Description: Design a simple calculator-type (type), requirements: (1) Reading from the keyboard into the formula. (2) can add, subtract, multiply, with the exception of computing. (3) The operator must have priority. (4) the user can press any of the emergence of the order of operator input. (5) does not limit the user to enter the length of the calculation formula. (6) have debugging function, when the user enters the wrong formula when prompts the user. For example, if a user enters: 3+ 4* 5- 7, the calculation results should be 16. (Hint: You can use this section of the stack type definition to help to deal with).
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