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

// okay to copy/adapt these two macros
#define log_int(n) printf("%s == %d\n", (#n), n)
#define log_addr(n) printf("%s == %p\n", (#n), (void*)n)

int main(int argc, char* argv[]) {
    // variable
    int n1 = 5;

    // & gets address of a variable
    int* a_n1 = &n1;
    //printf("a_n1 == %p\n", (void*)a_n1);
    log_addr(&n1);
    log_addr(a_n1);

    // get the value from the address a_n
    int n2 = *a_n1;
    log_int(n2);
    log_int(*a_n1);

    *a_n1 = 7;
    log_int(*a_n1);
    log_int(n1);
    log_int(n2);

    // this is probably counfusing with our naming conventons,
    // but is valid
    a_n1 = &n2;
    log_int(*a_n1);
    log_int(n1);

    // this is "valid", but almost never useful
    // in this case, causes a segfault
    //a_n1 = (int*)5; // good example of when *not* to use casts
    //log_int(*a_n1);

    return EXIT_SUCCESS;
}
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