#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>

/*
   ∙ &▒ means address of ▒
   ∙ *▒ means value at ▒  (which should be an address)
   ∙ *▒ = ░  means store ░ at ▒  (▒ should be an address)
   ∙ When you declare a variable like this…
     ▒▒▒* ░ = …
     The type of the variable will be "address of a ▒▒▒".
   ∙ One way to print an address from your program is to use
     printf("%p", (void*) ▒);
   ∙ The (void*) typecasts ▒ to an address of anything.
*/

int main(int argc, char* argv[]) {
    int    n = 5;
    int* a_n = &n;


    printf("Address of n is %p.\n", (void*) a_n);


    printf("Value at %p is %d\n", (void*) a_n, *a_n);


    // What would happen if we didn't use the *?
    // *a_n = 7;    // GOOD
    // a_n = 7;     // BAD:  assigns an int to an int*.
    a_n = (int*)7;  // TERRIBLE:  This tells gcc not to warn you about your mistake.  Expect pain!!!

    printf("Value at %p is %d\n", (void*) a_n, *a_n);

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */