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The evaluation of && and || expressions is complicated by the
fact that some subexpressions may not be evaluated at all.
In && expressions, the left-side operand is evaluated first: If the
value of the left-side operand is 0, the right-side operand is
ignored completely, and the value of the && expression is 0.
If both operands evaluate to some integer other than 0, the value of
the && expression is 1.
In || expressions, the left-side operand also is evaluated first: If
the left-side operand evaluates to some integer other than 0, the
right-side operand is ignored completely, and the value of the ||
expression is 1; if both operands evaluate to 0, the value of
the || expression is 0.