Question

When the lexical
analyzer and parser
are in the same pass,
the lexical analyzer
acts as a​

Answer 1

Answer:

LEXICAL ANALYSIS is the very first phase in the compiler designing. A Lexer takes the modified source code which is written in the form of sentences . In other words, it helps you to convert a sequence of characters into a sequence of tokens. The lexical analyzer breaks this syntax into a series of tokens. It removes any extra space or comment written in the source code.

Answer 2

Answer:

The lexical analyzer and parser are in the same pass, the lexical analyzer acts as a​ interface between the source program and the rest of the phases of compiler.

Explanation:

A lexical analyzer serves as an interface between the source program and the remaining phases of the compiler during the lexical analysis phase, which is the first phase of a compiler.

• It extracts a sequence of tokens for each lexeme after reading the source program's input characters, classifying them into lexemes.

• The parser is then used to analyze the syntax of the tokens.
• Lexical analysis would need an intermediate file to store its output if it were included as a separate pass in the compiler, from which the parser would then draw its input.

• Lexical and syntactic analyzers (parsers) are frequently combined into one pass in order to do away with the need for the intermediate file.
• Reading input characters from the code and creating tokens is the primary goal of lexical analysis. The lexical analyzer receives the command "Get next token" from the parser. On receiving this command, the lexical analyzer scans the input until it finds the next token. It gives the token back to the parser.