C 1D Array as 2D Subarrays by Pointers

#include <stdio.h>

int main (void) {

    int a[] = {1,5,-3},
        *p = a,
        (*pos)[2] = (int(*)[2])p;

    printf ("{% d, % d}\n{% d,  x}\n", pos[0][0], pos[0][1], pos[1][0]);

    // printf("%d \n",(pos[1][1]));     /* Undefined Behavior */
}