#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[]) {
    // address of a stack allocated int
    int n = 9;
    int* a_stack_num = &n;
    log_int(*a_stack_num);
    log_addr(a_stack_num);

    // use malloc to make a heal allocated int
    int* a_heap_num = malloc(sizeof(*a_heap_num));
    *a_heap_num = 10;
    log_int(*a_heap_num);
    log_addr(a_heap_num);


    free(a_heap_num);
    // for safety: make sure I do not accidently use
    // a_heap_num after I freed it
    a_heap_num = NULL;
    
    // BAD CODE QUALITY 1: malloc with type
    // if I change the type, malloc does not auto update
    //int* a_heap_num = malloc(sizeof(int));
    
    // BAD CODE QUALITY 2: constant type
    // always use sizeof, even if you know the size
    //int* a_heap_num = malloc(4);

    return EXIT_SUCCESS;
}
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