I just gave you another '5' for your enthusiasm and the ability to produce a workable program. You can use better file names/class names and use proper conventions naming the resource identifiers for example.
Just a thought, when I write my first calculator program, I was not not happy at that time with so many functions I have to add for every button. I liked to write concise code. I used ON_CONTROL_RANGE to write a single function for all the numberical buttons and used their labeled text to find out what is pressed. You don't need to do it that way but sometimes exercize like becomes a good programming lessons. At least it makes it a little more challenging to wrok on.