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What’s the difference between the two code below.
int a[] = {0,0};
int a[2] = {0,0};
It seems I can assign value to a[3] in both cases. I can access a[3] in any case. So what’s the difference?
There is no difference. In the first one, the compiler does the counting for you, which is nice if you decide to change the number of elements later on.
The fact that your compiler forgives you for assigning to or using
a[3]doesn’t mean that doing so is correct. In fact, you can’t even accessa[2]since it only has two elements, indexed by subscripts 0 and 1.