Talk:Infix notation

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Note that these rules are still ambiguous...

Is

1 - 2 - 3

equal to

1 - (2 - 3) = 2

or

(1 - 2) - 3 = -4

?

The convention is either to evaluate left to right or right to left, but I don't recall which. Salsa Shark 08:30 Mar 20, 2003 (UTC)
..only if you're illiterate. The former distributes the sign to other signs, which isn't at all told by the first expression. lysdexia 09:54, 24 Oct 2004 (UTC)
Wow, stupidity. Salsa Shark, did you pass junior school math.? When expanded, the first option becomes 1 - 2 + 3. To get the originial expression, you need to use 1 - \left(2 + 3\right). if you understand that a number without a sign is considered to be positive, then the expression could be re-written as 0 + \left( { + 1} \right) + \left( { - 2} \right) + \left( { - 3} \right). the order which the later terms are operated is irrelevant in this caae, since hey are of equal precedence. In general, however, it is normal to evaluate terms from left to right