The Programmers Calculator

# Supports a rich expression format, which is in most cases identical to what you would type in your programming language.
# Support for adding unlimited numbers of variables.
# Built-in debugger that lets you see the expression simplified step by step.
# Debugger Back-step lets you backup as many steps as you like so that you can replay critical operations.
# C/C++ operator precedence
# Mouse optional, all calculator commands and functions can be done using the keyboard alone.
# Mini-Calc Mode lets your calculator take up very little screen real estate, and yet remain entirely usable.