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Construction of large numbers+-*/computing and test category. <br> 1. Not consider brackets <br> 2. Input data for the maximum length of 40, it is necessary to catch the exception <br> 3. Do not consider the importation of the fractional part, <br> 4. The test to complete, enter both the number of output above the results of both the number of computing <br> 5. Required output and the balance