Beginner calculator. Need new ideas.

[rondoR]

So I started learning C++ yesterday and now Im looking for something to do. I made this shitty calculator I know there is better ways to do this but this is all I can do after 1 day. Can someone help me to make this better and/or give me some easy ideas to do?

This is the calculators code: http://pastebin.com/Q9KNvje4

[koothkeeper]

This is a great place to start: http://www.cplusplus.com/forum/articles/12974/