Question

I need to alloc a large multidimensional-array as char a[x][32][y], and x*32*y is about 6~12G. (x, y are detenmined at runtime.)

I think out a way that is to do char *a=malloc(x*32*y), and use *(a+32*y*i+y*j+k) for a[i][j][k].

However, this looks not so convient comparing to a[i][j][k].

Is there any better way ?

Added:
It is a[x][32][datlen], where datlen is detenmined at runtime and x is set considering the memory.

The whole data in the array will be new. And I have got mathines with 16 or 32GB memory to run it.

Answer 1

INCORRECT: You should still be able to use a[i][j][k] syntax when referencing dynamically allocated memory.

CORRECT: Use a macro to at least make the job easier

#define A(i,j,k) *(a+32*y*i+y*j+k)
A(1,2,3) would then do the right thing.