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A top down parser generates
- a)Rightmost Derivation
- b)Right most derivation in reverse
- c)Left most derivation
- d)Left most derivation in reverse
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A top down parser generatesa)Rightmost Derivationb)Right most derivati...
Explanation: Top-down parsing is a parsing strategy where one first looks at the highest level of the parse tree and works down the parse tree by using the rewriting rules of a formal grammar.
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A top down parser generatesa)Rightmost Derivationb)Right most derivati...
Understanding Top-Down Parsing
Top-down parsing is a method of syntax analysis used in compilers and interpreters to derive a string from a grammar. This approach starts from the root of the parse tree and works its way down to the leaves.
Rightmost vs. Leftmost Derivation
- Rightmost Derivation: This type of derivation always replaces the rightmost non-terminal first.
- Leftmost Derivation: Conversely, this derivation replaces the leftmost non-terminal first.
Why Option 'C' is Correct
- A top-down parser generates Leftmost Derivation because it begins with the start symbol and applies production rules by expanding the leftmost non-terminal at each step.
- This means, in every step of the parsing process, it focuses on the leftmost non-terminal, applying the corresponding production until it reaches the terminal symbols.
Characteristics of Top-Down Parsing
- Recursive Approach: Often implemented using recursive descent, where each non-terminal is represented by a function.
- Predictive Parsing: Utilizes lookahead tokens to determine which rule to apply next, commonly seen in LL parsers.
Significance of Leftmost Derivation
- Clarity: Leftmost derivation provides a clear path of how the string is derived from the grammar.
- Error Detection: Helps in identifying syntax errors early during the parsing process.
In summary, a top-down parser generates the leftmost derivation, making option 'C' the correct answer. This method is integral to many parsing techniques in compiler design, ensuring an organized approach to understanding and translating programming languages.
Top-down parsing is a method of syntax analysis used in compilers and interpreters to derive a string from a grammar. This approach starts from the root of the parse tree and works its way down to the leaves.
Rightmost vs. Leftmost Derivation
- Rightmost Derivation: This type of derivation always replaces the rightmost non-terminal first.
- Leftmost Derivation: Conversely, this derivation replaces the leftmost non-terminal first.
Why Option 'C' is Correct
- A top-down parser generates Leftmost Derivation because it begins with the start symbol and applies production rules by expanding the leftmost non-terminal at each step.
- This means, in every step of the parsing process, it focuses on the leftmost non-terminal, applying the corresponding production until it reaches the terminal symbols.
Characteristics of Top-Down Parsing
- Recursive Approach: Often implemented using recursive descent, where each non-terminal is represented by a function.
- Predictive Parsing: Utilizes lookahead tokens to determine which rule to apply next, commonly seen in LL parsers.
Significance of Leftmost Derivation
- Clarity: Leftmost derivation provides a clear path of how the string is derived from the grammar.
- Error Detection: Helps in identifying syntax errors early during the parsing process.
In summary, a top-down parser generates the leftmost derivation, making option 'C' the correct answer. This method is integral to many parsing techniques in compiler design, ensuring an organized approach to understanding and translating programming languages.
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A top down parser generatesa)Rightmost Derivationb)Right most derivation in reversec)Left most derivationd)Left most derivation in reverseCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about A top down parser generatesa)Rightmost Derivationb)Right most derivation in reversec)Left most derivationd)Left most derivation in reverseCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A top down parser generatesa)Rightmost Derivationb)Right most derivation in reversec)Left most derivationd)Left most derivation in reverseCorrect answer is option 'C'. Can you explain this answer?.
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