Type an expression or assignment and press Return or Enter.
The world may not have needed yet another calculator, but I wrote this while playing with the Spirit parsing Library, and maybe some people will find it useful. PlainCalc is a buttonless, algebraic-entry, mathematical calculator with variables.
To use PlainCalc, type an expression or assignment and press Return or Enter. Unlike most calculators I've seen, PlainCalc allows you to indicate multiplication by juxtaposition, e.g., you can write 2πr instead of 2*π*r.
New in version 2 of PlainCalc: You can define your own functions, and you can save worksheets, including values of variables and functions. Version 2 requires OS 10.3.9 or later. This version was built as a universal binary.
Version 2.0.1 fixes a bug in which a built-in function stopped working if you defined a variable whose name was an initial segment of the function name. For instance, a variable c interfered with the function cos.