Can anyone tell what is the time complexity of this program

Question

#include<stdio.h>
Int main()
{
Int a[10];
Int I, j, nsum=0;
For(i =0; i<n; i++)
{
Scanf("%d",&a[i]);
}
For(j=0;j<n;j++)
{
Sum=sum+a[i];
}
Printf ("%d",sum);
Return 0;
}

Answer 1

It looks deceptively like O(n), doesn't it, Jay Matthews? But a is limited to 10 entries. So, n, which is undeclared, can at most be 10. Which makes it O(1), else undefined and most likely crashing. But since n and sum are undeclared, and this program thus won't even compile, the complexity is ... what? ... O(0)?

I think it is safe to say that the question cannot be answered unless a working program is presented.