The Calculator supports the four basic operations (Addition, Subtraction,
Multiplication and Division). It uses floating point numbers with a
maximum precision of 12 digits.
Touchscreen mode
The Calculator provides a simple user interface similar to an electronic pocket calculator -- a set of buttons to enter digits and arithmetic operators, and a single line numeric display.
Keypad mode
The user is able to enter numbers using the number keys on the keypad as
well as choosing one of the four operations by using the direction keys.
Key_Up - Addition
Key Down - Substraction
Key_Right - Multiplication
Key_Left - Division
In addition to the direction keys the user can cycle through
these operations using the # key on the keypad.
The * key provides the decimal point and pressing
the Key_Select button initiates the actual calculation.
Visual history (keypad only)
Calculator presents the history of previous calculations on the screen.
Memory operations (touchscreen only)
The user can access a single number storage via the Store(M+), Clear(MC)
and Retrieve(MR) functions.
Backspace
Touchscreen mode
The user interface provides a Backspace button that deletes the
last character of the current calculation.
Keypad mode
It is possible to delete the last character of the current number as
well as entire numbers from previous calculations by using Backspace.
Holding down the Backspace button exits the calculator
application.
Error messages
Translatable error messages (e.g. Division by zero) are displayed if
the user enters an indefinable calculation.
