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#include 
#include 

int nonHeapInt;

struct HeapObject
{
    int x;  // 因為如果找 x 的 pointer，實際上和找 HeapObject 的開頭 pointer 相同，
            // 所以我們必需加一個y，讓我們指定 pointer 時不會指到 HeapObject 的開頭。
    int y;
};

int main()
{
    struct HeapObject * heapObject = malloc(sizeof(struct HeapObject));

    nonHeapInt = 10;
    heapObject->y = 20;

    printf("Start nonHeapInt:%d\n", nonHeapInt);
    printf("Start heapObject->y:%d\n", heapObject->y);

    // free(&nonHeapInt); // GCC 會警告，執行 glibc 會丟 invalid pointer exception
    // free(&(heapObject->y)); // 雖然不會景告，但 glibc 還是會丟 invalid pointer exception

    printf("End nonHeapInt:%d\n", nonHeapInt);
    printf("End heapObject->y:%d\n", heapObject->y);

}