p is a pointer variable, holds address of b.
q is a pointer variable, holds address of a.
*p -> value at address pointed by p.
*q -> value at address pointed by q.
So *p = 5 and *q = 3
c = *p % *q which is 5%3 = 2
++(*p) increments the value of b
So b is 6 and *p also prints 6
