Description: operator priorities under formal algorithm, the development process of achieving a priority analyzer operator, to the right common arithmetic expressions statement for analysis. Call for the following functions : a) Organization arithmetic expression input; 2) Organizational operator precedence relations priority table or function input; 3) if the input string is a symbol arithmetic expression statement, Output is a skeleton tree analysis (both used in every step of the Statute of the most left-phrase), or output an error message.
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