Evaluation of an expression may produce side effects. At specific points during execution called sequence points, all side effects of previous evaluations have completed and no side effects of subsequent evaluations have yet taken place.
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According to sectionC99 Section 6.5 of \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] (see also [undefined behavior 32 | CC. Undefined Behavior#ub_32] of Annex J): |
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