/*  */
#include <stdio.h>
#include <math.h>


int main (void)
{
    int i = 3;
    printf("i = %i\n",i);
    printf("The memory address of i is %p\n",&i);
    /*note the use of %p to print the address */
    
    /* declaration of pointer variables */
    long *ptr;
    /*ptr is a variable that can contain addresses of long int variables */
    long int j = 56;
    ptr = &j;
    /* assign the address of j to ptr */
    printf("j = %i, its address is %p, ptr = %p\n",j,&j,ptr);
    
    /*dereferncing pointers */
    printf("The value of the variable pointed to by ptr is %i\n",*ptr);
    
    /* initialising pointers */
    int k = 97;
    int *ptr_to_k = &k;
    /* point ptr_to_k to the address of k */
    printf("ptr_to_k has address %p dereferenced to %i\n",ptr_to_k,*ptr_to_k);
}