a similar test program in a C++ IDE netted the exact same result.

In my experience, C and C++ compilers differ. Take the code:
int x = 0;
printf("%d %d %d\n",++x,++x,++x);

[download]
A similar line in Perl (allowing for syntax differences) gives 3 3 3, because of optimisation.
PHP give 1 2 3, and probably denotes a lack of same.
MS Visual Studio 6 C++ you get 3 3 3 when compliled in Release (again, optimisation) but (wait for it) 3 2 1 in Debug (no optimisation).
gcc (Windows and Linux) gives 1 2 3 regardless of the optimisation level.

Upshot of that? Don't do it!

In reply to Re: Pre vs Post Incrementing variables by cdarke
in thread Pre vs Post Incrementing variables by SavannahLion

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