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copied!<p>It depends on the argument type, the called function's calling convention, the archtecture and the compiler. On an x86, the <a href="http://en.wikipedia.org/wiki/X86_calling_conventions#pascal" rel="noreferrer">Pascal</a> calling convention evaluates arguments left to right whereas in the C calling convention (<a href="http://msdn.microsoft.com/en-us/library/zkwh89ks(VS.80).aspx" rel="noreferrer">__cdecl</a>) it is right to left. Most programs which run on multiple platforms do take into account the calling conventions to skip surprises. </p> <p>There is a nice <a href="http://blogs.msdn.com/oldnewthing/archive/2004/01/08/48616.aspx" rel="noreferrer">article</a> on Raymond Chen' blog if you are interested. You may also want to take a look at the <a href="http://gcc.gnu.org/onlinedocs/gccint/Stack-and-Calling.html" rel="noreferrer">Stack and Calling</a> section of the GCC manual.</p> <p><strong>Edit:</strong> So long as we are splitting hairs: My answer treats this not as a language question but as a platform one. The language standard does not gurantee or prefer one over the other and leaves it as <strong>unspecified</strong>. Note the wording. It does not say this is undefined. Unspecified in this sense means something you cannot count on, non-portable behavior. I don't have the C spec/draft handy but it should be similar to that from my n2798 draft (C++) </p> <blockquote> <p>Certain other aspects and operations of the abstract machine are described in this International Standard as unspecified (for example, order of evaluation of arguments to a function). Where possible, this International Standard defines a set of allowable behaviors. These define the nondeterministic aspects of the abstract machine. An instance of the abstract machine can thus have more than one possible execution sequence for a given program and a given input.</p> </blockquote>

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