Jac is a simple calculator that can be run in the console or with a GUI. Skins based on the OYOAHA framework may be applied to the GUI. The GUI also displays past operations and it can save sessions to a file. All operations are performed using infix notation only. Exponents and roots are supported. Console mode is good for situations where you may need a calculator in your scripting. Version 1.1.232 correct program logging operation at the command-line, revised help information.