Requirement #2: Interface

Your submission MUST use a GUI. It doesn't have to be fancy. Heck, it could be the exact GUI we provide for you.

Option 1: Use Our Interface

Option 2: Build Your Interface

If you opt to create your own interface, keep in mind that it must be entirely mouse-driven. It may require left and right clicks, but nothing beyond that (e.g. no scrollwheels, middle-click).

Your calculator must display calculation results on-screen.

All commands must be entered using the same process as entry in a standard calculator. By this we mean that to enter the number “23,” the user would first enter “2,” then “3.” Likewise, “23 + 47 =” means entering “2,” “3,” “+,” “4,” “7,” then “=.”

Test Cases »