MCQ IN COMPUTER SCIENCE & ENGINEERING

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COMPUTER SCIENCE AND ENGINEERING

COMPILER DESIGN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The character sequence forming a token is called as ____
A
pattern
B
symbol
C
lexeme
D
input
Explanation: 

Detailed explanation-1: -A lexeme is an actual character sequence forming a specific instance of a token, such as num. Pattern: A rule that describes the set of strings associated to a token. Expressed. as a regular expression and describing how a particular token can be formed.

Detailed explanation-2: -Lexeme. A lexeme is a sequence of characters in the source program that matches the pattern for a token and is identified by the lexical analyzer as an instance of that token.

Detailed explanation-3: -LEXEME-Sequence of characters matched by PATTERN forming the TOKEN. PATTERN-The set of rule that define a TOKEN. TOKEN-The meaningful collection of characters over the character set of the programming language ex:ID, Constant, Keywords, Operators, Punctuation, Literal String.

Detailed explanation-4: -Detailed Solution. Lexeme: A lexeme is a sequence of characters in the source program that is matched by the pattern for a token.

Detailed explanation-5: -Explanation: A lexeme is a string of characters that form a syntactic unit. It is reasonable to say that is the sequence of alphanumeric characters in a token.

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