Description: A lexeme is a basic unit of meaning in a programming language, representing the most elemental form of a word or symbol that has a specific meaning. In the context of programming languages, lexemes are fundamental components that the language interpreter uses to understand and execute code. Each lexeme can be a keyword, an identifier, a literal, or an operator. For example, in the expression ‘let x = 10;’, the lexemes include ‘let’, ‘x’, ‘=’, ’10’, and ‘;’. These elements are essential for the language’s syntax and allow the code to be interpreted correctly. Lexemes are generated from the lexical analysis process, where the source code is broken down into its constituent parts, thus facilitating its understanding and execution. Correct identification and use of lexemes are crucial to avoid syntax errors and ensure that the code functions as expected. In summary, lexemes are the foundation upon which instructions and structures in programming languages are built, and understanding them is vital for any developer looking to write effective and efficient code.
