• C

multi-dimensional malloc/realloc

suppose I want an array like  array[?][8][32]
where I dont know how big the ? element needs to be
I find out somehow that ?=1000 so I have to malloc the array space.
Later I find out that 1000 was not big enough and it needs to be 5000 so I must realloc a larger chunck.

I dont know how to declare the array so that malloc works
nor do i know how to pass this to malloc, to say nothing of the realloc part of it.

Any suggestions would be helpfull
haggedk1Asked:
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noddyCommented:
Declare a pointer to the array as:-

type*** pArray=0;

To allocate it do:-

pArray=malloc(sieof(type)*8*32*x);

where x is your '?'

Then to reallocate it if your x grows:-
pArray=realloc(pArray, sizeof(type)*8*32*newx);

this will preserve the contents of the array if the array grows but pArray might be a different value.

And then use:-

pArray[x][y][z]=...;

to address an item in the array.

NB: malloc and realloc may return 0 if the request cannot be met by the OS.

NB2: if you are using DOS or Win16, beware of the segment limitation of 64K

to use the array.
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