How many times this loop will execute? Explain pls

Question

int p =2;
for (int q = 2; q<32;q=q*2)
{
while (p<q)
{
p=p*2;
}
q=p-q;
}

Answer 1

I don't completely understand what this code actually does. Anyways, here is it's execution.

BEGIN
Iteration 1 : q = 2-2 = 0 & q = 0*2 = 0
Iteration 2 : q = 2-0 = 2 & q = 2*2 = 4
Iteration 3 : p = 2*2 = 4 & q = 4-4 = 0 & q = 0*2 = 0
Iteration 4 : q = 4 & q = 8
Iteration 5 : p = 8 & q = 0 & q = 0
Iteration 6 : q = 8 & q = 16
Iteration 7 : p = 16 & q = 0 & q = 0
Iteration 8 : q = 16 & q = 32
END