Introduction - If you have any usage issues, please Google them yourself
Rule 1: realize+,-X,/arithmetic, data contain only integer, don t consider the calculation results of the spill
Rule 2: program only need to implement similar "a+ b* c/d-e" this type of string calculation, the number of operators in the mean no more than 10. Other complex condition is not considered.
Example 1:
Input: 1+ 2
Output: 3
Input: 1+ 2* 3-4/2
Output: 5