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

#define log_int(n) printf("%s == %d\n", #n, (n))
#define log_long(n) printf("%s == %ld\n", #n, (n))
#define log_addr(n) printf("%s == %p\n", #n, (void*)(n))

int main(int argc, char* argv[]) {
    int num = 9;
    int* a_stack_num = &num;
    log_int(num);
    log_addr(a_stack_num);
    log_addr(&a_stack_num);
    log_int(*a_stack_num);

    // note that *a_heap_num works in this context
    // because we are using sizeof, sizeof only cares about the type
    // not whether its initialized or the data inside
    int* a_heap_num = malloc(sizeof(*a_heap_num));
    *a_heap_num = 5;
    log_addr(a_heap_num);
    log_int(*a_heap_num);
    free(a_heap_num);
    a_heap_num = NULL;

    // BAD malloc: using type instead of variable
    // this leads to potential issues if the type changes later
    //int* a_heap_num = malloc(sizeof(int));

    // REALLY BAD malloc: using a int constant for the size
    //int* a_heap_num = malloc(4);


    return EXIT_SUCCESS;
}
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