Description: Expressions evaluate to the form of a sequence of characters from the terminal input grammar correct, non-variable expression data. Table 3.1 using the textbook are given priority to the relationship between the operator, to achieve four mixed computing arithmetic expression evaluation and follow the textbook example of the value of 3-1 in the demonstration in order to stack operator, computing the number of stacks, enter the characters and the main operation The process of change.
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