Description: To implement the lexical analysis program of a subset of C language.
First, query the string p in the keyword list keywordtable, and if it exists, insert the string and the corresponding class number into the binary list eryuanshi; If no, in symtable symtable symtable, if p is not present in symtable, p will be inserted, which is whether p is an identifier or an integer is treated differently, and different type values are set.
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