a) None
b) ++
c) —
d) ++ & —
Answer: b
Explanation: Due to the history of using integer values as booleans, if an integer is used as a boolean, then incrementing will mean that whatever its truth value before the operation, it will have a truth-value of true after it. However, it is not possible to predict the result of — given knowledge only of the truth value of x, as it could result in false
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