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A lexical analyzer, also called a scanner, is the first phase of a compiler. Its job is to read the raw source code (a sequence of characters) and convert it into a sequence of tokens. Tokens are the meaningful building blocks of a programming language, such as keywords, identifiers, operators, literals, and punctuation. For example, the code int x = 10; would be broken into tokens like [int] [x] [=] [10] [;].

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