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What is the similarity between LR, LALR and SLR?
- a)Use same algorithm, but different parsing table.
- b)Same parsing table, but different algorithm.
- c)Their Parsing tables and algorithm are similar but uses top down approach.
- d)Both Parsing tables and algorithm are different.
Correct answer is option 'A'. Can you explain this answer?
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What is the similarity between LR, LALR and SLR?a)Use same algorithm, ...
The common grounds of these 3 parser is the algorithm but parsing table is different
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What is the similarity between LR, LALR and SLR?a)Use same algorithm, ...
Similarity between LR, LALR, and SLR
Algorithmic approach and Parsing Table
LR, LALR, and SLR are all parsing techniques used in compiler design. These techniques share a common algorithmic approach, but differ in their parsing tables. The similarity between LR, LALR, and SLR is that they use the same algorithm but have different parsing tables.
Algorithmic approach
- The parsing algorithm used by LR, LALR, and SLR is called the shift-reduce parser.
- This algorithm is a bottom-up parser, which means that it starts with the input symbols and builds the parse tree from the bottom up.
- The shift-reduce parser consists of two actions: shift and reduce.
- The shift action moves the input symbol to the stack, while the reduce action applies a production rule to the symbols on the stack.
Parsing Table
- The parsing table is a data structure that the parser uses to decide which action to take.
- It contains information about the states of the parser and the symbols that can appear on the stack or as input.
- The parsing table is constructed by analyzing the grammar of the input language.
- The parsing table is different for each parsing technique, which is why LR, LALR, and SLR have different parsing tables.
Conclusion
In conclusion, LR, LALR, and SLR are similar in that they use the same algorithmic approach, but differ in their parsing tables. The parsing table is a data structure that the parser uses to decide which action to take, and it is different for each parsing technique.
Algorithmic approach and Parsing Table
LR, LALR, and SLR are all parsing techniques used in compiler design. These techniques share a common algorithmic approach, but differ in their parsing tables. The similarity between LR, LALR, and SLR is that they use the same algorithm but have different parsing tables.
Algorithmic approach
- The parsing algorithm used by LR, LALR, and SLR is called the shift-reduce parser.
- This algorithm is a bottom-up parser, which means that it starts with the input symbols and builds the parse tree from the bottom up.
- The shift-reduce parser consists of two actions: shift and reduce.
- The shift action moves the input symbol to the stack, while the reduce action applies a production rule to the symbols on the stack.
Parsing Table
- The parsing table is a data structure that the parser uses to decide which action to take.
- It contains information about the states of the parser and the symbols that can appear on the stack or as input.
- The parsing table is constructed by analyzing the grammar of the input language.
- The parsing table is different for each parsing technique, which is why LR, LALR, and SLR have different parsing tables.
Conclusion
In conclusion, LR, LALR, and SLR are similar in that they use the same algorithmic approach, but differ in their parsing tables. The parsing table is a data structure that the parser uses to decide which action to take, and it is different for each parsing technique.
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