the translation rule R.
5. Apply the translation rule E F E {print( );}.
6. Print the result of the expression F (which is 3) followed by a space.
7. Apply the translation rule E F E {print( );}.
8. Print the result of the expression F (which is 4) followed by a space.
9. Apply the translation rule E F E {print( );}.
10. No more non-terminal symbols to expand.
11. The final output is "2 * 3 4".
Therefore, the correct answer is option 'D', which is "2 3 4 *".
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Consider the following translation scheme. S → ER R → *E{print("*");}R | ε E → F + E {print("+");} | F F → (S) | id {print(id.value);} Here id is a token that represents an integer and id.value represents the corresponding integer value. For an input '2 * 3 + 4', this translation scheme printsa)2 * 3 + 4b)2 * +3 4c)2 3 * 4 +d)2 3 4+*Correct answer is option 'D'. Can you explain this answer?
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