DaWei

If you aren't familiar with infix (or prefix or postfix) notation and precedence of operations, you should remedy that. Then you will have and idea about how to write your calculator, and people will know how to use it.

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Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code.
Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers