[amibroker] looping question

[zeek ing]

Hello all
I am trying to understand loops more clearly. I have a question on some code
that i  have been studying maybe someone can help:
If I have a loop


for( i = 0; i < BarCount; i++ )
{
  condition .....

    {


        for (j = i + 1; j < BarCount; j++)
        {  ........      .....


                   i = j;
                break;
        }
}


I am trying to understand this loop construct.
a) why would i set J to i+1? why not have j=i?
b) what does i=j accomplish??


if anyone can clarify that would be great, I have seen this loop construct a
few times b4.


thanks
zeek