Reverse Polish notation

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Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands (e.g. 3 4 + {\displaystyle 3\ 4\ +} ), in contrast to the more common infix notation (in which operators are placed between operands, e.g. 3 + 4 {\displaystyle 3+4} ), as well as prefix notation (in which operators precede their operands, e.g. + 3 4 {\displaystyle +\ 3\ 4} ). The notation does not need any parentheses as long as each operator has a fixed number of operands. Here are some examples to illustrate the differences between the aforementioned types of notation: The term postfix notation describes the general scheme in mathematics and computer sciences, whereas the term reverse...

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