How do you dynamically allocate a contiguous 3D array in C?
- by Derek
In C, I want to loop through an array in this order
for(int z = 0; z < NZ; z++)
for(int x = 0; x < NX; x++)
for(int y = 0; y < NY; y++)
3Darray[x][y][z] = 100;
How do I create this array in such a way that 3Darray[0][1][0] comes right before 3Darray[0][2][0] in memory?
I can get an initialization to work that gives me "z-major" ordering, but I really want a y-major ordering for this 3d array
This is the code I have been trying to use:
char *space;
char ***Arr3D;
int y, z;
ptrdiff_t diff;
space = malloc(X_DIM * Y_DIM * Z_DIM * sizeof(char))
Arr3D = malloc(Z_DIM * sizeof(char **));
for (z = 0; z < Z_DIM; z++)
{
Arr3D[z] = malloc(Y_DIM * sizeof(char *));
for (y = 0; y < Y_DIM; y++)
{
Arr3D[z][y] = space + (z*(X_DIM * Y_DIM) + y*X_DIM);
}
}
