In reply to naveensv:
A left-associative operator, like subtraction, groups the leftmost elements first. A right-associative operator, like exponentiation, groups the rightmost elements first. An operator is non-associative when it doesn’t make sense to use in succession
The associativity indicates in what order operators of equal precedence in an expression are applied; thus
// and operator has a left associativity
(a and b and c and d) are left associated as
( ( ( (a and b) and c) and d)).
Ben Cohen
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