Question

I have a following sample code from my lecture note.

int[] a = new int[3]; 
a[0] = 1;
for (int i = 1; i < a.length; i++) {    
    a[i] = a[i-1] + i;
}

And I am assuming that this will return

[1,2,3] 

after running the following code.

Because the loop starts from 1 and counts up to 3. when the first loop gets executed i is assinged as 1 and [1-1]+1 and the result is 1 and next i becomes 2 and result is 2.....

I did not think a[0]=1; was doing anything much.
But I am not sure if that is correct.

Could and one tell me if my assumption is correct, please?

Answer 1

Well, not exactly:

i   |   a[i-1]    | a[i] = a[i-1] + i
----+-------------+------------------
1   |  a[0] = 1   | a[1] = 1 + 1 = 2
2   |  a[1] = 2   | a[2] = 2 + 2 = 4