Reverse Polish notation (RPN), also known as reverse Lukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands. The notation does not need any parentheses for as long as each operator has a fixed number of operands.

Clicking on the green output will show you how it was calculated. Other functions are "pop" to delete the last number in the stack, "clear" to clear the stack and "stack" to display the stack.

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