Program to understand pointer to pointer

#include<stdio.h>
#include<conio.h>
main( )
{
int a = 5;
int *pa;
int **ppa;
pa = &a;
ppa = &pa;
printf("Address of a = %p\n", &a);
printf("Value of pa = Address of a = %p\n", pa);
printf("Value of *pa = Value of a = %d\n", *pa);
printf("Address of pa = %p\n", &pa);
printf("Value of ppa = Address of pa = %p\n", ppa);
printf("Value of *ppa = Value of  pa = %p\n", *ppa);
printf("Value of **ppa = Value of a = %d\n", **ppa);
printf("Address of ppa = %p\n", &ppa);
getch();
}