談談malloc()和free()

// Code...char *Ptr = NULL;Ptr = (char *)malloc(100 * sizeof(char));if (NULL == Ptr){exit (1);}gets(Ptr);// code...free(Ptr);Ptr = NULL;// code...

void Function(void){    char *p = (char *)malloc(100 * sizeof(char));}

struct mem_control_block{    int is_available;    //這是一個標記？    int size;            //這是實際空間的大小};

void free(void *ptr){    struct mem_control_block *free;    free = ptr - sizeof(struct mem_control_block);    free->is_available = 1;    return;}