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

int main(int argc, char* argv[]) {
    int n = 6;
    int* a_n = &n;

    *a_n = 81;

    printf("My integer is %d stored at %p\n", *a_n, (void*)a_n);

    // invalid: a_n is stack allocated
    free(a_n);

    char* str = "Hello";
    // invalid: str is data allocated
    free(str);

    // pitfall 4: only use free on heap allocated variables

    return EXIT_SUCCESS;
}
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