Test: Parsing Techniques- 1 - Computer Science Engineering (CSE) MCQ

Syntax analysis checks for the syntax of the source program while the semantic analysis, deals with checking of semantic (meaning) of the source program output by syntax analysis phase and input to semantic analysis phase.
Note: The syntax checking is responsibility of the programmer while semantic analys is is checked at the runtime.

- Correct Answer: D: Prefixed of alternates

- Explanation:
- Left factoring is used in grammar to make parsers deterministic.
- It involves identifying common prefixes in different alternatives of a production rule.
- By factoring out these prefixes, the grammar becomes easier to parse using predictive parsers.
- This process helps in removing ambiguity and non-determinism, leading to more efficient parsing.

Rules of operator precedence grammar is given as:
1. It must not contain any null-production.
2. It must not contain two adjacent non-terminal symbols.

If compiler automatically converts one type of from to another type then it is called implicit conversion or coercions, else if not done automatically, then it is called explicit conversion.

Top down parser uses left to right, left most derivation.

The canonical LR parser is the most powerful parser that can recognize more grammars than other parsers.

Bottom-up parsing recognizes the text’s lowest level small details first, before its mod-level structures and leaving the highest-level overall structure to last. It is some times done by backtracking and much more commonly by a shift-reduce parser such as LALR parser.

Top-down parsing is the parsing strategy which one first looks at the highest level of the parse tree and works down the parse tree by using the rewriting rules of formed grammar. LL parsers are the parsers that the top-down parsing strategy.

If we create LL (1) items, we will find out that (a) and (b) both are LR(1).

CLR > LALR > SLR