postfix notation

Reverse Polish notation (or just RPN) by analogy with the related Polish notation, a prefix notation introduced in 1920 by the Polish mathematician Jan Łukasiewicz, is a mathematical notation wherein every operator follows all of its operands. It is also known as Postfix notation. Reverse Polish notation was invented by Australian philosopher and computer scientist Charles Hamblin in the mid-1950s, to enable zero-address memory stores. Hamblin presented his work at a conference in June 1957, and published it in 1957 and 1962.
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Noun
1. a parenthesis-free notation for forming mathematical expressions in which each operator follows its operands
(synonym) suffix notation, reverse Polish notation
(hypernym) parenthesis-free notation

<language> (Or "Reverse Polish Notation", RPN) One of the possible orderings of functions and operands: in postfix notation the functions are preceded by all their operands. For example, what may normally be written as "1+2" becomes "1 2 +". Postfix notation is well suited for stack based architectures but modern compilers reduced this advantage considerably.
The best-known language with postfix syntax is FORTH. Some Hewlett-Packard calculators use it, e.g. HP-25, HP-29C, HP-41C, HP-23SII.
Compare: infix notation, prefix notation.
(2003-06-23)