Hopefully though you weren't going to be finished with this right?

A little cleaning and possibly more user friendly controls would help a lot

here are some suggestions

1) All of the ifs should be a switch (case) structure

2) Put the data accept inside of a while statement to prevent incorrect data entry
   (such as they enter P for 'plus' we have to ASSUME people are dumber than rocks)

3) Organize your instructions in the begining to create a clean appearance

4) Make your instructions verified ex : you said hold shift and enter a letter in caps but what if they have caps lock on and they enter a value while holding shift?

5) Regarding the caps only you can make the input data accept upper and lower case

6) I would probably use symbols for the operation identifier and present it to them

7) Create a more explanative output
   ex :
   =4
   that works but you should restate everything
   2 * 2 = 4
   see . . . thats what the user wants to see

8) Prompt for another math function
   ex:
   2 * 2 = 4
   would you like to perform another math operation?

9) possibly add more than those four math operations

Follow these and your program will be awesome beyond belief =P

Sorry if I seemed a little harsh

I am just trying to give you a hand in making the best program you can

~ Geo

 ~ You are unique, just like everyone else