How can I work with dynamically-allocated arbitrary-dimensional arrays?

Question

The typical 1-D array can be statically or automatically allocated in a declaration.

enum { n=100 };
int arr1[n];

Or dynamically-allocated

Answer 1

If you define a as a pointer to an array of n integers, the compiler will do the index arithmetic.

#define N 7
int (*a)[N];

int main() {
  a = malloc(N*N*sizeof(int));
  a[2][3] = 0;
}

ADDED:

Similarly, a three dimensional example:

#include 
#include 

#define N 7

int (*a)[N][N];

int main() {
    int i,j,k;
    a = malloc(N*N*N*sizeof(int));
    for(i=0; i