Clear: This button removes all the elements from the stack.
Delete: This button removes the most recently added element.
Swap: This button will swap the most recently added element and the previous element.
Flip: This button will flip the stack from the topmost element selected to the bottom.
Float: This button will raise the selected element by one.
Sink: This will lower the selected element by one.
Roll: This will move the every element in the stack down one from the element selected and place the bottom most element just above in the place of the selection.
Undo: This button will undo the most recent operation, entry, or stack manipulation.
Cancel: This will cancel an entry one begun so that an operation will operate on the stack and not the incorrect number entry.
Backspace: This will backspace the last digit of the number entry.
Exponential Notation : This will allow the number to be entered in exponential or scientific notation.
(): Inserts parentheses at the appropriate places for complex number entry.
,: Insert a comma for complex number entry.
(x,y): Creates a complex number from the last two elemnts in the stack.