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Shift Reduce Parsing Operations & Example Video Lecture | Compiler Design - Computer Science Engineering (CSE)
FAQs on Shift Reduce Parsing Operations & Example Video Lecture - Compiler Design - Computer Science Engineering (CSE)
| 1. What are shift-reduce parsing operations? |  |
Ans. Shift-reduce parsing operations are actions performed in bottom-up parsing, where the parser shifts input symbols onto the stack or reduces a set of symbols on the top of the stack to a single non-terminal symbol.
| 2. How does shift operation work in shift-reduce parsing? | |
Ans. In shift operation, the parser shifts the next input symbol onto the stack. This means that the parser consumes the input symbol and pushes it onto the stack, moving the input pointer to the next symbol.
| 3. What is reduce operation in shift-reduce parsing? | |
Ans. In reduce operation, the parser replaces a set of symbols on the top of the stack with a single non-terminal symbol. This reduction follows a production rule of the grammar and helps to simplify the stack by reducing multiple symbols to a single non-terminal.
| 4. Can you provide an example of shift-reduce parsing? | |
Ans. Sure! Let's consider the following example:
Grammar:
1. S -> E
2. E -> E + T
3. E -> T
4. T -> int
Input: int + int
Stack Input Action
----------------------------------------------
$ int + int Shift
$ int + int Reduce T -> int
$ T + int Reduce E -> T
$ E + int Shift
$ E + int Shift
$ E + int Reduce T -> int
$ E + T Reduce E -> E + T
$ E Reduce S -> E
| 5. What is the purpose of shift-reduce parsing? | |
Ans. The purpose of shift-reduce parsing is to build a parse tree or an abstract syntax tree from a given input string based on a given grammar. It helps in determining the syntactic structure of the input string and identifying any syntax errors. Shift-reduce parsing is commonly used in programming language compilers and syntax analyzers.
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