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    <p>When a sequence point occurs, it basically means that you are guaranteed that all previous operations are complete.</p> <p>Changing a variable twice without an intervening sequence point is one example of undefined behaviour.</p> <p>For example, <code>i = i++;</code> is undefined because there's no sequence point between the two changes to <code>i</code>.</p> <p>Wikipedia has a <a href="http://en.wikipedia.org/wiki/Sequence_point" rel="noreferrer">list of the sequence points</a> in the C and C++ standards although the definitive list should always be taken from the ISO standard. From C99 appendix C:</p> <hr> <p>The following are the sequence points described in 5.1.2.3:</p> <ul> <li>The call to a function, after the arguments have been evaluated (6.5.2.2).</li> <li>The end of the first operand of the following operators: logical AND &amp;&amp; (6.5.13); logical OR || (6.5.14); conditional ? (6.5.15); comma , (6.5.17).</li> <li>The end of a full declarator: declarators (6.7.5);</li> <li>The end of a full expression: an initializer (6.7.8); the expression in an expression statement (6.8.3); the controlling expression of a selection statement (if or switch) (6.8.4); the controlling expression of a while or do statement (6.8.5); each of the expressions of a for statement (6.8.5.3); the expression in a return statement (6.8.6.4).</li> <li>Immediately before a library function returns (7.1.4).</li> <li>After the actions associated with each formatted input/output function conversion specifier (7.19.6, 7.24.2).</li> <li>Immediately before and immediately after each call to a comparison function, and also between any call to a comparison function and any movement of the objects passed as arguments to that call (7.20.5).</li> </ul> <hr> <p>C11 has the wording changed. It appears to have broken out the ternary operator and added some more detail:</p> <hr> <p>The following are the sequence points described in 5.1.2.3:</p> <ul> <li>Between the evaluations of the function designator and actual arguments in a function call and the actual call. (6.5.2.2).</li> <li>Between the evaluations of the first and second operands of the following operators: logical AND &amp;&amp; (6.5.13); logical OR || (6.5.14); comma , (6.5.17).</li> <li>Between the evaluations of the first operand of the conditional ?: operator and whichever of the second and third operands is evaluated (6.5.15).</li> <li>The end of a full declarator: declarators (6.7.6);</li> <li>Between the evaluation of a full expression and the next full expression to be evaluated. The following are full expressions: an initializer (6.7.9); the expression in an expression statement (6.8.3); the controlling expression of a selection statement (if or switch) (6.8.4); the controlling expression of a while or do statement (6.8.5); each of the expressions of a for statement (6.8.5.3); the expression in a return statement (6.8.6.4).</li> <li>Immediately before a library function returns (7.1.4).</li> <li>After the actions associated with each formatted input/output function conversion specifier (7.21.6, 7.28.2).</li> <li>Immediately before and immediately after each call to a comparison function, and also between any call to a comparison function and any movement of the objects passed as arguments to that call (7.22.5).</li> </ul>
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    1. POsequence points in c
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    1. COI am expecting more information from you pax.I have basic knowledge in c.You gave very good explanation to my previous question.
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    2. COWoah, 100k rep! Congratulations.
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    3. COIt is also undefined behavior to modify the value of a variable and also use the value in any way other than to determine the value to be stored without an intervening sequence point. For example, a[i++] = i is undefined because, although it only modifies the value of i once, the value of i is used for a purpose other than to determine what value to store into i.
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      1. USRobert Gamble
 

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