Recursion Help C

Question

Does the increment of variable n changes her value in the next step? Are we calling the function for(brojevi[0]) or brojevi[1]? We have solved this in school without changing the value and I am confused how is it working?

Int test3(int brojevi, int n, int s)
{
If(n==4)
return s;
else
return test3(brojevi, ++n, s*=(brojevi+n));
}
int main()
{
int a[ ]={1,3,4,5};
int n=0;
printf("%d", test3(a,n,1));
}

Answer 1

The behaviour changes depending on the compiler, or even between versions of the same compiler and because of that code like this should be avoided.
Compiler a would use brojevi[0] while compiler b would use brojevi[1].

Your code could work correctly 1 day and break the next just because you upgraded your compiler.