
Alt text: "It looks good, but it needs more postfixins."
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In Reverse Polish notation the operators follow their operands; for instance, to add three and four, one would write "3 4 +" rather than "3 + 4". If there are multiple operations, the operator is given immediately after its second operand; so the expression written "3 − 4 + 5" in conventional infix notation would be written "3 4 − 5 +" in RPN: first subtract 4 from 3, then add 5 to that. An advantage of RPN is that it obviates the need for parentheses that are required by infix. While "3 − 4 * 5" can also be written "3 − (4 * 5)", that means something quite different from "(3 − 4) * 5". In postfix, the former would be written "3 4 5 * −", which unambiguously means "3 (4 5 *) −".
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Beat me 'cause I had to log in...rgoomh wrote:http://en.wikipedia.org/wiki/Reverse_Polish_notation
Very clever, Randall.
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RogerMurdock wrote:Referring to postfix notation, also called Reverse Polish Notation.
http://en.wikipedia.org/wiki/Reverse_Polish_notationIn Reverse Polish notation the operators follow their operands; for instance, to add three and four, one would write "3 4 +" rather than "3 + 4". If there are multiple operations, the operator is given immediately after its second operand; so the expression written "3 − 4 + 5" in conventional infix notation would be written "3 4 − 5 +" in RPN: first subtract 4 from 3, then add 5 to that. An advantage of RPN is that it obviates the need for parentheses that are required by infix. While "3 − 4 * 5" can also be written "3 − (4 * 5)", that means something quite different from "(3 − 4) * 5". In postfix, the former would be written "3 4 5 * −", which unambiguously means "3 (4 5 *) −".
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Belial wrote:A misunderstanding? On the internet??!!? Say it ain't so, Superman!!!
Pseudonym wrote:Assuming we know everything is sheer arrogance, but assuming we know nothing is sheer absurdity.
Nasaniaru wrote:I wish for more high-brow jokes like this as it actually gives me a chance to learn something that I didn't know.
RogerMurdock wrote:http://en.wikipedia.org/wiki/Reverse_Polish_notation
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