pointer to pointer code example

Example 1: pointers to pointers in cpp

#include <iostream>
 
using namespace std;
 
int main () {
   int  var;
   int  *ptr;
   int  **pptr;

   var = 3000;

   // take the address of var
   ptr = &var;

   // take the address of ptr using address of operator &
   pptr = &ptr;

   // take the value using pptr
   cout << "Value of var :" << var << endl;
   cout << "Value available at *ptr :" << *ptr << endl;
   cout << "Value available at **pptr :" << **pptr << endl;

   return 0;
}

Example 2: double pointers C++

#include <stdio.h>

int main(void)
{
    int value = 100;
    int *value_ptr = &value;
    int **value_double_ptr = &value_ptr;

    printf("Value: %d\n", value);
    printf("Pointer to value: %d\n", *value_ptr);
    printf("Double pointer to value: %d\n", **value_double_ptr);
}