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    <p>Here's an excellent reason <em>not</em> to do this. The following program prints "This will appear".</p> <pre><code>#include &lt;iostream&gt; int main() { std::cout &lt;&lt; "This " // A comment ... \ &lt;&lt; "will appear" // Another comment ... \ &lt;&lt; ", but this won't" &lt;&lt; std::endl; } </code></pre> <p>Why? Because the first <code>\</code> is followed by a blank, and so it's just part of the comment, <em>not</em> a line-splicing character. The program's behavior can quietly and significantly change due to invisible trailing white space.</p> <p>An even better reason not to do this: g++ gets it wrong, even with <code>-pedantic</code>. When I compile this program using g++ the output is just "This"; the trailing white space after the first <code>\</code> is ignored. In my opinion this is how it <em>should</em> work, but it's not what the language standard says. (Line splicing happens in translation phase 2. I suppose one might argue that the trailing blanks could be deleted in phase 1, but I'm not convinced that that's a valid argument -- and I don't know whether the gcc authors have actually made that argument.) In any case, g++ 4.5.2 and Sun CC version 5.5 disagree with each other.</p> <p>If you want multi-line comments, either use <code>/* ... */</code>, or insert a <code>//</code> at the beginning of each line. I prefer the latter, because it's much easier to tell that a given line is part of the comment. (Actually it's multiple single-line comments.) Any decent editor should let you do this without typing <code>//</code> N times for N lines. Or, if you're commenting out a block of code, use <code>#if 0 ... #endif</code>.</p>
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    1. COmoreover some IDEs (like Eclipse, as I just tested) simply trims the trailing space as you save the source file
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