187: Highlights

• If you want to combine two predicate expressions, and the result is to be 1 if the values of both expressions are other than 0, then use &&.
• If you want to combine two predicate expressions, and the result is to be 1 if the value of either expression is other than 0, then use ||.
• Both && and || evaluate their left operand before they evaluate their right operand. The right operand is not evaluated if the value of the left operand of an && expression is 0 or if the value of the left operand of a || expression is not 0.