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if you don't malloc
that's just a pointer
point to somewhere you don't know
like
char* ptr;
ptr is just a pointer
once you malloc it
ptr = malloc ....
噁 說 (上午 12:14):
ptr is a pointer which point to a memory space that you just allocated.
if you lose this memory address without saving it and free it
the allocated memory space will never be freed until your program ends
because you don't know where the memory space is
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