When are variable-length arrays legal?

Question

I\'m not a C++ expert, but as far as I know this code should fail due to size not being constant:

#include

using namespace std;         


        

Answer 1

Because you don't invoke g++ as a C++ compiler. If I try it, I get a warning, stating clearly that "ISO C++ forbids variable length array". But my makefiles include the option -std=c++98, at least when I want to compile portable C++.