Computer programming

Prefix notation has seen wide application in Lisp s-expressions, where the brackets are required due to the arithmetic operators having variable arity. The Ambi programming language uses Polish Notation for arithmetic operations and program construction. The postfix reverse Polish notation is used in many stack-based programming languages like PostScript and Forth, and is the operating principle of certain calculators, notably from Hewlett-Packard.
The number of return values of an expression equals the difference between the number of operands in an expression and the total arity of the operators minus the total number of return values of the operators.
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