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

int main(int argc, char* argv[]) {
    int* a_n = malloc( sizeof *a_n );
    // Allocate a buffer on the heap sufficient to hold an int (i.e., object of the same
    // size as *a_n), and assign the address of that buffer to a_n.

    *a_n = 5;   // Write 5 at address a_n.
    printf("*a_n == %d\n", *a_n); // Print the value at address a_n.
    
    free(a_n);  // no asterisk because this is just the adddress of the buffer to free.
    // Free (deallocate) the buffer that begins at address a_n.

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