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Short-Circuit Problem

 
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||(short circuit OR) don't bother to check the second OR if the first one is true while (|) bitwize OR does.
 
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As you said thats the short-circuit problem
In the first case, ++z>5 evaluates to true, so the ++z>6 will not be evaluated(because '||' is a short-circuit operator)
where as in the second case, even when the first operand evaluates to true ++z>6 will be executed giving the output as 8
 
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