Does Grouping Matter?
lMathematically, + is an associative operator:
(a + b) + c == a + (b + c)
(a + b) + c == a + (b + c)
lHowever:
lThere are non-associative operators, such as -, where it does matter.
l(a - b) - c ?= a - (b - c)
lAlso, on computers, for floating point addition, associativity does not always
hold.