Description: PASCAL language subset of the source defined in the following paragraphs as input data for the lexical analyzer. The lexical analyzer to open the file from the file header, scan the source character and found to comply with the definition of the word "source string, it is translated into fixed-length word internal, said check and fill in appropriate information table, found that does not meet the definition of "words" of the source string, given the error. After lexical analysis, the source string (the external representation of a source) has been translated into the word with a long message string (the internal representation of the source), and produce two forms: the constant table and the identifier table, and they contain all constants in the source and all identifiers.
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ss.c
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