A simple lexical analyzer constructed at the beginning of the state, first of all to read into a character. If the read is a space (including the blank, tab, newline) will skip it, and then continue to read characters until the time into a non-empty character so far. In the identifier state, to identify and assemble an identifier, you must also add some actions in order to check a reserved word table to determine the identify of the word symbols are reserved words, or user-defined identifier, and output the corresponding symbol. In the unsigned status, can identify a variety of constants, including the integer included. In the group number, we must also do a number from decimal to binary number conversion.

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