Is a simple calculator! I can be used where we have an number input for an user and the user can put a formula, but the app only gets a i64 or a f64 and if has a error you can display an error at the user, but errors are english only!
Only supports:
And groups like: 2 * (2 - 1) = 2
But +,-,*,/ are not in the math order for now!