1, to form a sequence of characters input from the terminal grammar correct, non-variable expression of the certificate. The use of a certain operator precedence relations and the realization of the four mixed arithmetic expression for computing the value, and value in order to stack operator, computing the number of stacks, input characters and major changes in the course of the operation. 2, set up operator stack operands stack and operator-assisted analysis of the priority. 3, in the time sequence of characters into the expression at the same time, the completion of operator and operator identification numbers, as well as the corresponding arithmetic. 4, in the identification Office operator at the same time, to form the character sequence into the form of an integer. 5, in place procedures for the importation of the operator stack, the number of stack operations, input characters and the main operation of the content.

suanshubiaodashiqiuzhi.c

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