Text Based Calculator with C++

Hi! I started to learn C++ at my department last week. I've taken only one course about this. So I'm a beginner, namely I can do some mistakes because of the lack of knowledge. But I believe I will improve myself about this branch.

 Let's start some examples. This is a simple text based calculator programmed with basic C++ knowledge. Only few functions were used as you see. It's formed with almost the same forms repeatedly. It might hold some logical problems, or unnecessary codes. As already stated, this is my first C++ project. So it definitely should be improved.