Calculations Implement simple calculations (+, -, *, /, % (mod)). At the very least, you should be able to perform each of these math operations on two numbers. (2+2 should work, but 2+2+2 does not need to just yet). Review string parsing concepts to tokenize the string in your textbox into separate tokens. If "5.5*-20" is in your textbox, pressing = should parse "5.5" and "-20" as floating point values and "*" as the operation to occur between those two values. There are several ways to do this. wxWidgets comes with it's own wxStringTokenizer that you may use. You also have the option to make your own tokenizer, but this is not recommended for this assignment. Simple unary operations (Sin, Cos, Tan) should also be implemented. Pressing Sin and 5 should add "Sin 5" to your textbox, and pressing = should result in the Sine of 5. Unary operations should still be added as a string to your text box. Do not immediately evaluate numbers in your textbox. The equals button should still be pressed in order to evaluate any expressions, including unary operations. Try to find a way to implement the event table without having everything hardcoded. You should