****p is nothing but a double pointer or pointer to pointer**
Double pointer is used to store the address of a pointer, (Considering that you are familiar with pointer concept, so not explaining about pointer)
What is Pointer to Pointer ?
Double (**) is used to denote the double Pointer
Pointer Stores the address of the Variable
Double Pointer Stores the address of the Pointer Variable
Declaration : Double Pointer
int **ptr2ptr;
Consider the Following Example :
int num = 45 , *ptr , **ptr2ptr ;
ptr = #
ptr2ptr = &ptr;
Now, When you print, then below will be the output.
num = 45
&num = 0xFF12FF (Random address)
ptr = 0xFF12FF (Address of num)
*ptr = 45 (Value of num)
&ptr = 0xAAAAAA (Random Address)
ptr2ptr = 0xAAAAAA (Address of ptr)
*ptr2ptr = 0xFF12FF (Value of ptr or address of num)
**ptr2ptr = 45 (Value of num)
Conceptually we can have Triple ….. n pointers
Example : *****n,****b can be another example
