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  1. PO
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    <p>This expression is OK because the <a href="http://en.wikipedia.org/wiki/Comma_operator" rel="nofollow noreferrer">comma operator</a> is a <a href="http://en.wikipedia.org/wiki/Sequence_point" rel="nofollow noreferrer">sequence point</a>:</p> <pre><code>(i++, ++i, j*i) </code></pre> <p>However do not confuse it with the following where the comma is not acting as a sequence point:</p> <pre><code>somefunction(i++, ++i, j*i) </code></pre> <hr> <blockquote> <p>What about j = i++ * ++i </p> </blockquote> <p>The multiplication operator is not a sequence point.</p> <hr> <p>(<em>Excuse me hijacking your answer</em>)</p> <p>From §3.4 of ISO 9899:1999 (C Standard):</p> <blockquote> <h3>3.4 behavior</h3> <p>external appearance or action</p> <h3>3.4.1 implementation-defined behavior</h3> <p>unspecified behavior where each implementation documents how the choice is made</p> <p>EXAMPLE An example of implementation-defined behavior is the propagation of the high-order bit when a signed integer is shifted right.</p> <h3>3.4.2 locale-specific behavior</h3> <p>behavior that depends on local conventions of nationality, culture, and language that each implementation documents</p> <p>EXAMPLE An example of locale-specific behavior is whether the islower function returns true for characters other than the 26 lowercase Latin letters.</p> <h3>3.4.3 undefined behavior</h3> <p>behavior, upon use of a nonportable or erroneous program construct or of erroneous data, for which this International Standard imposes no requirements</p> <p>NOTE Possible undefined behavior ranges from ignoring the situation completely with unpredictable results, to behaving during translation or program execution in a documented manner characteristic of the environment (with or without the issuance of a diagnostic message), to terminating a translation or execution (with the issuance of a diagnostic message).</p> <p>EXAMPLE An example of undefined behavior is the behavior on integer overflow.</p> <h3>3.4.4 unspecified behavior</h3> <p>behavior where this International Standard provides two or more possibilities and imposes no further requirements on which is chosen in any instance</p> <p>EXAMPLE An example of unspecified behavior is the order in which the arguments to a function are evaluated.</p> </blockquote>
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    1. POIs this program having any sequence point issues?
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    1. USJonathan Leffler
    1. USMark Byers
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    1. POIs this program having any sequence point issues?
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    1. COYes ! order of evaluation is implementation dependent.
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      1. USJagan
    2. CO@Jagan, I think it's actually undefined behaviour.
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      1. USMark Byers
    3. COunspecified , undefined and implementation dependent.These terms are very dangerous.I use them interchangeably (i should not do).I feel better if you explain these words.
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