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

// ∙ A memory address is just a number.
// ∙ When you print a memory address using printf(…), the format code is "%p" and
//   you must typecast the address to void*.
// ∙ void* just means an address of anything.
//   - int* means an address of an int.

int main(int argc, char* argv[]) {
    int n = 5;  // n gets the value 5.
    printf("int n = 5;\n");
    printf("// n   == %d\n", n);
    printf("//\n");

    int* a_n = &n;  // a_n is declared as an address of an int.
                    // a_n is initialized to the address of n.
    printf("int* a_n = &n;\n");
    printf("// a_n == %p\n", (void*)a_n);
    printf("//\n");

    int n2 = *a_n;   // n2 is declared as an int.
                     // n2 is initialized to the value at a_n.
    printf("int n2 = *a_n;\n");
    printf("// n2  == %d\n", n2);
    printf("//\n");

    *a_n = 7;        // Write the value 7 at address a_n.
    printf("*a_n = 7;\n");
    printf("// n   == %d\n", n);
    printf("// n2  == %d\n", n2);

    return EXIT_SUCCESS;
}
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