CustomCalc offers two input modes: Algebraic, or RPN (as in the HP's calculators 12C, 15C 48G and 48GX).
RPN: Using the logic RPN system, CustomCalc is a perfect replacement for HP calculators, with the most sophisticated functions easier to use, with the four stack values on the display.
Algebraic: Algebraic input mode uses the parenthesis and the equal sign. It considers the operator precedence, thus 2 + 3 * 4 will give a result of 14.
Algebraic mode will display complex sentences in a long scrollable line, with intermediate results in the bottom line.
