Description: First, the purpose and requirements for experimental purposes: the analysis of a teaching-oriented compiler to understand (such as PL/0), based on its lexical analyzer, parser and semantic processing to expand a partial modification. Compiled to learn more about the process of realization of basic principle and purpose. Requirements: The PL/0 expansion of the basic content of the following modifications: increase the word: reserved word ELSE, FOR, TO, DOWNTO, RETURN operator+=,-=,++,-- modify words: inequality# to < > to increase The ELSE clause of conditional statement
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