/* Author: Jiri Zahradnik
 * Date 13. Nov 2014
 * Purpose: pointer logic demonstration
*/

#include <stdio.h>

int main(){
    int *i; /* here we have a pointer */
    /* pointer is just an arrow which points, through dereferencing (*) and referencing(&)
       we can get its adress(reference) or value stored at that adress(dereference)
    */
    i = malloc(sizeof(int));/* to store anything, we must allocate memory for value
                   malloc returns pointer(adress) of allocated memory
                */
    /* now we want to store a value in that memory, we use dereference(symbol: *), it means this:
        Program! I want to write THIS value in THIS memory pointed by pointer i
    */

    *i = 5;

    /* what we do NOT want to do, is modifying adress, so this:
        &i = 5;
       will change adress and not only we lose access to that memory block,
       we cause crash of that program
    */

    /* now we want to print adress of i */
    printf("%0xp\n", &i);
    /* now we want to print value of i */
    printf("%d\n", i);
    /* and now we want to free memory */
    free(i);

    return 0;
}