Description: Needs analysis (1) an expression by any operand, operator, and at the composition of the boundaries, we call words. (2) the expression for the value of the first four operations to comply with the rules: ① first multiplication and division, after From left to right to conduct operations by ② ③ first brackets, the brackets after the outside (3) functions: ① If the current word number string, then pressed into numerical stack ② If the current word is greater than for the operator and operator of Top-stack symbols, then into the stack word ③ If the current operator and is equivalent to computing the Top-stack symbols, to brackets, output ④ If the current word for the operator and less than computing the Top-stack symbols, were carried out in computing
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