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Message: [QUOTE="hn.ft.pris, post: 2597431"] "Erik WikstrÃ¶m å†™é“ï¼š " Yes, I get it. But how to explain the following odd behavior of MS VS8: int main(int argc, char** argv){ #define L 1.234 #define T static_cast<int>(L) int arr[T]; arr[0] = 1; cout << arr[0] << endl; return 0; } Fine, without any warnings or errors. int main(int argc, char** argv){ double L = 1.234; int T = static_cast<int>(L); int arr[T]; arr[0] = 1; cout << arr[0] << endl; return 0; } error C2057: expected constant expression; error C2466: cannot allocate an array of constant size 0, on MS VS8 while gcc 3.4.2 approve it. [/QUOTE]