Specification of Tokens A token is a specific sequence of characters that represents a meaningful unit of information in a programming language. A token...
Specification of Tokens
A token is a specific sequence of characters that represents a meaningful unit of information in a programming language. A token can be a keyword, identifier, operator, punctuation mark, or any other recognized element.
Types of Tokens:
Keywords: Reserved words like if, int, float, class, etc.
Identifiers: Names used to refer to variables, functions, and other objects.
Operators: Symbols used to perform operations, such as addition, subtraction, comparison, etc.
Punctuation: Marks used to separate different elements in a string, such as commas, semicolons, colons, etc.
Specification:
The specification of tokens defines the set of all valid tokens that can be encountered during the lexical analysis phase of compiler design. It includes a clear and consistent definition of each token type, along with rules for determining which characters belong to each category.
Examples:
Keyword: if
Identifier: age
Operator: +
Punctuation: ,
Importance of Specification:
The specification of tokens is crucial for the compiler because it provides a clear and consistent guide for the parser, which is responsible for recognizing and interpreting the source code. The specification allows the parser to accurately identify and handle all the tokens in the input stream, enabling the compiler to perform the necessary operations and generate an executable program