#include <stdio.h>

/* Note: Generally, having global variables is a bad design.  They're used here
   to be visible in printValues (without have to pass them in each time) */
int number = -1;
int* intPtr1;
int* intPtr2;

void printValues(char* header){
    printf("\n");
    printf("%s", header);
    printf( "---------------------------------\n");
    printf( "&number:  %p,  number:  %d\n",  &number, number);

    printf("&intPtr1: %p,  intPtr1: %p, *intPtr1: ", &intPtr1, intPtr1);
    if( intPtr1 != NULL ){
        printf ("%d\n", *intPtr1);
    }else{
        printf ("(N/A) - NULL pointer\n");
    }
     
    printf("&intPtr2: %p,  intPtr2: %p, *intPtr2: ", &intPtr2, intPtr2);
    if( intPtr2 != NULL ){
        printf ("%d\n", *intPtr2);
    }else{
        printf ("(N/A) - NULL pointer\n");
    }
}

int main(){

    printValues("Initial\n");

    printValues("1) After making intPtr1 point to number\n");

    printValues("2) After assigning 3 to the variable that intPtr1 is pointing to (using intPtr1)\n");

    printValues("3) After making intPtr1 point to a newly allocated int\n");

    printValues("4) After assigning that new int to 7\n");

    printValues("5) After copying the address stored in intPtr1 to intPtr2\n");

    printValues("6) After making intPtr2 point to a newly allocated int\n");

    printValues("7) After assigning that new int to 1\n");

    printValues("8) After freeing up the allocated memory and set both pointers to NULL\n");
     
    return 0;
}