Precedence of Logical Operators

Operator	precedence
!	High
&&	Medium
||	Low

You have seen that when expressions mix
&& and ||
that evaluation must be
done in the correct order.
Parentheses can be used to group operands with their correct operator,
just like in arithmetic.
Also like arithmetic operators, logical operators have precedence that
determines how things are grouped in the absence of parentheses.

In an expression,
the operator with the highest precedence is grouped with its
operand(s) first,
then the next highest operator will be grouped with its operands,
and so on.
If there are several logical operators of the same precedence, they
will be examined left to right.

For example, say that A, B, C, and D stand for relational expressions
(things like 23 > 90).
Then,

A || B && C	means	A || (B && C)
A && B || C && D	means	(A && B) || (C && D)
A && B && C || D	means	((A && B) && C) || D
!A && B || C	means	((!A) && B) || C

It is common for programmers to use parentheses to group operands together
rather than rely on logical operator precedence rules.