The Input Box is used to enter expressions to be evaluated.
You can enter and evaluate any natural expressions the Expression Calculator understands. Expressions are evaluated by pressing the Enter (Return) key or by clicking on the Exe button.
Try typing 2 + 2 and pressing Enter. It's as easy as that!
While typing into the Input Box, you can retrieve previously evaluated expressions with the arrow keys on the keyboard. Expression Calculator will take care of properly inserting the expression by adding the necessary parenthesis. You can also copy, paste or undo your typing, just like in any other editor.