|Erik Østergaard - Four Function RPN (Reverse Polish Notation) Calculator / Fire funktions RPN regnemaskine|
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This calculator uses postfix notation, and works a little differently from calculators you may have used. Suppose you want to add two numbers. Enter the first number. Press "Enter." This commits the first number into the calculator's memory. Then enter the second number. After that, enter the type of operation (such as "+") that you wish to perform. Use only the period (.) as a valid decimal separator.