Introduction - If you have any usage issues, please Google them yourself
Interface without a calculator, the user need only enter a text file input.txt expressions, you can get results by running the program, the output in the output.txt support calculation, check the balance, involution, brackets etc. such as: 5+4 = 9 5+4 Output* 4+9/3 = output 24 (5+4)* 4+9/3 = output 39 (50+4)* (40 3)+288/(147-3) = output 56 (50+4) ^ 2* (40 3)+288/(147-3) = output 2918