The above code can solve similar ((567-56) * 8 / 9-3) * 6-54 ^ 4 and other very expressions, can also be parsed as needed, such as the items described above (notebook ) Calculation of price expressions, but is not common. For example: How to let the program automatically resolve and calculate the product name "Cup" (expression may be based on the user's needs, the need for thousands of different payable) calculation expressions?
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