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

int main(int argc, char* argv[]) {

    int n = 5;

    int* a_n = &n;  // Declare a variable 'a_n' of type int* ('address of int') and
                    // initialize it to &n ('address of n').
    
    printf("Value of n is %d.\n", n);
    printf("Address of n is %p.\n", (void*)a_n);
    // printf("%p", …) requires a void* typecast on the argument to "…%p…".
    // "%p" tells printf to print the argument in hexadecimal with 0x prefix.
    
    // Addresses are numbers!!!
    
    // This (below) is weird, for illustration of that fact (↑).
    unsigned long a_n_as_unsigned_long = (unsigned long)a_n;
    printf("Address of n is %ld.\n", a_n_as_unsigned_long);
    
    return EXIT_SUCCESS;
}
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