#include <stdio.h> int main() { int num = 10; // Original integer variable int *ptr1 = &num; // Pointer to int int **ptr2 = &ptr1; // Pointer to pointer int ***ptr3 = &ptr2; // Triple pointer printf("Original value: %dn", num); /* Modify via single pointer */ *ptr1 = 20; printf("After *ptr1 = 20: %dn", num); /* Modify via pointer-to-pointer */ **ptr2 = 30; printf("After **ptr2 = 30: %dn", num); /* Modify via triple pointer */ ***ptr3 = 40; printf("After ***ptr3 = 40: %dn", num); /* Access via different levels */ printf("nAccess values through pointers:n"); printf("*ptr1 = %dn", *ptr1); printf("**ptr2 = %dn", **ptr2); printf("***ptr3= %dn", ***ptr3); return 0; }