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&&
    Logical conjunction:  The logical AND of the value on the left and the
    value on the right is produced.  If either of the values on the left or
    right is equal to 0 then the result is 0; otherwise the result is 1.

||
    Logical inclusive disjunction:  The logical OR of the value on the left
    and the value on the right is produced.  If either of the values on the
    left or right is not equal to 0 then the result is 1; otherwise the
    result is 0.  If the value on the left is not equal to 0 then the
    expression on the right is not evaluated (this is known as short-circuit
    expression evaluation).