Allocates a 3D array in C and populates it with random numbers. You can use the notation A[i][j][k] to access its elements

array3d.c

/*
Example demonstrating how to allocate and use a multdimensional 
array.
*/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>


// Method to allocate a 2D array of floats
float*** make_3d_array(int nx, int ny, int nz) {
	float*** arr;
	int i,j;

	arr = (float ***) malloc(nx*sizeof(float**));

	for (i = 0; i < nx; i++) {
		arr[i] = (float **) malloc(ny*sizeof(float*));

        for(j = 0; j < ny; j++) {
        	arr[i][j] = (float *) malloc(nz * sizeof(float));
        }
    }

	return arr;
} 



int main(int argc, char *argv[])
{
	int i, j, k;
	size_t N1=10,N2=20,N3=5;

	// allocates 3D array
	float ***ran = make_3d_array(N1, N2, N3);

	// initialize pseudo-random number generator
    srand(time(NULL)); 

	// populates the array with random numbers
    for (i = 0; i < N1; i++){
    	for (j=0; j<N2; j++) {
    		for (k=0; k<N3; k++) {
    			ran[i][j][k] = ((float)rand()/(float)(RAND_MAX));
    		}
    	}
   }

	// prints values
	for (i=0; i<N1; i++) {
		for (j=0; j<N2; j++) {
			for (k=0; k<N3; k++) {
				printf("A[%d][%d][%d] = %f \n", i,j,k,ran[i][j][k]);
			}
		}
	}

	free(ran);
}