Strange memory allocation int a[atoi(argv[1])] ?!

[chimi]

Hello!

I've just heard that teachers from one of the university of technology say
that:

int a[atoi(argv[1])];

is correct way to dynamic allocation... what is more it looks like x =
a[999999]; works! o_O
but I run memusage test-prog 1000000 and it doesn't call *alloc nor free at
all, but works well...

in the other hand 
int a[32];
doesn't allow to acces its 1000000 element (it's ok of course)

I wanted to know what gcc does with atoi(argv[2])? Does it only OS allocate
so huge heap so it works?

Or do they wrong?

--
chmi
-- 
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