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Message: [QUOTE="Barry Schwarz, post: 2386178"] Could someone please explain what section 6.5.16-4 means "The order of evaluation of the operands is unspecified. If an attempt is made to modify the result of an assignment operator or to access it after the next sequence point, the behavior is undefined." I understand the order of evaluation part. d = b*b-4*a*c; if (d>0) ... This is pretty common code and obviously not undefined behavior if the variables are properly defined and assigned values. But it seems that the if statement attempts to access the result of the previous assignment operator after the end of statement sequence point as described in the quote. What am I misinterpreting? <<Remove the del for email>> [/QUOTE]