Large matricies

Hello.
I need to make a large matrix. somethign of size 1024 by 1024 and i need a couple of them. THe code works fine when i do thsi:

Code:

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int matrix[3][1024][1024];

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but when i make 3 arrays instead of a 3 dimensional array the program crashes.
ex:

Code:

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int matrix[1024][1024];
int matrx[1024][1024];
int matry[1024][1024];

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Any ideas how to circomvent this?
Thx

Allocate memory on the heap instead:

Code:

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int * matrix = new int[1024*1024];

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Or even better: use std::vector instead.

Or use global array. Or use vector (as a way of/instead of manually allocating memory).