CONSTANTS :

apple-K, because we all know that Constant begins with K. To write in constants for replacement by the calculator, use # followed by all lowercase letters, when the lowercase letters stop, that constant is submitted for lookup. You can separate with spaces if necessary. For example, #piR^2 is legal as R is uppercase. #pi sin(30) is also valid. 3#pi3 would give you a result equal to 9*#pi. #e, can be used to grab e, which is no different form _exp 1. (e^1) But there are your choices.

The window allows you to play around, and remember constants to see if they are useful. To append the value of a constant to the end of what's currently in the calculator's editField, click the painfully obvious append button. Hitting enter should work as well. The constants list may take a moment to appear when requested as the menu is built from a file on the hard drive at the first request for a constant.

The file within the application is a plist, an XML formatted list of pairs, which you can edit if you so desire. "Calc Thingy/constants.plist" I strongly encourage you to use a plist editor for doing so, as manually tracking the syntax can be very tedious, and thusly error prone. No spaces, all lower case for constant names please. I may move to a hierarchical format for constants if I find that having crazy lots of them is useful.